Full-Stack Web Application Development | AI Integration

Budget: 2000 USD Deadline: 30 days

Hello. I can build the full-stack application end to end: responsive React interface, secure Node.js API, PostgreSQL, authentication, deployment, and the required AI/LLM workflows.

I would first lock the user flows and data model, then deliver the core product in working iterations with a final production deployment.

Stack: React/Next.js, Node.js, PostgreSQL, Docker, OpenAI API.
Timeline: 30 days. Budget: $2,000.

Do you already have a detailed product brief or wireframes?

Budget: 5000 USD Deadline: 49 days

Hello!
We are the Business Atlas team, official n8n partners. Developing a responsive web application with a secure backend, authentication, database integration, and modern AI capabilities (chatbots, process automation, LLM agents) is our core expertise. My experience shows that we will deliver this project 100%.
The core of your project relies on three critical pillars:
First — Responsive UI/UX & Authentication. Creating clean, minimalist, and responsive interfaces (Pixel-Perfect) with Desktop, Tablet, and Mobile support. Setting up a reliable user authentication system and access control.
Second — Secure Backend & Database Architecture (FastAPI / Node.js + DB). Developing a high-performance REST API in Python (FastAPI) or Node.js. Designing a relational database (PostgreSQL / Supabase) to store user profiles and logs, alongside Redis for session caching. Setting up Docker containerization, SSL certificates, and isolated VPS infrastructures for data protection.
Third — AI Functionality, LLM Agents & Process Orchestration (n8n Engine). Implementing intelligent scenarios powered by GPT-4o or Claude 3.5 Sonnet: building chatbots, integrating RAG systems (Qdrant / Pinecone vector databases) to work with your knowledge base, and automating background workflows and external APIs using n8n.
My experience as a project manager, combined with my team's expertise, is specifically focused on system architecture, AI automations, and complex web service development. Our tech lead will ensure backend code cleanliness, API stability, and deployment security. We deploy the entire infrastructure self-hosted on your VPS, guaranteeing 100% data privacy and avoiding unnecessary ongoing subscription fees.
Our Relevant Cases: Building complex AI pipelines for multimedia and text processing, creating vector knowledge bases for chatbots, developing secure backend infrastructures, and automating operational processes for E-commerce and B2B.
Development Phases:
1. Paid Discovery (requirements audit, technical specs, DB architecture scheme, and AI routing): 3–5 days — $100 – $230.
2. Core MVP (responsive web interface, authentication, DB, and basic APIs): 14–21 days — $1,500 – $3,000.
3. AI & Automation (LLM integration, chatbot, RAG system, and n8n workflows): 10–14 days — $800 – $2,500.
Send me a direct message to let me know which specific AI scenarios or automations you plan to implement first. Expand

Budget: 2000 USD Deadline: 30 days

Hello.

I'm NodeJS developer. I have expirience with AI. Ready for work

Budget: 2000 USD Deadline: 15 days

Hi Wilson,

You’re looking for more than just “a web app” — this needs to come together as a complete product: responsive frontend, clean UI, secure backend APIs, authentication, database layer, and reliable deployment, with room for AI features if they’re part of the final scope. That end-to-end thinking is exactly how I approach builds like this.

What I can do for you:
• build the application structure cleanly so the frontend, backend, auth, and database work together without friction
• implement secure API architecture and authentication carefully from the start
• keep the UI responsive and straightforward rather than overcomplicated
• prepare the project for deployment properly, not as an afterthought
• add AI functionality in a practical way if needed, whether that’s chatbot behavior, workflow automation, or LLM-driven features

The most important part in a project like this is making sure the core application is solid before layering AI on top. That avoids the common issue of bolting on AI to an app that isn’t structured for it.

If you already have a scope, I can review it and turn it into a clear implementation plan. If not, I can help define the build in a way that keeps the core app and any AI functionality aligned from day one.

🌐 My portfolio with recent cases:
https://mrnko.com
💼 Freelancehunt profile:
Freelancehunt
🤝 I’d be glad to discuss the details, answer your questions, and suggest the optimal solution for your project. Expand

Budget: 1999 USD Deadline: 8 days

Hello Wilson, your project needs a solid mix of clean UI, secure APIs, auth, and deployment—and I can cover that end to end. I’ve spent 8 years building responsive web apps and websites from scratch, turning requirements into stable, user-friendly products. I also work comfortably with database integration and AI features like chatbots or workflow automation when needed. If you’d like, I can suggest the best stack and implementation plan.
Prices start at $1,000

Budget: 5000 USD Deadline: 45 days

Hi, Wilson.

I’m a developer with over 10 years of experience who has been building websites like this all along. You can check out my biggest projects in my portfolio. I won’t overwhelm you with a bunch of technical jargon; instead, I’ll briefly explain my vision for this project. There are many ways to fulfill your technical requirements, but there are three main ones:
1. The cheapest option. Implement it using a CMS (Content Management System). You’ll be able to edit all the blocks, but that’s where the advantages end. It will run slowly (and get even slower over time), and it will be very difficult to do anything non-standard. This isn’t the right option for you.
2. The mid-range option. Implement the functionality using a robust framework like Yii2, Yii3, or Laravel. Everything you need will be available in the admin panel. All pages will load quickly and won’t slow down over time thanks to good optimization. Any non-standard functionality can be implemented. On the downside: it will be significantly more expensive than the first option, and since it will be done by one person, it will take a month or more. This is the option I’m recommending to you. All your requirements will be met for a reasonable price.
3. The Full-Scale Option. Hire a large firm or team. They’ll do the same thing as in option 2, but it will be several times more expensive and take about twice as long. You should choose this option if you have a very tight deadline and plenty of money.

I guarantee that you’ll be satisfied with our collaboration. Going forward, work on the site (updates, new features) can be carried out in “sprints.” We’ll sit down, agree on what needs to be done in a week, then I’ll implement it, we’ll review the results, and deploy it to the production server. Is there something more urgent? We can build, test, and release it right away. We’ll discuss all these details with you as we go. The main thing is that everything will be completed relatively quickly and delivered as soon as possible.

If you’d like to assess the quality of my code (perhaps through a referral or a consultation with Claude), you can check out my code on GitHub: https://github.com/fuegoalma

I’m happy to answer any additional questions you may have via PM. This is an approximate estimate, as there isn’t enough information to give a more precise assessment. I’m a full-stack developer, so I can help with everything—from design to deploying the release version to the production server. Expand

Budget: 2222 USD Deadline: 1 day

Hello!

This is exactly what I work on — web applications with AI integrations and automation.

My stack: Bubble.io + Make + OpenAI/Groq API.

What I have already implemented:
— Glowly — AI learning platform with content generation, personalization, and automated onboarding
— E-Pharmacy — marketplace with API integrations, automatic notifications, and a Telegram bot
— Telegram bot with AI logic (LLM integration via OpenAI)
— Webhooks, REST API, OAuth2, automation via Make Expand

Budget: 2000 USD Deadline: 30 days

I've built a few projects that map closely to what you're describing: a responsive Nuxt/Next.js frontend talking to a NestJS backend, PostgreSQL for data, JWT-based auth, and clean API design from the start. Secure endpoints and proper database integration aren't afterthoughts in my workflow, they're part of the initial architecture.

The AI side is interesting too. I've worked with LLM integrations for chat and automation flows, so if that scope grows, I can handle it without switching to a different developer mid-project.

My stack is TypeScript throughout, Vue/Nuxt or React/Next.js on the frontend, NestJS on the backend. I focus on keeping the codebase readable and maintainable, not just functional. Deployments, environment config, and CI basics are things I set up regularly.

Happy to discuss the scope in more detail if you want to share more context.

Budget: 2000 USD Deadline: 10 days

I offer to develop your web application with a focus on adaptability, API security and integration. I will use HTML, CSS, JS for the frontend, Python for the backend and AI functionality. I can implement both basic authentication and database work, as well as advanced AI solutions.

Write to me, we will discuss everything in detail, and I can start working immediately.

Portfolio: Freelancehunt
Reviews: Freelancehunt

Budget: 2000 USD Deadline: 21 days

Hello! I have worked on similar projects — a full cycle from API and authorization to deployment, with NestJS/PostgreSQL on the backend and React/Next.js on the frontend. A lot depends on the volume and how deep the AI integration needs to be, so I suggest we first have a call to finalize the specific stack and features to avoid overpaying for unnecessary things. Let's discuss the details.

Budget: 2000 USD Deadline: 7 days

Good day!

I am interested in your project for developing a web application. I have extensive experience in creating modern websites and turnkey applications.

I am ready to perform all assigned tasks with high quality: develop a user-friendly responsive interface, set up a secure backend, implement authorization, connect a database, and handle deployment. I also have experience integrating AI technologies, chatbots, and LLM (if necessary).

I guarantee a professional approach, adherence to deadlines, and clean code. I would be happy to discuss the details, your tech stack, and evaluate the cost and timelines for execution. I look forward to your response!

Best regards,
Stanislav

Budget: 2000 USD Deadline: 30 days

Hello ⭐️! I am a highly skilled web developer with over ✅ 7 years of expertise in backend development and modern web technologies.

Recent Projects:
✔️ https://homenly.com
✔️ https://omgfirms.com
✔️ https://novobudova.pro
✔️ https://confidence-tech.com
✔️ https://homexcrm.com
✔️ https://yotu.pro
✔️ https://skyhigh-lviv.com/
✔️ https://sweet-sdpearls.de/
✔️ https://aquahub.org.ua
✔️ https://boostylabs.com
✔️ https://ol.zp.ua
✔️ https://emporio-sports.cz

My stack includes:
✅ Frontend: HTML, CSS, JavaScript, React.js, Vue.js, Angular
✅ CMS: Wordpress(woo), OpenCart, Prestashop, Webflow
✅ Mobile Apps: Flutter, React Native
✅ Backend: PHP, Laravel, CodeIgniter, Python, Django, Flask, Node.js
✅ Databases: MySQL, PostgreSQL
✅ Other Skills: Git, API Integration

Why Choose Me?
✔️ Fast & High-Quality Execution: Your tasks will be delivered on time with impeccable quality.
✔️ API Integration: Need seamless third-party API integrations? I've got you covered.
✔️ Custom Solutions: I take your ideas and transform them into successful web solutions tailored to your business needs.

Let’s collaborate and create something amazing together! Expand

Budget: 2000 USD Deadline: 14 days

Hello! The task is perfectly clear. You need a complete, secure web application with a well-thought-out interface, a reliable database, and fully set up infrastructure. I perfectly understand how to properly connect a user-friendly frontend with a protected API so that the system works fast, scales easily, and remains stable across all devices.

If the project requires AI integrations (chatbots, LLM models, or workflow automation), I will lay the right architectural foundation from the very beginning, making the addition of these smart features completely seamless for the core application.

I specialize in building such comprehensive platforms from scratch. As an example: when developing my-fitness-club.com, I implemented a secure custom API, a complex role-based authentication system, and deep database integration, all while maintaining a very clean and intuitive UI. I also engineered a closed platform for logistics and transport tenders, where user data security, strict authorization, and backend stability were the top priorities.

🎁 Bonuses from me for your project:

Free hosting for the frontend.

Free connection and setup of your domain.

1 month of completely free technical support after the full launch of the project.

I would be glad to discuss the business logic in detail and get to work right away. Feel free to message me! Expand

Budget: 4500 USD Deadline: 35 days

we already have a very close ai enabled web application foundation, so we can adapt it and launch the first working version quickly ))

the realistic starting estimate is 4500 usd and about 35 working days for an mvp with clean responsive ui, secure backend api, authentication, database structure, deployment, and one ai module.

we would build it in stages - product logic and roles, clickable prototype, backend and database, ai integration, testing, deployment.

for ai, we can add a chatbot, llm powered assistant, document or knowledge base search, workflow automation, or internal operator assistant - the best option depends on the business process.

please clarify 2 points so we can make the estimate exact.

- which user roles are needed in the system
- should the ai work only as a chatbot, or should it trigger real actions inside the application

relevant examples from our side
- https://business.ingello.com/vorfahr - ai and automation logic for operational processes
- https://business.ingello.com/fractal - ai agents and workflow automation architecture
- https://business.ingello.com/platforma - complex business platform with roles and backend logic

our main freelancehunt landing
https://systems-fl.ingello.com

we are online and can discuss the scope here on the platform (: Expand

Budget: 2000 USD Deadline: 7 days

Good day! I already have experience in developing similar web applications with frontend, backend, API, database, and authentication.

I have implemented projects using React/Vite and FastAPI, worked with MongoDB, personal accounts, order history, forms, secure APIs, and integrations with external systems. I also developed an application for a large online store with a catalog, favorites, user profile, orders, and a chatbot.

I am ready to create a turnkey responsive web application: interface, backend, authorization, database, API, and deployment. If needed, I can add integration with LLM, AI chatbot, or workflow automation.

I work independently, providing the source code, documentation, and all access. I will provide an exact estimate after reviewing the structure, user roles, and functional requirements.

Budget: 2000 USD Deadline: 30 days

Hi! I build production web applications end-to-end — React/Next.js on the frontend, Node.js or Laravel on the backend, secure APIs, authentication, PostgreSQL, and deployment. I've also done this at real scale: I architected a multi-country online-taxi platform end-to-end — backend, APIs, auth, real-time order flow, and card payments.

I also build production AI features using Claude, GPT, Qwen, and Mistral — chatbot integrations, LLM-powered workflows, and automation. My master's focused on LLMs — comparing them empirically, with real statistical evaluation — so I build on how the models actually behave, not just the API surface. Keeping the web app and the AI layer in one pair of hands makes development simpler and faster.

The brief is still fairly high-level, so I have two quick questions:

• What's the core product you're building?

• Which AI capabilities are you looking for — chatbot, workflow automation, or more custom LLM functionality?

Once I understand the scope, I'll outline the implementation approach, timeline, and a realistic estimate.

Looking forward to hearing more. Expand

Budget: 2000 USD Deadline: 5 days

Hi!

The scope is clear: a full-featured web application with a clean UI, secure APIs, authentication, and database integration.

For the tech stack, I suggest:
— frontend: TypeScript + React
— backend: Node.js (or Rust if higher security/performance is required)

We can finalize the stack after discussing the project goals, expected load, and security requirements in more detail.

I have relevant experience building similar systems, including API integrations, workflow automation, and scalable backend architecture.

Regarding AI features:
I can implement both custom logic (for workflows/business processes) and LLM integrations. That said, AI should be used only where it actually adds value. For example, a chatbot’s implementation would depend entirely on its use cases and the type of queries it needs to handle.

As for the budget:
I’m generally comfortable with your range, but I’ll provide a precise estimate after reviewing a detailed specification or at least a task breakdown — to avoid overestimating.

Timeline:
I’ll be able to provide accurate timelines after evaluating the full scope of work.

Let’s discuss the project in more detail — I can then propose a concrete architecture and implementation plan. Expand

Budget: 2000 USD Deadline: 14 days

Hi,

I’m a full-stack developer with strong experience building modern web applications using JavaScript, TypeScript, React, Node.js, and secure backend architectures. I can develop a responsive, high-performance application with authentication, database integration, REST APIs, and production-ready deployment.

I also have experience integrating AI features, including LLM-powered chatbots, workflow automation, and OpenAI-based solutions, ensuring they fit seamlessly into existing applications.

I focus on clean code, security, scalability, and clear communication throughout the project. I’d be happy to discuss your requirements and help deliver a reliable, maintainable solution.

Looking forward to hearing from you.

Budget: 2000 USD Deadline: 30 days

Hi! I’m a full-stack developer, mostly focused on backend development. My main stack is Node.js, NestJS, Express, React, PostgreSQL and MongoDB.

I usually take care of the whole project - frontend, backend, authentication, database setup, third-party integrations, deployment and support after launch.

I’ve also worked with AI integrations, automation, external APIs and payment systems.

You can check some of my work in the portfolio. Send me a message and I’ll tell you more about similar projects, possible timelines and the estimated cost.

Budget: 2000 USD Deadline: 30 days

Hi! The stack for this project is JavaScript, TypeScript, Node.js, React, PostgreSQL. I specialize in connecting different services via API and writing custom backend APIs or scripts from scratch whenever standard options fall short. I also know how to write precise prompts and configure AI tools so the LLM gives accurate, high-quality results.

Once everything is ready, I will deploy the web app directly onto your server and make sure it runs smoothly.

Budget: 2000 USD Deadline: 15 days

Good day.

I have extensive experience in developing full-stack web applications and secure backend APIs using Laravel and Livewire/Vue. I can also handle the integration of AI features, as I have worked with various APIs and workflow automations before.

What specific AI models or LLMs are you planning to integrate into the application?

Let's discuss the details and start our cooperation, okay 🙂

Best regards, Denis

Budget: 2000 USD Deadline: 30 days

Good evening! You already have a performer for a similar project. But if you are looking for another one, I would like to offer my candidacy. Could I please see the detailed specifications for project evaluation?

Budget: 2000 USD Deadline: 7 days

Hi Wilson,

Before I commit to a number, two questions that actually change the build: what does the application do and who uses it, and is the AI part a chatbot over your own documents/data (RAG), or workflow automation between services, or an LLM feature inside the product? Those are three different projects.

My proposal: fix stage one — auth, REST API, database schema, deployment with Docker and CI — as a defined, fixed-price block, and scope the AI layer separately once we know which of the three it is. You don't pay for scope nobody has written down yet.

Background: Python/FastAPI and Django backends on PostgreSQL, React on the front, Docker and CI/CD on AWS. On the AI side I built a desktop assistant where the agent loop and the retrieval/RAG layer are written by hand, not glued from LangChain — so I know where these integrations actually break.

Code: github.com/kamedashe

Bohdan Expand

Budget: 2000 USD Deadline: 31 days

Good day!
I am interested in your project.
I have experience working with backend, APIs, databases, and integrations, and I am also interested in AI solutions and modern web technologies. I would be happy to learn more about the technical task to assess the scope of work and propose an optimal solution.
If it is convenient for you, please send the technical specifications or a more detailed project description in private messages. After reviewing, I will be able to immediately assess the timelines, costs, and answer any questions.
I look forward to collaborating!

Budget: 2000 USD Deadline: 15 days

Good day, let's discuss the details. I have extensive experience in this.