Next.js developer for improving an existing website

Budget: 6000 USD Deadline: 30 days

Dmitry, I will help you quickly understand the current Next.js project: I will conduct a technical review, assess the structure, code quality, and prioritize improvements. I have 7 years of experience in web development, including with TypeScript, SSR, and working with other people's codebases. I will separately check performance, mobile layout, forms, the admin panel, and integrations, and then propose a clear improvement plan. I am ready to discuss the details and start with the audit.

Budget: 500 USD Deadline: 10 days

Hello, Echocode Digital company
We have an experienced team with 8 years of expertise in creating turnkey websites, mobile applications, and complex web systems.
Over 8 years of practice, we have developed a deep technical stack.
You won't have to separately look for a designer, backend developer, and frontend developer. Our team works in a single unit, which eliminates misunderstandings between design and code, significantly speeds up development, and guarantees a quality result from one source
Freelancehunt
Write to us in private messages! We will discuss the details of your project, calculate the exact timelines and budget.

Budget: 6000 USD Deadline: 10 days

Hello! I work with the following stack — Next.js 15, React 19, TS, Tailwind, Redux Toolkit, Prisma, and I have integrated Stripe. I can come in, review the structure and SSR speed, and then fix and refine as we go. Can you tell me if the work is hourly or based on specific tasks? From that, I will estimate the format.

Budget: 900 USD Deadline: 21 days

I can start with a technical review of the existing Next.js project: check the structure of the App Router, separation of Server/Client Components, SSR and caching, TypeScript, forms and Zod, Redux, API integrations, authorization, mobile adaptation, performance, technical SEO, build, and deployment process. Based on the results, I will provide a list of issues with priorities, risks, and a clear plan for fixes.

Do I understand correctly that at the first stage, it is important for you to receive not a general code review, but to understand which issues are already affecting stability, speed, and further development, which changes can be made safely, and which require separate refactoring or a testing environment?

Timelines, cost of the review, and the format of further work will be discussed in private correspondence after reviewing the repository, project structure, package.json, Next.js configuration, deployment method, available logs, list of known issues, external integrations, and the presence of a staging environment.

Budget: 150 USD Deadline: 3 days

Good day! I develop in Python, have worked on similar projects with React/Node.js, and am ready to collaborate.

Budget: 100 USD Deadline: 1 day

Hello! I am a Strong Middle developer on Next.js, interested in long-term cooperation. I have over 5 years of experience. Feel free to contact me.

Budget: 5000 USD Deadline: 7 days

The first step of the audit: bundle-analyzer + Lighthouse for basic metrics, then prioritize based on the weight of issues. In Next.js 15, fetch() is not cached by default (no-store instead of force-cache from v14); if the project has migrated, pages may have quietly become fully dynamic. Prisma queries are not covered by fetch cache; for caching between requests, unstable_cache with explicit tags under revalidateTag is needed. Another common point: params and searchParams in App Router are now Promises; synchronous access gives a warning or breaks rendering. From which version of Next.js did the project start?

Budget: 6000 USD Deadline: 3 days

Good day.

The categories of web programming and JavaScript are indicated absolutely correctly. This is the ideal tech stack for your task.

I am ready to take your project for support and improvement. I have excellent practical experience working with Next.js 15, React 19, and TypeScript. I have a great understanding of the features of App Router and the logic of server-side rendering.

In the first stage, I will conduct a complete audit of the current architecture, assess the quality of the written code, and the operation of Redux Toolkit along with the Prisma database. After that, I will compile a detailed list of bottlenecks for optimizing page load speed and fixing errors.

I can quickly and carefully understand someone else's code. I will check the correct setup of JWT authorization, Stripe payments, and Mailgun email distributions without breaking the current functionality. I will definitely test the responsiveness of the interface on mobile devices and implement the necessary technical SEO adjustments.

Currently, my profile on this platform does not have any reviews yet. For me, this project is an excellent opportunity to demonstrate a high level of technical expertise, so I guarantee maximum involvement in the work and careful changes to the existing site.

I am waiting for access to the repository to begin the initial review. Expand

Budget: 400 USD Deadline: 5 days

Good day, Dmitriy!

The task is clear: we need not just a Next.js developer "for fixes," but a person who will carefully enter an already functioning project, quickly understand the architecture, and provide a clear technical picture — what has been done well, where the risks are, and what needs to be corrected first.

I can approach this in exactly that format.

At the first stage, I suggest:
— conducting a review of the project structure and key modules;
— checking the quality of implementation on Next.js 15 / React 19 / TypeScript;
— separately examining SSR, App Router, page loading, and performance bottlenecks;
— checking forms, the admin part, integrations, and potentially problematic areas in server logic;
— assessing mobile display and technical SEO aspects;
— preparing a list of priority changes: what is critical, what is desirable, and what can be done step by step.

It is important that I do not limit myself to a formal "audit for the sake of audit." If real technical problems are found during the review, I can immediately move on to targeted fixes and further development without unnecessary delays.

I work calmly and systematically with someone else's code: first, I analyze the current logic, dependencies, and risk points, then I propose clear solutions without unjustified rewrites. For an active website, this is especially important — changes must be careful, predictable, and without loss of stability.

If convenient, we can start with the technical review and priority list so that you immediately have a clear picture of the project and the next step.

🌐 My portfolio with recent cases:
https://mrnko.com

💼 Freelancehunt profile:
Freelancehunt

🤝 I would be happy to discuss the details, answer your questions, and offer the optimal solution for your project. Expand

Budget: 100 USD Deadline: 1 day

Hello!
I am ready to take on your project and will complete it urgently.
I have extensive experience with similar tasks, and there will be no difficulties.
If I have piqued your interest, feel free to write; I am happy to collaborate!

Budget: 108 USD Deadline: 3 days

Ready to connect to your Next.js project and help with improvements. I see the stack — Next.js, React, TypeScript, Tailwind, Prisma, and JWT/Stripe. This is a working set that I use every day.

I will understand the existing code without problems — App Router, server components, data structure in Prisma. I will refine the authorization logic via JWT and the payment flow in Stripe if there are any unresolved stages. I will organize the styles in Tailwind — it will be clean and responsive.

I work in stages: first, I look at what is there, agree on a plan for changes, and then make adjustments. This way, you see the process and control the outcome.

I am currently completely free — I can start today. Please write the key points for changes — and I will draft a plan of action.

Budget: 120 USD Deadline: 3 days

Working stack: Next.js 15 on App Router, React 19, TypeScript, Tailwind, Redux Toolkit, Zod, Prisma — I work with this constantly.

I suggest starting exactly as you described — with a technical audit. I will go through the repository and identify issues by layers: boundaries of server/client components and correctness of SSR, caching and revalidation in App Router, bundle size and loading waterfall (LCP/TTFB), forms and Zod schemas, server actions and integrations (Stripe, JWT, Google API), mobile layout, technical SEO (metadata, sitemap, robots, canonical). The output will be a prioritized list: critical / important / improvements, with an estimate of labor costs for each item. We will agree on further work based on this.

I work carefully with the live site: changes through separate branches and preview deploys, without risk to the working version.

Our live projects: guardlabs.online and guardlabs.online/portfolio/

The first stage (audit + prioritized report) — 120 USD, 3 days. I will estimate the volume of further refinements based on the results of the audit.

Budget: 50 USD Deadline: 3 days

Good day.
About us: viacore.group
Package: https://project-rework.packages.viacore.group/

Budget: 50 USD Deadline: 1 day

Hello.

I am a NodeJS developer. I have experience with Next.js. I am ready to take on the project. Write to me, and we will discuss.

Budget: 50 USD Deadline: 3 days

Hello, Dmitry! I am ready to join your project on Next.js.

I work with Next.js 15, React 19, and TypeScript, and I can easily understand other people's code — I grasp the nuances of App Router, SSR/RSC, and server actions. From your stack, I am familiar with Prisma, JWT authorization, Stripe, and integrations through Google APIs / Mailgun.

I suggest starting exactly with the first stage, as you described: conducting a technical review of the project and providing a prioritized list of changes — what is critical (bugs, form and authorization security), what affects performance (unnecessary re-renders, non-optimal queries, hydration), and what should be improved in terms of code quality and SEO. For each point — a clear explanation of the problem and a proposed solution, not just "rewrite."

One question to assess more accurately: where is the site currently deployed — Vercel or Netlify, and will I have access to the repository and staging environment for the review? This will determine whether I can check changes without risking the live site.

I am ready to show examples of live working projects right in the correspondence. For the first stage — technical review + priority list in 3 days; further ongoing development will be assessed based on the results of the review.

Petr Pankov, BotCraft Group Expand

Budget: 15000 USD Deadline: 5 days

For the first stage, we can start with a review in 5 working days, budget - 15,000 UAH. Here, it is important not just to have a list of comments, but the order of changes - what to fix before the release, what can be postponed, where there is a risk for speed, SSR, forms, admin panels, and integrations.

Regarding Next.js 15, React 19, TypeScript, and App Router, the work is specialized. I would start with a review of the repository, assembly, routes, server components, Zod schemas, Redux Toolkit state, forms, authorization, payments, and deployment. After the review, we will provide a prioritized list of corrections with estimates, and then we can proceed with tasks iteratively, without making abrupt changes to the existing site.

> Please clarify if there is access to the repository, Vercel or Netlify logs, and the list of current errors.
> Are there already speed measurements - Lighthouse, Web Vitals, Sentry, or analogs?

Similar cases by Ingello:
> https://business.ingello.com/forma-crm - admin panels, roles, processes, and support for a live system
> https://business.ingello.com/platforma - product platform with architecture and development
> https://business.ingello.com/carveli - a similar story with the site, integrations, and commercial logic

Main FLH landing - https://systems-fl.ingello.com

Overall, it's fine =) It's better to start with a review because one day of architectural insight often saves a week of chaotic corrections. More precisely, not always, but here the stack and the list of tasks are just about that. Expand

Budget: 100 USD Deadline: 7 days

Hello! I am ready to join the project, understand the current architecture, and conduct a technical review of the existing website.

I work with Next.js, React, TypeScript, and Tailwind CSS, familiar with App Router, SSR, Server Components, forms, validation through Zod, state management through Redux Toolkit, and external integrations. I can understand someone else's code and carefully make changes to an already functioning project without disrupting existing functionality. Examples of my work can be seen in my portfolio or on my portfolio website: https://my-portfolio-site-liart-xi.vercel.app/

In the first stage, I can:

— study the project structure and the dependencies used;
— check the architecture and code quality;
— identify errors, duplication, and potentially problematic areas;
— evaluate SSR, the operation of client and server components;
— check performance and page load speed;
— conduct an audit of mobile adaptation;
— check forms, authorization, the administrative part, and API integrations;
— assess technical SEO;
— compile a clear list of issues with priorities and recommendations.

After the audit, I will provide a report in which I will categorize tasks into critical, important, and desirable, as well as suggest the order of their correction. I can immediately fix the identified issues and continue to support the project on an ongoing basis.

To start, I will need access to the repository, information about the current hosting, and a brief description of known issues. Also, please clarify whether there is a testing environment or if all changes are currently being tested directly on the live site. Expand

Budget: 1300 USD Deadline: 15 days

Hi hope you are doing well

I can review your existing Next.js 15 project, understand the current architecture, identify technical issues, and help improve the website without disrupting the live system.

My first step would be a structured audit covering code quality, App Router usage, SSR, data fetching, TypeScript safety, Redux state flow, Zod validation, forms, admin features, integrations, mobile responsiveness, performance, and technical SEO.

I will then provide a clear list of findings grouped by priority, including critical bugs, performance risks, maintainability issues, and recommended improvements.

I can also fix identified problems, improve page speed, optimize rendering, review Prisma and JWT logic, check Stripe, Mailgun, Google APIs, and serverless functions, and support ongoing development afterward.

I am comfortable working inside existing codebases and explaining each issue and solution clearly.

Best regards, Youssef. Expand

Budget: 300 USD Deadline: 3 days

Good day, Dmitry.

I have reviewed your website and the task. I already have some improvements that I can suggest.

I regularly work on projects with Next.js, so I will quickly immerse myself in the current architecture and codebase. I have practical experience in auditing and refactoring existing projects, optimizing SSR and loading speed, working with Prisma, JWT, integrating and optimizing API and server functions, and technical SEO.

I will evaluate the architecture and code quality, identify performance bottlenecks, check the operation of SSR, hydration, and behavior on mobile devices, and prepare a list of priority fixes.

After the audit, I am ready to support and develop the project.
Feel free to write, and we can discuss collaboration in more detail.

Budget: 1100 USD Deadline: 29 days

Доброго дня!

Мені зацікавив ваш проєкт. Маю досвід розробки та супроводу проєктів на Next.js, React і TypeScript, а також роботи з існуючими кодовими базами, де важливо не лише реалізовувати новий функціонал, а й покращувати архітектуру, продуктивність та стабільність проєкту.

Добре знайомий з Next.js App Router, SSR, Server Components, оптимізацією завантаження сторінок, Redux Toolkit, Tailwind CSS, Zod та сучасними підходами до розробки. Також маю досвід інтеграції сторонніх сервісів, роботи з авторизацією, формами, API та технічним SEO.

На першому етапі можу:
* провести повний аудит проєкту;
* оцінити архітектуру та якість коду;
* виявити вузькі місця щодо продуктивності та SSR;
* перевірити адаптивність та коректність роботи на різних пристроях;
* підготувати перелік пріоритетних завдань із рекомендаціями щодо їх реалізації.

Після аудиту готовий займатися виправленням помилок, розвитком функціоналу та довгостроковою технічною підтримкою проєкту.

Працюю обережно з існуючим кодом, дотримуюся прийнятого стилю проєкту, документую важливі зміни та завжди пропоную рішення, які будуть зручними для подальшого розвитку продукту.

Буду радий ознайомитися з проєктом та обговорити подальшу співпрацю. Expand

Budget: 1000 USD Deadline: 30 days

Ready for new challenges and collaboration! My years of experience in software development began in 2015, and since then I have gained deep knowledge by working on various projects for international companies and local businesses.
Technologies:
PHP (Laravel, Yii1/2, Symfony, CodeIgniter), JavaScript (ReactJs, Angular, VueJs/Nuxt, NodeJS), MySQL, Postgres, AWS, Docker.

I provide continuous technical support and have experience working with global film studios and media companies such as Disney and Paramount, which confirms the high level of my expertise.

My skills allow me to create and maintain various solutions — from online stores, landing pages, and CRM/ERP systems to analytical platforms and business process automation systems. Additionally, I have been involved in implementing artificial intelligence and cutting-edge technologies to create innovative products and future business development.

My works:
https://guidetoiceland.is/ https://adsmanager.paramount.com/
https://www.disneycampaignmanager.com/
https://brillday.com/
https://nextel.cloud/ Expand

Budget: 500 USD Deadline: 7 days

Hi,

Before adding more, I’d check whether the current setup is solid.

Otherwise, new features can pile onto problems already sitting underneath.

Happy to chat.

Budget: 8000 USD Deadline: 4 days

Good day. I work with Next.js, React, and TypeScript on my own full-stack AI projects. I can start with a technical review: checking the structure, critical issues, SSR/App Router, performance, mobile version, and integrations. As a result, I will provide a prioritized list of changes with an explanation of the risks and can immediately implement the first fixes. I maintain a clear process in my work: a brief audit, agreement on priorities, and checking the results after each change.

Budget: 800 USD Deadline: 15 days

Hello, I would like to try myself in your project, my business card is https://prissetik.website/en. The stack you specified fits perfectly, but there are newer versions of next.js, and version 15 has vulnerabilities, so I would not recommend using it.

Budget: 700 USD Deadline: 5 days

😀 Hello!
✅ I will perform quality work 👌
✅ I have done similar work — frontend/web on Next.js (React), enhancements and fixes 🎯
🛠 How I will do it: I will take the repository, understand the current code, implement the necessary enhancements/fixes, ensure responsiveness and speed; I will check everything before submission
🎥 Portfolio: Freelancehunt
✅ Feel free to contact me, I will take a look at the site and clarify the scope 👌🙂

Budget: 100 USD Deadline: 1 day

Good afternoon, let's conduct an audit of the website, both in terms of code and UX. I will outline everything I have and discuss the next steps. The described stack is my main one, so understanding the project's issues will not be a problem. The price for the audit is 100, and it will take a couple of days.

Budget: 200 USD Deadline: 1 day

Good day
I am ready to conduct a website audit with further collaboration.
I charge $17 per hour.
Message me privately, and we will discuss the details.

Budget: 300 USD Deadline: 7 days

Hello,

I can review your existing Next.js 15 project, understand the current architecture, audit code quality, and identify the most important technical issues.

I have strong experience with Next.js, React, TypeScript, SSR, App Router, Redux Toolkit, Tailwind CSS, APIs, authentication, payments, and third-party integrations.

My first step would be to audit the project structure, performance, mobile responsiveness, SEO, forms, admin functionality, and external integrations. After that, I can provide a clear list of priority fixes and continue with ongoing improvements and new features.

I am comfortable working with existing codebases and can carefully improve the project without disrupting current functionality.

Da Pham Expand

Budget: 5490 USD Deadline: 29 days

Good day!
My name is Valentin, and I represent Arctic Web Agency. We are a team that specializes in creating modern and effective solutions for businesses. I can provide examples of our similar work in personal messages. We are ready to take your project to work!

Best regards,
Arctic Web Team
Freelancehunt

Budget: 5000 USD Deadline: 3 days

Hello! The categories are spot on — Next.js 15 and React 19 are tightly focused on JS/TS and web development. The task is completely clear. I am well acquainted with the features of Next.js App Router, SSR, validation through Zod, and state management with Redux Toolkit. I understand how important it is to work carefully with an already launched and functioning project to avoid breaking anything.
Here’s how I propose to structure the first phase:
1. Technical audit: I will connect to the repository, understand the architecture, check the quality of server-side rendering (SSR), code cleanliness, and mobile adaptation.
2. Report and priorities: I will prepare a simple and clear list of identified issues and bottlenecks (regarding performance, bugs, and SEO). We will categorize them into critical (what needs to be fixed right now) and planned.
3. Fixes: We will gradually address the top-priority bugs and move on to site development (integrations, forms, admin panel).
Preliminary estimate for the first phase (full audit + fixing the first 2-3 critical bugs):
Budget: 5,000 – 7,000 UAH (further tasks and support will be assessed as we go).
Timeline: 3–5 days for a thorough review and initial fixes.
I am ready to discuss the details in the chat, take a look at the site, and initiate the first phase through Safe. Looking forward to hearing from you!

Budget: 300 USD Deadline: 2 days

Hello! I am a Fullstack developer (Next.js + Laravel). I work with production projects on Next.js.

Relevant experience:
→ AI Povești (aipovesti.com) — Next.js 16 + TypeScript + Tailwind, SSR, i18n (3 languages), Stripe, PostgreSQL
→ AI Interview Trainer (techinterviewai.com) — SaaS on Next.js, JWT authorization, Telegram Mini App, asynchronous queue

Regarding your technical specifications — comments:

- Review of the existing project — standard practice: I go through the structure (app router / pages router), file organization, type states, imports, error and loading states
- SSR and loading speed — I look at hydration, unnecessary 'use client', useEffect instead of server data, bundle size
- Mobile adaptation — Tailwind sm:/md:/lg: + checking in devtools on real devices
- Forms, admin panel, external integrations — Zod for validation, Stripe webhooks, OAuth — I have done all this and know the typical pitfalls
- Technical SEO — metadata API, JSON-LD Schema, canonical/hreflang, sitemap, robots
- Working with a live site — feature flags, staged rollout, backup before changes

Work format:
The first stage — familiarization with the code (1–2 days) + a document with identified issues and priorities. After approval — phased corrections. Git, each change in a separate PR/commit.

Budget and timelines:

Review + report (list of issues with priorities)

• Stage: Review + report (list of issues with priorities)

• Hours: 6–10 hours

• Price: $100–150

Fixing identified issues

• Stage: Fixing identified issues

• Hours: from 15 hours

• Price: from $200

Further development (hourly support)

• Stage: Further development (hourly support)

• Price: $10–15/hour Expand

Budget: 100 USD Deadline: 2 days

Hello.

I can join the project and start with a technical review: understand the structure, check the code quality, SSR/App Router, performance, mobile version, forms, admin panel, SEO, and integrations.

I work with Next.js, React, TypeScript, Tailwind, Redux Toolkit, Zod, as well as with Prisma, JWT, Stripe, Mailgun, Google APIs, and deployment on Vercel/Netlify.

After the review, I will prepare a list of identified issues and suggest priorities: what needs to be fixed immediately, what can be improved gradually, and what affects the speed and stability of the site.

I work carefully with active projects: first analysis and testing, then corrections without unnecessary risk to the working site.

I am ready to start with the project audit, and then, if necessary, connect to ongoing support and improvements. Expand

Budget: 100 USD Deadline: 1 day

Good day. I am interested in your offer. You can view my projects at the link.
https://github.com/VitaliiBarabash1990

Budget: 130 USD Deadline: 3 days

Good day, Dmitry!

I looked at your website from the outside and found two real bugs during a quick check, both confirmed by direct inspection of the source code, not assumptions. This is what can be seen in 5 minutes at the surface level; a full review will surely uncover more.

First: on the pages /rv-upholstery-in-austin, /boat-upholstery-in-austin, /aircraft-upholstery-in-austin, the canonical tag points to a different address (/rv-upholstery, /boat-upholstery, /aircraft-upholstery), and that address redirects back. Sitemap.xml and canonical on the same page argue about which URL is correct, which signals confusion to Google during indexing.

Second, more serious: all 8 application form pages (/select-service and one for each category, from furniture to aviation) return the same title and description "Leather Sofa & Handbag Repair," while all of them are open for indexing. For example, the aviation upholstery application page appears in search as about sofas and bags. It seems that the title on this route is taken from a hardcoded default rather than generated for the category. For the search engine, this results in 8 indistinguishable duplicate pages instead of eight targeted ones.

I work with the stack (Next.js 15 App Router, React 19, TypeScript, Tailwind, Zod, Redux Toolkit, Prisma, JWT, Stripe, Mailgun, Google APIs) without restrictions, including common traps for Next.js 15: fetch() is no longer cached by default if the project has migrated from version 14, some pages may have silently become fully dynamic, and params and searchParams in App Router are now Promises; synchronous access to them either breaks rendering or gives a silent warning.

In the first stage: I will familiarize myself with the project and repository, conduct a technical audit (architecture and code quality, server-side rendering and loading speed, forms and admin part, JWT/Stripe/Mailgun/Google APIs integrations, mobile responsiveness, technical SEO across all routes) and propose a list of priority changes with a clear explanation for each item. After that, if everything is satisfactory, we will move on to ongoing work on further development of the site. We will assess further ongoing work based on the results of the audit.

I am ready to start today. Expand

Budget: 200 USD Deadline: 4 days

Hello. Yes, I can join the project.

First, I will study the current structure and code, check SSR, performance, mobile version, forms, integrations, and technical SEO. After the review, I will prepare a list of identified issues and prioritize them.

Then, I will be able to carefully fix errors and refine the existing functionality without disrupting the operation of the current website.

I am ready to discuss access to the project and start with the technical audit.

Budget: 150 USD Deadline: 2 days

Hello, Dmitry.

I ran lerega.com before writing, so below are measurements, not promises.

First, about what you have in order, this is also part of the response.

SSR works. The server delivers 290 KB of ready HTML: h1, service texts, and FAQ are already inside, down to a single line of JS. The same goes for internal pages, headers X-Nextjs-Prerender: 1 and X-Vercel-Cache: HIT, meaning the pages are prerendered and served from the edge cache. If someone tells you that the site has effectively become an SPA and SSR is broken, check for yourself: curl on the main page, all content is there. The confusion is typical: in the App Router there is no __NEXT_DATA__, instead, there is self.__next_f, and those looking for the old marker see "SPA."

The speed is normal: TTFB 191 ms, first contentful paint 852 ms, full load 1.77 s on mobile emulation. The markup is done seriously: FAQPage, Service, Offer, LocalBusiness on city pages, address, working hours, rating. I won’t sell you "we'll speed it up and boost SEO," there’s nothing to easily pick up.

Now what I found.

1. Tracking weighs more than your code. Your own JS is 462 KB in 23 chunks, third-party about 870 KB on the first pass. gtag for G-VWRM2NY942 loads twice: hardcoded in the site and once more through the GTM-KBJDXN8W container. I checked whether this causes duplicate page_view in GA4: no, one for each property. So this is not data corruption, but extra weight, and it can be removed carefully.

2. The second is more expensive. In your code, fbq('track') is not called anywhere: all conversions for Meta and Google Ads live in GTM, there are form_submit, generate_lead, and conversion_id. Meanwhile, there is not a single form tag on the main page, the button leads to /select-service. I won’t assert anything without seeing Test Events, but the first thing I would check in your project is whether the Lead event reaches Meta from this funnel. If it doesn’t reach, advertising is optimized blindly, and this is more expensive than all other points combined.

Why me. In the portfolio here on the platform, the first job is called: fixing Meta tracking. This is my own store on Next.js in production. Server-side Purchases were silently lost there, the browser event left before the server could send its own. I implemented deduplication by event_id and checked everything in Events Manager, screenshots are attached in the work. That’s why I was eager to see where your Lead event should be going.

The first stage, as you requested: a review and a list of corrections by priority with an estimate of labor costs. 150 USD, 2 days. Further based on the actual tasks. Expand

Budget: 100 USD Deadline: 4 days

Hello! Regarding the Next.js 15 review, first, I will look at the boundary between server/client components: most often, speed and SSR suffer due to unnecessary "use client" at the root of the tree and data being pulled on the client instead of server components. I will check the caching of fetch and revalidate in the App Router, duplicate requests, and the size of the client bundle. I will also take a separate look at Stripe to ensure that webhooks are received with the raw body; otherwise, the signature won't match, and payments will be silently lost. In the end, I will send a list of corrections prioritized by what impacts speed and what is risky to leave as is. I can provide a free walkthrough of the approach in private messages and show a couple of bottlenecks directly in your code. I look forward to collaborating.

Budget: 200 USD Deadline: 2 days

Good day!
1. Although you should have SSR, it actually seems to be SPA judging by the page resources. This concerns SEO.
2. Evaluate the structure and quality of the code - this point raises many questions based on my first point.
3. Fix errors and improve the current functionality - while browsing the site, I noticed a couple of obvious issues, minor, but a full analysis will show where the problems lie.

Regarding all other points, everything ultimately hinges on SSR - which apparently is not working correctly.

On the surface - support and gradually improve the existing site.

This is not a problem; the only question is understanding the scope of work.

In total, I work at a rate of $25 per hour.

I plan to spend (reading the code myself, not running it through cloud or other models) between 6 to 12 hours on the audit. Since I need to understand the structure, the overall scheme of your APP, and then go through the logic, requests, caching, and so on. There is also the question of Total Blocking Time - I need to understand where the loading stream is blocked, but this is only on the mobile version.

In general, I think to average the estimated hours to 8 - that’s $200.
I indicate 2 days, as I always allocate buffer time.
(Regardless, if it’s not in Docker, I will need to set it up for the project; I prefer to use isolated environments for deployment.) Expand

Budget: 300 USD Deadline: 2 days

Hello! Support, auditing, and gradual scaling of an already launched project is a great task. When the project is built on the latest stack (Next.js 15 and React 19), it is critically important to ensure that new features do not break backward compatibility and that server components (RSC) are used efficiently without overloading the client bundle.
As a Senior Full-Stack developer with over 6 years of commercial experience specifically with the Next.js, React, TypeScript, and Redux Toolkit ecosystem, I specialize in optimizing architecture and refactoring others' code.
Here’s how I will structure the first phase of work (Technical Audit):
1. Architecture and RSC Analysis: I will check the structure of the App Router. I will ensure that Server Components and Client Components are properly separated, data is requested on the server directly through Prisma (without unnecessary internal API calls), and Redux Toolkit is used only where global client state is truly needed.
2. Security and Authorization Check: I will conduct a review of JWT authorization and middleware. I will check the validation of input data through Zod in Server Actions / API Routes to eliminate vulnerabilities.
3. Core Web Vitals and SSR Optimization: I will check the caching strategies of Next.js 15, optimization of images, fonts, and third-party scripts (Stripe, Google APIs). The goal is to achieve maximum loading speed and stable rendering without layout shifts (CLS) on mobile devices.
4. Integrations and Forms: I will verify the correctness of handling Stripe webhooks, the logic of sending emails through Mailgun, and the operation of server functions on Vercel/Netlify.
Responses to your requirements:
Platform and stack: Full compliance. I regularly work with Next.js 15, React 19, TypeScript, Tailwind, Zod, RTK, Prisma, and payment gateways.
Work format: I act as carefully as possible. Any changes are first tested locally and on the staging branch, deployment to production only after complete testing and agreement with you.
Communication: I do not just silently fix bugs. Based on the audit results, I will prepare a structured report (technical backlog) for you with a description of the identified issues, their impact on SEO/speed, and a proposal for clear solutions prioritized accordingly.
Commercial terms:
First phase (Audit, code review + compilation of a list of priority changes): $300 USD.
Audit timeframe: 2–3 days.
Further support: We will discuss a format convenient for you.
Best regards,
Sergey Expand

Budget: 400 USD Deadline: 5 days

Hello!

I have experience with your technology stack. I have often worked on optimization and refactoring in projects, so your task will not be new.

The plan is as follows:
- I will analyze the project and compile a list of issues
- Together with you, we will discuss priorities and the order of addressing issues to synchronize with current business requirements
- Actual resolution

Budget: 300 USD Deadline: 10 days

Hello!

I have experience working with Next.js, TypeScript, Tailwind.
I am ready to complete the assigned task.

I suggest discussing the details in private messages.

Budget: 150 USD Deadline: 5 days

Good day! I will conduct a technical review of your project and provide a list of priority changes that will improve page loading speed by 30% and enhance the overall performance of the site. In my work, I use Next.js 15, React 19, TypeScript, and I am also skilled in optimizing server-side rendering and working with external integrations. Please message me privately, and I will send examples of completed projects and documentation on improvements.

Budget: 1000 USD Deadline: 30 days

Hello,
I am ready to join the project part-time.
I have some payment preferences and am ready to discuss.
I have 5 years of experience with ReactJS and about 3 years with Next.

Budget: 100 USD Deadline: 7 days

Hello!

I am interested in your offer, especially because it is not a one-time task, but an opportunity for long-term collaboration and product development.

I work with JavaScript/TypeScript, React, Next.js, Tailwind CSS, REST API, and have experience in developing full-stack applications. I have also worked with forms, authentication, third-party service integrations, performance optimization, and responsiveness.

I am comfortable working with existing projects: analyzing someone else's code, identifying problem areas, fixing bugs, and gradually improving the architecture without unnecessary changes. I always try not just to fix a bug, but to understand its cause and propose an optimal solution.

I am ready to start with a technical review of the project, provide a list of priority improvements, and further support and develop the site. I would be happy to become part of the team and work on the project on a permanent basis.

I would appreciate the opportunity to discuss the details of our collaboration. Expand

Budget: 15000 USD Deadline: 10 days

Good day! We have experience working with Next.js 15 and React 19, so we will promptly conduct an audit of the current codebase. We will achieve this through a deep analysis of the architecture, addressing technical debts, and optimizing performance. We are ready to start supporting and scaling your project in the shortest possible time.

Budget: 100 USD Deadline: 1 day

This is an example of work I previously completed using Next.js. Please take a look at it. Thank you.

Budget: 2500 USD Deadline: 5 days

Hello, do you want a quality audit of your software?
Message me, estimates and quotes in 1 day, audit in 3-5 days.
Don't hesitate.

Budget: 150 USD Deadline: 3 days

Hello! I am ready to start with the technical review of the project on Next.js 15 / React 19 / TypeScript: to check the structure of the App Router, SSR, typing, Redux state, forms, and integrations, and then create a prioritized list of issues with an assessment of fixes. I will make changes gradually to avoid disrupting the functioning of the existing site. Please let me know if there is currently a critical error or section that needs to be checked first? A quick first step would be to deploy the project, check the build, and prepare a brief audit with priorities.

Budget: 1000 USD Deadline: 1 day

Hello, I have relevant experience.
Write to me privately - we will discuss.
I will be happy to help you!

Budget: 100 USD Deadline: 1 day

Hello, I have extensive experience working with next.js and would be happy to complete your task, check, and refine what is needed.
My Git: https://github.com/onyx144

Budget: 2500 USD Deadline: 2 days

Good day! I have reviewed the task and am ready to start.

Experience:
• 4 years in Frontend and Backend development
• 2 years of commercial experience in product and blockchain
• Working with production code and real financial scenarios

Some of my projects:

https://contentbuilder.ai/ - a commercial project from the USA, where I worked as a full-stack developer and implemented most of the functionality

https://freelancehunt.com/showcase/work/procasino/2025898.html

https://freelancehunt.com/showcase/work/bionrgg/2025897.html Expand

Budget: 150 USD Deadline: 5 days

Hello!

My stack is completely mine - Next.js, React, TypeScript, Tailwind, Redux Toolkit, plus experience with FastAPI/Python on the backend, Docker, WebSockets, and integrations (Twilio, payment APIs, Google APIs).

What I can do in the first stage:
1. review the project structure, assess the architecture of components, data handling (Prisma/Zod schemas, if any), and the quality of typing;
2. check the SSR/CSR balance, where rendering can be moved to the server for speed;
3. look at Core Web Vitals, mobile adaptation, forms, and external integrations;
4. compile a list of priority issues with clear explanations — what is critical, what can be postponed.

Feel free to reach out. Expand

Budget: 1000 USD Deadline: 30 days

Hello!
I am very interested in your project and ready to help.

About me: I have over 5 years of experience in Backend/Node.js development, Front-End with Vue.js/Nuxt.js and React.js/Next.js, exclusively on large commercial projects. I have worked in large teams and also have experience in independent software development.

My GitHub: https://github.com/virus231
LinkedIn: https://www.linkedin.com/in/vladyslav-prodan-4865891a0/

Feel free to contact me!

Budget: 700 USD Deadline: 7 days

Hello.

According to the project description, you need not just a developer for Next.js, but someone who has experience supporting already functioning projects in production, can quickly understand such a project, grasp its actual state, and safely continue the development process without unnecessary experiments.

I have already held such a role in the express delivery service project QWQER.lv.

I joined the product 4 years ago, which already existed and had been developed earlier by other developers. On the first day, I was simply given access to the project—without documentation and without a detailed immersion. The first task was to understand the architecture and codebase, conduct a technical audit, identify key problem areas, assess the volume of technical debt, and propose a phased implementation plan.

After that, I gradually refactored the system, fixed bugs, wrote documentation, and added new functionality without breaking the working service.

On technical issues, I worked directly with the CEO, so I am used to making decisions independently, explaining the pros and cons of different options, and taking responsibility for their implementation. After getting acquainted with the project, I usually form a list of tasks with priorities myself, discuss it with the client, and then proceed according to the agreed plan.

This is exactly the approach I would suggest here: start with analyzing the structure of the App Router, API, authorization, server components, and client side. This will quickly provide an objective picture of the project, determine priorities, and only then move on to changes.

And if after the audit it turns out that some decisions are controversial, I will first show the consequences and options, and only then will I make any changes.

In general, if the project is already running in production, I try not to change anything until I fully understand why it is structured that way.

I have one question. Was the site initially developed by one developer, or have several people worked on it at different times? Usually, this helps to immediately understand where the problem areas are most likely to be.

Honestly, I like such projects the most: first understanding the system, and only then making technical decisions. Expand

Budget: 25 USD Deadline: 1 day

Hello! My tech stack (Next.js 15, React 19, TypeScript, Tailwind, Zod, Prisma, Redux) perfectly matches your project. My level is Middle+, and I work closely with App Router and SSR optimization.
The main benefit for you is that I can quickly and accurately understand someone else's code, refactor, and implement features without breaking what already works.
Relevant experience:
artmastermops.net.ua — complete migration to Next.js, deep technical SEO, development of a responsive admin panel, and payment setup.
paymex.io — fintech project with strict typing, JWT authorization, and complex integrations with external APIs (Google Sheets).
my-fitness-club.com — development of a complex custom CRM system with PWA.
Plan for the first stage (Audit):
1. I study the architecture, state management, and interaction with the database (Prisma).
2. I analyze bottlenecks: quality of server rendering, loading speed, and display on mobile devices.
3. I create a clear report and roadmap of priority technical fixes.
I am ready to discuss the details and gain access to the repository to start the audit. Message me! Expand

Budget: 375 USD Deadline: 5 days

Hello!

I am a Frontend developer with experience in developing production web applications and Telegram bots.

My experience (project examples):

— Mister.Am (https://misteram.com.ua) — food delivery service similar to Glovo. React, Next.js, Redux, Effector, Styled Components, working in a Scrum team.

— Reelix Bot (@reelix_movie_bot) — Telegram bot on TypeScript, grammY, MongoDB, Docker, deployed on Hetzner VPS with CI/CD via GitHub Actions.

I have experience with REST API, state management, and the full deployment cycle. I am ready to discuss your project! Expand

Budget: 1234 USD Deadline: 1 day

Hello! I have experience with Next.js, React, TypeScript, Prisma, and Stripe/JWT integrations. I would be happy to help you!

Budget: 30 USD Deadline: 5 days

Good day. I specialize in writing projects in the field you mentioned. It would be great to discuss the details in person. The revision will take about 5 days.

Budget: 100 USD Deadline: 2 days

Good afternoon. I will conduct a technical review of the project on Next.js and TypeScript, identify weak points, and improve server-side rendering to speed up page loading. I am ready to discuss the details and start working. I look forward to collaborating.

Budget: 700 USD Deadline: 5 days

Good day!
I saw your task and immediately became interested — I specialize in Next.js 15 (App Router, Server Actions, React Server Components) and have significant experience migrating projects from plain JavaScript (or old React) to modern Next.js.

In the past year, I have successfully transferred several projects from vanilla JS to Next.js 15+. I know how to properly organize:
• App Router + Server Components
• Performance optimization (Turbopack, Partial Prerendering, caching strategies)
• State, routes, API, SEO migration
• Transition to TypeScript (if needed)
• Configuring SSR/SSG/ISR for your tasks
For me, this is not just about “moving code,” but making the architecture modern, fast, easy to maintain, and scalable.

I am ready to quickly understand your project, propose an optimal migration plan, and show how it will look in practice.
I can work either in stages (critical parts first) or completely close the migration.
I would be happy to discuss the details of your project and show examples of previous work.

I look forward to your response! Expand

Budget: 350 USD Deadline: 4 days

Hi Dmitriy,

This is my exact daily stack, so I'll talk about the audit rather than list technologies back to you.

When I audit a Next.js 15 App Router project, the issues usually cluster in a few predictable places, and that's where I'd start:
- Server and client component boundaries: unnecessary "use client" high in the tree that quietly kills SSR and ships too much JS to the browser
- Data fetching in the wrong place: client-side fetches that should be server components or route handlers, which hurts both load speed and SEO
- Redux Toolkit with SSR: hydration mismatches and state that's initialized on the client when it should come from the server, a common source of flicker and bugs
- Prisma query efficiency: N+1 patterns and missing indexes behind slow pages
- Zod coverage and JWT handling: where validation and auth are thin or inconsistent
- Technical SEO: whether the Metadata API, canonical tags, sitemap and hreflang are actually wired correctly per route

My first-stage deliverable is a written audit: what I found, why it matters, and a prioritized list of changes split into quick wins, real bugs, and performance work, so you can decide what to tackle first rather than getting a vague "it needs cleanup."

After that I'm set up for exactly the ongoing model you describe, fixing bugs, improving SSR and load speed, forms and admin, the Stripe and Mailgun and Google integrations, and gradual improvements, working carefully in someone else's codebase without breaking what already works.

Track record: 37 projects, all completed, 10/10 rating.

For the first stage, the audit plus prioritized plan, I'd quote 350 USD, about 4 days once I have repo access. Ongoing work after that I can do hourly or per agreed task, whichever you prefer.

One question: is the site's main pain right now performance and SSR, or specific broken functionality? It tells me where to point the audit first.

Revaz Expand

Budget: 50 USD Deadline: 5 days

Hello! I am interested in your task for the refinement and support of the project on Next.js 15. I have extensive experience with the current stack (React 19, TypeScript, Tailwind, Zod), as well as a deep understanding of the App Router and server-side rendering (SSR). I can quickly dive into someone else's code, conduct an architecture audit, and identify bottlenecks in performance. I am ready to start with a technical review, compile a list of priority tasks, and begin their implementation. I would be happy to help with the development of your project. I am ready to discuss the details, feel free to write!

Budget: 30 USD Deadline: 1 day

I am a NextJs, React, NestJs developer. I am ready to take on this task.

Budget: 425 USD Deadline: 4 days

Hello! I have extensive experience in development with Next.js, React, and TypeScript, regularly working on other people's projects, conducting code audits, optimizing SSR, performance, and SEO. I will quickly understand the project's architecture, prepare a list of priority improvements, and suggest optimal solutions without risking the functioning website. I am looking forward to a long-term collaboration and am ready to start in the near future.

Budget: 50 USD Deadline: 3 days

Hello!
The task is clear, and I have experience. I suggest starting with a technical review. I will check the architecture of the App Router, Server and Client Components, SSR, caching, hydration, performance, TypeScript types, etc.
I will check the working site as carefully as possible through the repository and test environment to eliminate risk for production.
Before we start collaborating, I can perform a small part of the review for free. For example, I can check the structure of the App Router or one problematic page and show the first found issues. If this approach suits you, we will continue with the full review and further development.
To assess the first stage, I will need access to the repository and information on where the project is currently deployed.

Budget: 170 USD Deadline: 4 days

Hello!
I am interested in your project. I have experience working with React, TypeScript, Next.js, as well as with technical optimization, SEO, and improving existing websites.
I am ready to start with a technical review of the project: studying the current architecture, assessing the quality of the code, identifying problem areas, and preparing a list of priority changes with clear recommendations. After that, I can work on fixing bugs, developing functionality, optimizing performance, SSR, responsiveness, SEO, and providing ongoing support for the project.
I am comfortable understanding other people's code, work carefully with active projects, and always try to offer solutions that genuinely improve the quality of the product.
I would be happy to discuss the details and learn more about the project.

Budget: 25 USD Deadline: 1 day

Hello, I have worked specifically with the same stack, https://daily-a2hj.onrender.com/ in this project, feel free to write and I will conduct an analysis.

Budget: 50 USD Deadline: 1 day

Good day, Dmitriy!
In general, the task is clear, but to provide an accurate response regarding deadlines and pricing, I would like to clarify some questions that arose after analyzing your task.
Please write in private messages – we will discuss the details and your wishes.

Budget: 300 USD Deadline: 5 days

hello
ready to work
I have been working for over 15 years
examples
mymycars.com
https://www.strawhomes.com

Budget: 12000 USD Deadline: 4 days

We already have a nearly ready process for reviewing and refining next.js projects with admin panels, forms, and integrations; it can be quickly adapted to your site, and we can discuss the details in the marketplace chat, I'm available.
We can start with the first stage - technical review, risk map, quick fixes, and priorities for further development.
The timeline is approximately 4 working days, and the budget for the first stage is 12,000 UAH.
After gaining access to the repository, I will carefully check the structure, server-side rendering, performance, forms, mobile display, authorization, and integrations.
At the same time, we can connect AI code review - it helps to quickly find recurring errors, weak points in types, dependencies, and data processing.
I need to clarify - will the repository be open for review, or do we start with the archive?
And the second question - in the first stage, do we need only a report with priorities, or do we also fix critical errors within the budget?
Similar cases in approach:
- https://business.ingello.com/platforma - a complex platform with architecture, roles, and product development
- https://business.ingello.com/forma-crm - admin panel, business logic, and working with existing processes
our flh landing - https://systems-fl.ingello.com Expand

Budget: 100 USD Deadline: 2 days

Hi there,

I have strong experience with Next.js, React, TypeScript, and maintaining production applications built on modern web stacks.

✔ Technical audit of the existing project architecture and code quality
✔ Experience working with Next.js App Router, SSR, caching strategies, and performance optimization
✔ Ability to quickly understand and improve existing codebases without disrupting production systems
✔ Optimization of page speed, mobile responsiveness, technical SEO, and external integrations
✔ Experience with Prisma, JWT authentication, Stripe, Mailgun, Google APIs, and serverless environments such as Vercel

My approach is to first perform a detailed audit, identify technical debt, performance bottlenecks, and architectural risks, then provide a prioritized improvement plan with clear recommendations.

I value clean code, maintainability, and careful, incremental improvements to existing products.

Looking forward to reviewing your project and helping with its long-term development.

Thanks. Expand

Budget: 82 USD Deadline: 4 days

I will conduct an audit: App Router structure, server/client components, Zod form schemas, Redux slices, integrations (Prisma, JWT, Stripe if available). I will check SSR caching, Core Web Vitals, mobile responsiveness, meta tags/SEO. The result will be a list of priority issues with solutions, deadline 4 days.

Budget: 77 USD Deadline: 3 days

The task is clear: first — a technical review of the current project on Next.js 15 / App Router, then a list of priority fixes. I would start with an audit of the project structure, checking the SSR/SSG strategy for the pages, working with forms and Zod validation, the state of Redux Toolkit, as well as mobile adaptation and basic technical SEO (meta tags, loading speed, Core Web Vitals). As a result, I will prepare a clear list of issues with priorities and suggestions for fixes — I am ready to show the results of the review in about 3 days, then we can discuss ongoing work on the project.

Budget: 120 USD Deadline: 6 days

Dmitry, I see that it is critically important to conduct an audit of the current codebase on Next.js 15 to identify the causes of instability and prepare a foundation for further scaling of functionality. My task is to stabilize the project and ensure the correct operation of server-side rendering and existing integrations.

I will analyze the structure of components and the state of SSR, after which I will specifically fix errors in forms and the logic of interaction with external APIs to ensure that the site works stably and quickly on any devices.

Are there currently specific bugs that occur most frequently, or is the main request related to the technical optimization of the code before adding new features?