Budget: 27000 UAH Deadline: 11 days
Good day, I am ready to implement your project.
About me: What sets me apart from competitors?
I am a programmer, IT solutions architect, with 12 years in IT. I founded the company ingello\systems, before that I was the technical director of the company TAXER. Prior to that, I was the director of the company Sitio. Before that — a senior programmer at Igrolan.
During my work, I have saved startups and companies (without exaggeration) hundreds of thousands of dollars. There are specific examples, see below.
I am looking for interesting and complex, multi-stage projects, and I also consider equity participation in startups (I have experience). You can trust me with a project of any level, and here are the proofs:
Video about my team:
https://youtu.be/FNsIiQM-cfk
Our website:
https://systems.ingello.com
Budget: 27000 UAH Deadline: 7 days
Good day, I have extensive experience in creating online stores. I have experience with various payment systems and have designed layouts. I am ready to take on the task, feel free to reach out.
Examples of work:
https://deltamodul.de/
https://www.peachandlily.com/
https://www.proektmrii.com.ua/
Budget: 27000 UAH Deadline: 20 days
Good evening. I have experience in creating internet resources of varying complexity, as well as solving problems, improvements, and creating websites on OpenCart, WordPress, and others.
I use PHP, Python, and other languages and technologies depending on the task.
I can provide examples of my work if needed.
Write to me, and we will discuss the details.
Budget: 27000 UAH Deadline: 21 days
Quickly and professionally, I will launch an online store for you on OpenCart!
You will receive a modern, user-friendly, and optimized website ready for sales.
✅ Complete turnkey setup package
✅ Integration of payments and deliveries
✅ Preparation for SEO promotion
✅ Assistance in choosing a stylish template
✅ Training on how to use the admin panel (adding products, categories, etc.)
Your store will be fast, beautiful, and ready to generate profit from day one.
📩 Message me privately — we will select a design and discuss the details.
Budget: 26990 UAH Deadline: 29 days
Good day!
My name is Valentin, and I represent Arctic Web Agency. We are a team of experienced web developers specializing in creating modern and effective web solutions for businesses. I can provide examples of our similar work in personal messages. We are ready to take your project to work!
Sincerely,
Arctic Web Team Freelancehunt
Budget: 27000 UAH Deadline: 30 days
Hello! I am ready to create an online store in a minimalist sports style with a responsive design, integration of LiqPay/other payment systems, a delivery module (Nova Poshta), product filtering, and multilingual support (Ukrainian/Russian/English). I will implement social media connections, email newsletters, and synchronization with BAS/1C, as well as provide a user-friendly admin panel and further project support.
Budget: 27000 UAH Deadline: 31 days
Good morning, Vlad.
Write to me, we will do it turnkey.
We will implement it on Opencart.
....................................
Budget: 27000 UAH Deadline: 14 days
Good day
I propose to create a website on Opencart. I will make all necessary integrations and settings. I will implement proper multilingual support.
I provide a guarantee for the website and am ready for further technical support.
Part of the completed work: Freelancehunt
Budget: 27000 UAH Deadline: 14 days
✌️ Hello, portfolio- Freelancehunt
• We offer the candidacy of our team (designer + programmer)
• We will discuss with you and decide on which platform to implement (WordPress + WooCommerce 2 weeks - $900, custom on react + node.js 3.5 weeks - $1,575
🔥 We will select a style, implement the design -> we will resolve the issues of technical implementation, filling products, teach how to use the admin panel, help with the launch
• If desired, we can also engage in promotion. You will close all horses in one place
• Overall, you will receive a top store, with all functionality, products, and integration of payment and accounting.
💎 We will make it the same and even better than this site- https://fitnessmarket.ua/
Budget: 27000 UAH Deadline: 30 days
Thank you for the detailed description of the task. Your project clearly outlines all the key features of a modern online store, and we can implement it in a way that is not only convenient but also effective in terms of sales.
How we can help:
Magento 2 is the optimal platform for scalable eCommerce solutions. It allows you to implement all your requirements: multilingual support, flexible filters, integrations with payment systems and delivery services.
Sports-style design — we will create a minimalist, dynamic, and responsive UI that meets modern UX trends.
Integrations: LiqPay, Nova Poshta, social networks, email newsletters, BAS Accounting or 1C — everything can be automated for convenient management.
Further support — we can provide technical support, performance optimization, and store development after launch.
Examples of our work:
United Porte
Dolya Solar
Fone Kites
You can also view a demo store on Magento 2: demo.stagem.com.ua
I suggest discussing the details: what are your priorities at the start — design or functionality? This will help us prepare a work plan and roadmap.
Would it be convenient for you to organize a short call to clarify the nuances?
Budget: 27000 UAH Deadline: 20 days
Hello 👋! I am a highly qualified web developer with over ✅ 7 years of experience in backend development and modern web technologies. I work with New Construction Corporation Uzhhorod, Remax, Land Rover, Crazy Price Carpets, Confidence CRM, Butam Lt. My stack includes:
✅ Frontend: HTML, CSS, JavaScript, React.js, Vue.js, Angular
✅ Backend: PHP, Laravel, CodeIgniter, Python, Django, Flask, Node.js, Next, Nuxt
✅ CMS: WordPress(Woo), Prestashop, Shopify, OpenCart, BigCommerce
✅ Databases: MySQL, PostgreSQL
✅ Other skills: Git, API integration
Recent projects:
✔️ https://jashantoor.com/
✔️ https://novobudova.pro
✔️ https://stxtrade.com/
✔️ https://boostylabs.com
✔️ https://confidence-tech.com
✔️ https://diamond-firms.com
✔️ https://confidence-crm.com
✔️ https://louca360marketing.com
✔️ https://salehub2b.eu
✔️ https://books.youeasystart.com
✔️ https://ukrfix.com
✔️ https://sweet-sdpearls.de/
✔️ https://lottobingom.com/categories/hot
✔️ https://aquahub.org.ua
✔️ https://boostylabs.com
✔️ https://ol.zp.ua
✔️ https://smt-industry.com
✔️ https://butams.com
✔️ https://emporio-sports.cz
Why choose me?
✔️ Fast and quality execution: Your tasks will be completed on time with impeccable quality.
✔️ API integration: Need seamless integrations of third-party APIs? I’ve got you covered.
✔️ Custom solutions: I take your ideas and turn them into successful web solutions tailored to your business needs.
Let’s collaborate and create something amazing together!
Budget: 27000 UAH Deadline: 30 days
Hello.
The website can be launched on Khoroshop.
On my part, I offer SEO services.
I have promoted such brands: easypay.ua, freelancehunt.com, isei.ua, krkr.com.ua
Cases - Freelancehunt
SEO services:
1. SEO audit of the website - from 10,000 UAH
2. Consultation - 1,200 UAH - 1 hour
3. Project management (good results if the promotion period is from 12 months).
Work - from 15 hours per month - from 15,000 UAH
Plus budget for the project (links, texts, services).
Next, we will look at the overall budget + level of competition.
Budget: 27000 UAH Deadline: 30 days
Hello.
I have reviewed the task.
I will create a quality website with clean optimized code and modern design.
Please write to me in private messages to discuss all the project details!
----------------------------------
Private web developer. Experience – 10 years.
Design, layout, WordPress website development.
Budget: 27000 UAH Deadline: 24 days
Hello, there are already similar works with all integrations in the portfolio
alliesofskin.com.ua
ritualangels.com
Budget: 27000 UAH Deadline: 10 days
Hello! I am ready to complete the work in accordance with all the points listed in the technical specification. I guarantee the quality and timeliness of the work.
Feel free to write, I will be happy to collaborate.
Budget: 27000 UAH Deadline: 10 days
Good day!
I have experience in developing online stores, including design in a minimalist sports style and responsiveness for mobile devices. Integration of payment systems, setting up delivery through Nova Poshta, and implementing filters are tasks I have already worked on.
I will ensure multilingual support in Ukrainian, Russian, and English, as well as integration with social networks and email newsletters. Synchronization with BAS Accounting or 1C is also possible.
I am ready to discuss the project details and further technical support. We will collaborate on the OpenCart platform, which will provide all the necessary functions.
I look forward to the opportunity to collaborate!
Proposals concealed
Proposals are currently absent
Budget: 27000 UAH Deadline: 5 days
Good day, I am interested in your project, please write back so we can discuss in more detail)
Budget: 27000 UAH Deadline: 15 days
I can develop a modern website in a minimalist sports style with a responsive design for mobile devices, integrate payment systems (LiqPay or other popular ones in Ukraine), set up delivery through Nova Poshta, implement filters for categories, brands, and price ranges, ensure multilingual support (Ukrainian, Russian, English), and integrate with social media and email newsletters. I can also set up synchronization with BAS Accounting or 1C and provide further technical support as agreed.
Budget: 27000 UAH Deadline: 30 days
Hello. I can do your project. I have experience. Write to me and we will agree.
- Projects -
- Rating -
- Rating 437
Budget: 27000 UAH Deadline: 90 days
Good day!
We are the IT studio Lucrumond. Our team has over 20 years of combined experience in web development and creating modern digital solutions. We have already implemented projects with complex logic, so we are ready to confidently take on your online store.
We will provide:
-modern minimalist design with mobile device adaptability;
-integration of payment systems (LiqPay, WayForPay, Fondy);
-connection of the delivery module (Nova Poshta);
-flexible filters (categories, brands, price range);
-multilingual support (UA/RU/EN);
-integration with social networks and e-mail newsletters;
-synchronization with BAS Accounting or 1C.
We focus on modern UX/UI trends, strictly adhere to deadlines, and are always open to communication. We can also provide technical support after launch (by separate agreement).
We would be happy to discuss the details of your project and offer optimal solutions.
Best regards,
Yaroslav, Co-Founder
https://www.lucrumond.com/
Budget: 27000 UAH Deadline: 1 day
Good day
I am ready to collaborate - I work in a team with a designer). I have extensive experience in project management, including writing Technical Specifications (TS), testing, selecting and working with designers and developers to achieve the results you need. I am confident that I can help you) The hourly rate, I would be happy to discuss in more detail with you)
Experience as a PM in website and mobile app development (plus advertising) for about 4 years in the office and now over 4 years remotely.
I am in the TOP - 2 as a technical writer
In the TOP - 2 in project management
In the TOP - 7 in testing
I am ready to assist in client management, task setting for developers, testing, documentation writing, prototyping, and consulting not only on general issues but also on development stages.
Budget: 27000 UAH Deadline: 18 days
Hello!
I have experience in similar tasks for 3 years, I have worked specifically in this field on Fiverr.
I am ready to take on your project and complete it quickly and efficiently.
Portfolio in my profile!!!
Development will be on (JavaScript, HTML, CSS, SCSS) + any database of your choice.
I will make adaptation for all devices.
I can add pop-up ads to the site.
Animation according to the design.
Product filters, etc.
I will be happy to collaborate with you.
Sincerely, Roman
Budget: 27000 UAH Deadline: 20 days
Good day! I am implementing a store with a minimalist design, LiqPay, delivery via NP, filters, multilingual support, and integration with 1C/BAS. Experience in React/Next.js, Node.js, API integrations. I guarantee deadlines and support.
Budget: 27000 UAH Deadline: 30 days
Hello!
I will easily develop an online store with a modern design in a minimalist sports style. I have significant experience in creating similar projects with a focus on UX/UI and conversion.
I suggest using my stack — Laravel + Vue.js — for implementation. This approach provides greater flexibility, speed, and ease of scaling compared to template-based CMS, which often limit customization, lead to dependency on plugins, and pose security risks. I will implement: responsive design (mobile/tablets/PC), LiqPay integration, Nova Poshta delivery module, filters (categories, brand, price), multilingual support (UA/RU/EN), integration with social networks and email newsletters, synchronization with BAS/1C, basic SEO optimization, and a user-friendly admin panel.
I am ready for communication, meeting deadlines, and providing technical support after launch. I would be happy to discuss project details, exact costs, and timelines in private messages. Write to start!
Best regards,
Mykola
Budget: 27000 UAH Deadline: 60 days
Good day!
I am ready to take your project into work.
Development on Opencart.
Development time up to 60 days
Development cost 3000$
Sincerely, Ivan
Budget: 27000 UAH Deadline: 20 days
Hello! I am a Python developer with experience in e-commerce, integrations, and frontend. I will create a fully functional sports-themed store with a minimalist UI, payments, delivery, and synchronization with BAS/1C. Design and frontend: clean, minimalist sports style, responsive for mobile.
Stack: Next.js/Nuxt + Tailwind (or Angular/Vue — at your choice).
Backend: Django/DRF or FastAPI (headless API).
- Projects 7
- Rating 5.0
- Rating 885
Budget: 26000 UAH Deadline: 28 days
Good day, I propose to create on the Horoshop platform. Horoshop, compared to Opencart or WordPress, has advantages in that it already has everything necessary for an online store in Ukraine. Payment: LiqPay (Privat 24), WarForPay, Portmone, PayPal, "Installment payment" of PrivatBank, "Purchase in installments" from monobank, delivery: Nova Poshta, Ukrposhta, Avtolux, Delivery, feeds for uploading products to: Google, Rozetka, Facebook, Prom, Hotline, Kasta, there is also the possibility of synchronization with the PRRO from Checkbox, all of this is already available and works on this platform, unlike Opencart or WordPress, where you constantly need to install various modules and plugins for such tasks. Disadvantage: subscription fee "standard" - 680 UAH/month, and there is no possibility to design/change the design itself, changes can only be made in CSS (changing color, size, style of blocks, buttons, etc.), but there is no possibility to add your own blocks as in Opencart and WordPress, although Horoshop has a very large selection of templates https://horoshop.ua/ua/design/.
- Projects -
- Rating -
- Rating 303
Budget: 27000 UAH Deadline: 30 days
Good day, I propose to complete your project on Next.js/Node.js, it is quite possible to implement this in 3-4 weeks, we can use ready-made MUI styling, SEO++ I guarantee.
Budget: 27000 UAH Deadline: 24 days
Hello! 👋
My name is Dima, I am a co-founder of KingKongWeb. I have reviewed your technical assignment and we are ready to implement the project according to your requirements.
✅ What we will do:
• We will develop a unique modern design in a minimalist sports style with responsiveness for mobile devices.
• We will integrate payment systems (LiqPay, Fondy, or others that are convenient for you).
• We will set up a delivery module (Nova Poshta, possible integration with other services).
• We will implement filters by categories, brands, price range, etc.
• We will ensure multilingual support (Ukrainian / Russian / English).
• We will connect social networks + email newsletters.
• We will implement synchronization with BAS Accounting or 1C.
budget: depending on the CMS/platform and the complexity of integration with BAS/1C.
Budget: 27000 UAH Deadline: 15 days
Good day👋
I am ready to implement from A to Z
OVER 7 YEARS OF WORK EXPERIENCE.
I will do everything as best as possible
And discuss everything in detail
I am waiting for you in DMs.
- Projects 3
- Rating 5.0
- Rating 2 944
Budget: 27000 UAH Deadline: 15 days
Hello, we and the team are ready to discuss all the details of the project and the deadlines)
We will do everything quickly and efficiently without unnecessary code)
For quick communication, write in Telegram san4iz_ua
- Projects 8
- Rating 5.0
- Rating 1 591
Budget: 27000 UAH Deadline: 7 days
Hello,
I am a developer in the field of AI/ML & WEB DEV. I can complete your project. Write to me, and we will discuss.
Budget: 27000 UAH Deadline: 20 days
Good day! I have extensive experience in web development, I can create beautiful, responsive, and animated websites, and I have experience in developing online store websites. Write to me, and we will discuss the details. I will complete the work quickly and efficiently.
- Projects -
- Rating -
- Rating 192
Budget: 27000 UAH Deadline: 20 days
Good day!
I have experience in creating e-commerce websites, integrating LiqPay, Nova Poshta, multilingual support, and filters. I am ready to discuss the details and deadlines.
- Projects 7
- Rating 3.4
- Rating -
Budget: 27000 UAH Deadline: 30 days
Hello.
I can do it based on Laravel or a very fast version based on Go (more time for development).
If time is running out (or there are other reasons) I can do it based on Opencart or Wprdpress + Woocommerce.
I have experience integrating various APIs.
Budget: 27000 UAH Deadline: 21 days
Hello! There is an experienced team with over 15 years of experience in creating websites and other IT solutions for businesses. Please write in private for a more detailed discussion. I look forward to collaborating with you!
Budget: 27000 UAH Deadline: 15 days
Good day! I am interested in creating a website for an online store. I have experience in developing similar projects with modern design and a user-friendly management system. I am ready to complete the work efficiently and within the agreed deadlines. I am waiting for details to clarify the requirements.
Budget: 27000 UAH Deadline: 10 days
Hello! Our team is ready to develop your project. Experienced programmers will be involved. If you are interested in our offer, we can discuss the details. There will also be a personal offer for you.
Budget: 27000 UAH Deadline: 20 days
Good day! I have experience in developing online stores for Ukrainian sports brands, including integration with LiqPay and Nova Poshta. I will create a website on Django with a modern minimalist design that perfectly matches the sports style, with full responsiveness. I will integrate all necessary functionalities: filters, multilingual support (with Django CMS for convenient content management), payments, delivery, and 1C synchronization, adding an additional caching module for performance optimization. I am ready to start and adhere to the agreed deadlines.
Budget: 27000 UAH Deadline: 31 days
Good day. I am interested in your order. I have been working in the web sphere since 2014. I propose to implement a store on Laravel. For detailed discussion of the technical specifications, deadlines, and price, please write in private messages.
Budget: 27000 UAH Deadline: 31 days
Good evening, Vlad.
I have experience with similar projects.
I work together with an experienced designer, we can develop a modern design for your online store.
Always online, I respond quickly.
We adhere to deadlines.
Ready for further tech support.
We are ready to move to the development process as soon as we discuss the work plan.
I use gulp for minimizing and optimizing code for fast website loading.
During development:
Cross-browser compatibility, semantic structure, and basic SEO settings (in the code) are maintained.
Image optimization (webp, lazy load, alt)
The setup will be on the WordPress CMS with ready-made solutions for some needs (WooCommerce, ACF, CF7, Duplicator, Backuply, LightHouse/WP-rocket)
Examples of work
SPA "Chickery" (React, RTK Query, MSSQL) — https://chikery-burito228s-projects.vercel.app
Next.js e-commerce PWA (Stripe, i18n, Server Actions) — https://recipe-finder-liart-rho.vercel.app
WordPress (Elementor) https://overhaul.com.ua
Web-Store "Airmontazh" (Gulp, scss, js, html) - https://airmontazh.com.ua
Web-Store "Komfovent" (Gulp, scss, js, html) - https://komfovent.vecon.ua
Web-Store "TDRIVE" (Gulp, scss, js, html) - https://parts.tdrive.com.ua
https://titan-logistic.com/
Weronikauszko.pl
primeclinic.website
www.beehcom.org
https://chopchoplash.shop/
Ghahraman.co
WordPress - Multi-page
https://adkaizen.com/
yakeda.org.ua
https://goodbaking.pro/?srsltid=AfmBOorpqWzevLdX4x0VdzgPtVPH1N-QPQeV5sy9gEPh8jyHPsysN7sO
https://oftalmika.com/
https://jarka.ua/
https://www.diatalisman.com/
Budget: 27000 UAH Deadline: 25 days
Good evening! 👋
I am ready to complete the task after agreeing on all the details.
I have several case studies in my portfolio related to creating online stores.
I can guide you from the idea to the finished product.
Budget: 26500 UAH Deadline: 25 days
Good day,
I am engaged in turnkey website development. As I understand, this is supposed to be an online store for sports nutrition. I will create a modern design with accent colors of your brand. The layout will be fully responsive and functional. I will connect your database and set up payment and delivery. I am ready to further support the project. I would be happy to collaborate.
Budget: 27000 UAH Deadline: 12 days
Good day!
I would be happy to take on the creation of your online store. I have significant experience in website development with a focus on minimalism and a sporty style. I will ensure responsiveness for mobile devices, integration of payment systems, setup of the delivery module, and functionality of filters. Multilingualism and integration with social networks will also be implemented.
I work on the OpenCart platform, which guarantees ease of use and further support. I am ready for active communication to discuss all the details.
I look forward to collaborating!
Proposals concealed
-
Ruslan P. 19 September 2025Якщо ви хочете власний дизайн, щоб таку як у вас ніде інде не було в інтернеті, вам варто дивитися в сторону більше 1 000 американських бумажок.
Якщо ви не проти працювати на якомусь шаблоні який можна трошки прикрасити або трошки видозмінити, то такий варіант виконується за один робочий день і на виході маєте гарний магазин з гарним функціоналом простий і зручний в експлуатації як адміністратором так і користувачем який хоче у вас щось купити
Взагалі звертайтеся, можемо обсудити варіанти шаблонів на яких варто почати роботу вашого магазину
-
Nazar G. 17 September 2025Запропонувати можна тільки на розробку сайту на фреймворку ларавел наприклад. Все з нуля, адмінка і сайт. сео оптимізовано. Але розробкою дизайну займаються вже окремо дизайнери.
Current freelance projects in the category Web Programming
There is a site on Wix Studio. On the product category page (dynamic page), large white gaps appear between product cards on mobile devices when some fields are empty. Product cards without data take up ~1949px in height on mobile. Accordion blocks ("Composition", "Description", "Technical Specifications") reserve a large empty space even when there is no data. The photo gallery block also creates a large white gap when there are no photos. What needs to be done: When the fields "Composition", "Description", "Technical Specifications" are empty in the CMS — the accordion headers should remain visible, but the empty space inside should not be reserved When there are no photos - the gallery block should not create a large white gap The fix should work on all category pages, not just one Important: Section headers ("Composition", "Description", etc.) should always remain visible. Only the empty white space inside should be removed.
There is a site on Wix Studio. On the product category page (dynamic page), large white gaps appear between product cards on mobile devices when some fields are empty. Product cards without data take up ~1949px in height on mobile. Accordion blocks ("Composition", "Description", "Technical Specifications") reserve a large empty space even when there is no data. The photo gallery block also creates a large white gap when there are no photos. What needs to be done: When the fields "Composition", "Description", "Technical Specifications" are empty in the CMS — the accordion headers should remain visible, but the empty space inside should not be reserved When there are no photos - the gallery block should not create a large white gap The fixes should work on all category pages, not just one Important: Section headers ("Composition", "Description", etc.) should always remain visible. Only the empty white space inside should be removed.
I am a professional 3D designer, creating highly detailed renders of monuments and memorial complexes (vertical format 9:16). My clients are workshop and studio owners who need a convenient digital catalog of my models to show to their retail customers. What I need: To select the optimal platform and create a lightweight, fast web app (catalog) that will look perfect on smartphones and open correctly on computers. Key requirements for the catalog: Design: Maximum minimalism. Dark theme (black background), large vertical image (proportions 9:16), with only the name/article of the model below it. No long descriptions. Database management: I need a very simple system for adding new models (ideally through familiar Google Sheets or a very user-friendly internal database). I should just be able to upload an image and enter the article number without breaking the layout. Client integration (Most important): The catalog should be easily integrated into the websites of my workshop clients (some use WordPress, others have custom-built sites). An elegant embedding method needs to be thought out: via Iframe (so the catalog works directly within their page) or through proper button-link setup. What I have already tried: I tested Glide and Adalo. In Adalo, I achieved the desired visual (9:16 on a black background), but managing the internal database and dealing with Google Drive links turned out to be too inconvenient for regular use. Plus, I have doubts about correctly embedding Iframe into other websites so that it doesn't misalign on wide monitors. What I expect from you in the response: On which platform (Adalo, Glide, Bubble, Webflow, Glide + Airtable, or something else) do you propose to implement this and why? How will the issue of storing heavy images (renders) be resolved? How do you propose to technically embed this catalog on the external websites of my clients? I am looking for a specialist who can handle this technical pain point turnkey, so I can focus on 3D modeling.
The website is already launched and operational. The main task is to understand the current project structure, check the quality of implementation, fix identified technical issues, and assist with further changes.Main Stack Next.js 15 React 19 TypeScript Tailwind CSS Zod Redux Toolkit The project may also use: Prisma JWT authorization Stripe Mailgun Google APIs Vercel or Netlify FunctionsMain Tasks conduct an audit of the existing project; evaluate the structure and quality of the code; fix bugs and enhance current functionality; improve server-side rendering and page load speed; check the correctness of the website display on mobile devices; work with forms, the administrative part, and external integrations; make technical SEO changes; maintain and gradually improve the existing website.What is Important to Us good experience with Next.js, React, and TypeScript; ability to understand someone else's code; understanding of SSR and the features of Next.js App Router; attention to performance and quality of implementation; ability to explain identified problems and propose clear solutions; independence and careful work with the existing website. At the first stage, it is necessary to familiarize yourself with the project, conduct a technical audit, and propose a list of priority changes. After that, ongoing work on the further development of the website is possible.
We are looking for an experienced Embedded developer to create energy-efficient firmware for a wearable device (form factor: chest strap) for monitoring psychophysiological state. The circuit design is complete, and development will be based on a development kit with subsequent transfer to a custom board.Stack and hardware base:MCU: Nordic Semiconductor nRF52840 or nRF5340.Development environment: nRF Connect SDK / Zephyr RTOS (strictly C/C++).Peripherals:Optical pulse sensor (PPG) — operates via I2C.6-axis inertial sensor (IMU accelerometer + gyroscope) — operates via SPI.Haptic motor driver (LRA 1030) — controlled via PWM.External SPI Flash memory for cyclic logging.Work scope by stagesStage 1: Bring-up, peripheral drivers, and BLE telemetryGoal: Bring the hardware to life, set up stable data collection, and transmit it to a smartphone/PC.Configure I2C and SPI buses using DMA (Direct Memory Access) to offload the processor.Write/integrate drivers for PPG and IMU (configure polling frequency, sensor FIFO buffers).Deploy a custom BLE profile (GATT service) for real-time transmission of raw data from sensors.Basic initialization of PWM for controlling the haptic LRA motor (launch test vibration patterns).Stage 2: Algorithmic layer (DSP and multi-level feedback logic)Goal: Implement mathematical signal processing directly on the chip (Edge Computing) and device reaction logic.Implement algorithms for filtering motion artifacts: clean the PPG signal using accelerometer data (IMU).Extract R-R intervals (HRV) from the cleaned PPG signal.Implement 4-level system stability logic:Drift Level: Track gradual changes in HRV and breathing.Prediction Level: Calculate a mathematical trend for deterioration.Micro-correction Level: Generate barely noticeable haptic patterns on the LRA motor when a target data pattern is detected.Hardware Reset Level: Implement safety logic (high-intensity haptic pulse at critical metrics).Stage 3: Energy saving, logging, and fault toleranceGoal: Prepare the device for autonomous operation from a miniature battery and ensure "24/7" stability.Deep optimization of energy consumption. Put the MCU into sleep mode (System ON/OFF) between measurement cycles. The processor should wake up only on interrupts from sensor FIFO buffers or a timer.Write a fault-tolerant file system in external SPI Flash (e.g., LittleFS) for autonomous cyclic log saving.Configure a hardware watchdog timer to prevent firmware hangs.Requirements for the performer:Experience in commercial development for Nordic chips (nRF52/nRF53) of at least 3 years.Proficient in Zephyr RTOS and debugging tools (Segger Embedded Studio / VS Code, J-Link).Understanding of digital signal filtering principles (DSP) and low-power design.Having your own debugging kit (nRF52840-DK or similar) for starting work is welcome.Work format:Milestone payments with results documented on GitHub. Please indicate your hourly rate or approximate cost and timeline estimates for each of the three stages.