Hire the Best Backend Rest API Freelancers
in Ukraine

Clients rate our Backend Rest API professionals
Rating is 4.8 out of 5.
4.8/5
Based on 670 client reviews
Andrii I.

Zhytomyr, Ukraine

$30/hr
5.0
19 jobs

Most AI apps demo beautifully — then break the moment real users and real payments hit them. Subscriptions that double-charge, webhooks that silently fail, billing that collapses on the first edge case. I build the part that has to actually work. I'm a full-stack developer focused on Stripe payments and production-grade AI apps on Next.js + Supabase. Bring me an idea or a half-finished product, and I ship the version that holds up when money and users are real. What I handle end to end: — Stripe: subscriptions, metered/usage billing, Connect, Price IDs, webhooks, affiliate & usage tracking — AI features: OpenAI/Claude integrations, RAG, AI workflows wired into a real product — Full stack: Next.js, TypeScript, Supabase (Postgres, RLS, Auth), Vercel — Auth, multi-tenancy, and the unglamorous production glue that keeps it all from breaking Selected results: — PropRadar — AI property-comparison platform (Next.js + Supabase). 5★, "technically very strong." — Stripe Checkout with Price ID + affiliate tracking, plus a full subscription billing dashboard. — AI website generators for B2B. 5★, "exceptional, high-performance." How I work: fixed-price with clear milestones. Instead of jumping on a call, I'll send you a deployed demo so you can judge the quality up front. Glad to start with a small paid task.

  • Next.js
  • AI Development
  • AI Implementation
  • SaaS Development
  • Minimum Viable Product
  • OpenAI API
  • Full-Stack Development
  • TypeScript
  • Supabase
  • Stripe API
  • React
  • Claude
  • PostgreSQL
  • LLM Prompt Engineering
  • API Integration
  • Node.js
  • Pinecone
  • AI Chatbot
  • OAuth
  • Tailwind CSS
Stanislav S.

Lviv, Ukraine

$18/hr
4.9
12 jobs

🚀 Full Stack Developer | Web & Mobile Specialist I have 7 years of hands-on experience building dynamic, responsive, and user-centric applications. I am an experienced Fullstack developer who brings designs to life with clean, user-friendly, and highly performant code. I combine stunning UI/UX with powerful backend logic. My strength lies in transforming complex requirements into elegant, scalable applications that are intuitive, fast, and reliable. 💡 Expertise in technical stacks 📍Frontend: React, React Native, Next.js JavaScript, TypeScript HTML, CSS, Tailwind CSS, SASS Material UI, Bootstrap Responsive and accessible design 📍Backend: Node.js, Express.js, NestJS RESTful API, GraphQL Authentication and authorization 📍State management and tools: Redux, Redux Toolkit Git and GitHub for version control 📍Databases: MongoDB, MySQL, PostgreSQL ✨ Whether you’re launching a startup, scaling an existing product, or simply looking to revamp your digital presence, I’m here to bring your vision to life with cutting-edge solutions and reliable execution. 📩 Let’s build something great together. Reach out today, and let’s turn ideas into amazing digital experiences.

  • REST API
  • React
  • JavaScript
  • Next.js
  • TypeScript
  • HTML
  • CSS
  • Tailwind UI
  • Redux
  • Material UI
  • Sass
  • GraphQL
  • Node.js
  • MySQL
  • React Native
Roman B.

Dnipro, Ukraine

$80/hr
5.0
26 jobs

Top Rated Plus freelancer since 2019! Full Stack Engineer with 11+ years of experience building SaaS products, modernizing legacy systems, and delivering production web applications with Node.js, NestJS, React, Next.js, and TypeScript. I work across the full stack, with Node.js / NestJS on the backend and React / Next.js on the frontend, and also with MERN stack. Most of my work is not just building isolated features. It is taking a product from idea to production, modernizing legacy systems, improving architecture, cleaning up hard-to-maintain logic, and making sure the system is practical to operate and extend long term. I usually help clients with custom SaaS platforms, admin panels, dashboards, CMS, API integrations, automations, and workflow-heavy applications. I also build real-time features when the product depends on fast updates and event-driven behavior. When needed, I can add LLM features, build RAG pipelines, improve retrieval and embedding strategy, and design multi-agent workflows. One example: in my Oktogon Media work history, I helped design and deliver a custom CMS for multi-site content management that replaced several legacy CMS instances. The platform was built with React, Next.js, Node.js, NestJS, MongoDB, MySQL, Docker, Kubernetes, and AWS. As part of that work, I built ETL processes to migrate production data from a commercial CMS into the new platform. The new public frontend became 4x faster and met Lighthouse criteria, while the overall system made content operations more efficient and made new site launches easier. Another example: I built a queue management product from scratch using React, PostgreSQL, and Node.js. It includes real-time updates through socket events and priority-based event logic, and the system is used at Briuta Medical Center. My strengths are a product-oriented mindset, transparent communication, and practical decision-making. I think like a product owner, not just an implementer, so I tend to spot risks early, suggest improvements, and keep the work aligned with the business goal. I’ve worked across Healthcare, EdTech, learning systems, SaaS, media/content platforms, API integrations, and automations, but I’m open to strong products in any domain. If you need a senior full stack engineer who can build, modernize, and help move the product in the right direction, feel free to reach out. If you are impressed by my experience, but can't afford the hourly price, - contact me, and we can negotiate it and find a way to deliver to you the best quality at the market.

  • REST API
  • API
  • MongoDB
  • Node.js
  • Next.js
  • PostgreSQL
  • React
  • ExpressJS
  • TypeScript
  • Web Development
  • NestJS
  • Full-Stack Development
  • Software Development
  • API Integration
  • SaaS
  • SaaS Development
  • HTML
  • CSS
  • Web Application
  • JavaScript
Mikhail D.

Kharkov, Ukraine

$40/hr
5.0
30 jobs

✅ 50+ SaaS projects successfully completed, 14+ MVP done 2️⃣8️⃣ of them in the payments and fintech space - including PSP platforms, payment orchestration systems, hosted fields & checkout flows, and trading platforms for fintech clients. Hands-on integration experience with Stripe, Apple Pay, iDEAL, PayPal and other major payment gateways. 🏆 TOP RATED PLUS | In Top 3 Laravel Developer | Payment Systems Expert | AI-Powered SaaS Specialist | PHP Laravel Developer 💠 7+ Years Experience | Senior Architect specializing in scalable backend architecture and high-load PHP Laravel Developer ecosystems 💠 AI Strategist | Building AI-powered and AI-assisted workflows, integrating AI solutions for custom SaaS products and No-Code/Low-Code integrations 💠 Rapid MVP Delivery | From concept to production-ready launch in 4-6 weeks as a Full Stack Laravel Vue specialist 💠 Proven Track Record | 100% Job Success with 5-star feedback from enterprise and startup clients in the USA, Europe, and the UAE Hello to my future clients and collaborators! I'm Mike - a Senior Full Stack Laravel Vue Developer and Laravel Developer. As a Laravel consultant and Laravel expert specializing in AI-powered SaaS and Fintech, I build modern web applications combining powerful Laravel backend with clean Vue.js and React interfaces built with HTML5, CSS3, and Bootstrap. I also work with WordPress for content-driven platforms and Ruby on Rails for rapid application development. MY DEVELOPMENT JOURNEY Early in my career, I focused on mastering PHP, clean architecture, security and performance, and the Laravel ecosystem, including WordPress and Ruby on Rails projects. Today, as a PHP Laravel Developer, I lead complex projects using Laravel full stack, Vue, React, and Node-based APIs, delivering scalable and secure applications supporting real business growth. Whether it's a SaaS platform, admin panel, WordPress site, or integrating APIs-driven product, I work as a Laravel Developer who understands both business logic and technical scalability. All code is versioned with Git. WHAT I HELP WITH: 1️⃣. Laravel & Full Stack Web Development I'm a Full Stack Laravel Vue developer who builds everything from Laravel codebase to modern JavaScript interfaces, including WordPress themes and Ruby on Rails applications. As a PHP Laravel Developer and Laravel backend specialist, I specialize in: — Advanced Laravel development with Livewire, Filament, and Symfony — Frontend with Vue.js, React, Alpine.js, Tailwind CSS, Bootstrap, and CSS3 — WordPress custom themes, plugins, and CMS solutions — Ruby on Rails rapid application development — Clean architecture, security and performance-focused PHP — MySQL, PostgreSQL, MariaDB integration — Scalable backend architecture for long-term growth 2️⃣. RESTful & GraphQL API Development As a Laravel Developer and Laravel expert, I build robust backend API systems: — RESTful & GraphQL APIs with Laravel — Backend API and third-party services integrations for modern web applications — WebSockets for real-time Laravel platforms — Stripe integration, Firebase, Google Drive, integrating AI solutions via OpenAI API 3️⃣. SaaS Architecture As a Full Stack Laravel Vue developer, I design scalable and secure applications that scale: — Existing Laravel codebase modernization and extension — Multi-tenant architecture and multi-tenant SaaS dashboards — WordPress multisite and Ruby on Rails SaaS solutions — API-first architecture for React, Vue, and Node frontends 4️⃣. Performance & Code Quality As a Senior PHP Laravel Developer, I focus on: — Optimizing code for performance in Laravel and Ruby on Rails — MySQL and PostgreSQL database tuning — Frontend speed for React and Vue — WordPress performance optimization — Clean architecture, security and performance 5️⃣. Admin Panels & Back-Office Systems As a Laravel Developer, I build modern admin panels that help teams run operations smoothly with dashboards built with HTML5, CSS3, Bootstrap, and jQuery. I also deliver WordPress admin customizations and Ruby on Rails back-office solutions. I can help with: — Filament/Livewire admin panels with role-based access — Custom workflows, approvals, audit logs — PDF reports, analytics views, and operational dashboards 6️⃣. E-commerce, Payments & Subscription Systems If your business relies on payment gateway, subscription product, or checkout flows, I deliver as a Full Stack Laravel Vue expert who understands the full product lifecycle, including WordPress WooCommerce and Ruby on Rails e-commerce solutions: — Stripe integration, subscriptions, invoices, and webhooks in PHP Laravel Developer stack — Customer portals and secure checkout with HTML5 and CSS3 — Integrating APIs-first payment systems compatible with React and Vue With deep expertise in Laravel full stack development, I combine clean architecture, security and performance with modern AI-assisted workflows and backend API solutions to deliver scalable and secure applications.

  • API
  • PHP
  • Laravel
  • JavaScript
  • Custom PHP
  • React
  • Vue.js
  • HTML
  • MySQL
  • CSS
  • Full-Stack Development
  • jQuery
  • Git
  • Web Development
  • Web Application
  • HTML5
  • PostgreSQL
  • API Integration
  • WordPress
Vladyslav V.

Kharkiv, Ukraine

$35/hr
5.0
72 jobs

I’m a Senior Python Engineer and Full Stack Developer with 8+ years of experience building web scraping infrastructure, automation platforms, backend systems, and scalable data engineering solutions for startups, SaaS products, trading companies, and data-driven businesses. Clients usually contact me for projects related to Python development, Full Stack development, backend development, backend APIs, web scraping, data extraction, browser automation, Playwright automation, Selenium automation, Scrapy development, ETL pipelines, workflow automation, automation systems, API integrations, real-time data processing, AI automation, OpenAI integrations, scalable backend systems, sportsbook software, betting systems, odds aggregation, analytics platforms, SaaS products, and high-load real-time data systems. Why clients work with me ✔ 8+ years of Python engineering experience ✔ 6+ years of Full-Stack engineering experience ✔ $400K+ earned on Upwork ✔ Top Rated Plus freelancer ✔ Production-grade scalable architectures ✔ Strong communication and reliable delivery ✔ Experience with high-load real-time systems ✔ Long-term technical partnership mindset My main stack includes: Python • FastAPI • Django • Flask • AsyncIO • REST APIs • GraphQL • Playwright • Selenium • Scrapy • WebSockets • Microservices • Celery • SQLAlchemy • Backend Architecture - Web Scraping & Data Engineering Playwright • Selenium • Scrapy • BeautifulSoup • Requests • Browser Automation • Data Extraction • Web Scraping • Data Mining • ETL Pipelines • Proxy Management • Pandas • NumPy • Dask • Scikit-learn • TensorFlow • PyTorch • XGBoost • OpenCV - Advanced Scraping Infrastructure Cloudflare • DataDome • Akamai Bot Manager • PerimeterX • reCAPTCHA • hCaptcha • Residential & Mobile Proxies • Session Management • Authentication Workflows • Browser Fingerprinting - Full Stack Development React • Next.js • TypeScript • JavaScript • HTML5 • CSS3 • Tailwind CSS • Admin Dashboards • SaaS Applications • Analytics Dashboards - Cloud, DevOps & Infrastructure Docker • Kubernetes • AWS • Google Cloud • Azure • GitHub Actions • GitLab CI/CD • Terraform • Ansible • Nginx • Linux AI & LLM Development OpenAI API • GPT-4 • Claude • Llama • AI Agents • RAG • Prompt Engineering • AI Automation • LLM Integrations • As a Full Stack Developer and backend developer, I build backend systems, APIs, automation platforms, web applications, analytics dashboards, browser automation workflows, admin panels, and scalable real-time data products designed for production environments. Web Scraping & Automation As a Python developer specializing in web scraping and automation systems, I build scalable scraping infrastructure for dynamic websites, protected platforms, APIs, marketplaces, SaaS products, and analytics systems. Scraping and automation projects include: • Large-scale web scraping systems • Data extraction pipelines • Browser automation with Playwright and Selenium • Scrapy-based scraping infrastructure • API reverse engineering and API integrations • Proxy management and anti-bot workflows • Marketplace and e-commerce data collection Backend Development & Automation Systems As a Full Stack Developer and backend developer, I also build scalable backend systems, backend APIs, automation infrastructure, workflow automation platforms, web applications, and real-time backend services. Typical backend and automation projects include: • Backend API development • Workflow automation systems • Real-time automation platforms • Monitoring and reporting systems • Data synchronization systems • Internal business automation tools • Web applications and admin dashboards • Cloud-based backend infrastructure Clients hire me as a Python developer and Full Stack Developer when they need scalable backend systems, automation workflows, real-time data processing, or production-grade infrastructure that can support long-term product growth. Sportsbook & Betting Systems I have strong hands-on experience building sportsbook software, betting systems, odds aggregation platforms, sportsbook data systems, and real-time betting infrastructure running in production environments. • Real-time sportsbook odds aggregation systems • Arbitrage and positive EV analytics platforms • Betting automation and execution systems • Historical odds databases and backtesting engines • Sports analytics dashboards and reporting systems • Odds monitoring and alerting systems AI Automation & Data Infrastructure • AI data collection pipelines • OpenAI API integrations • AI automation workflows • RAG and knowledge base infrastructure • AI enrichment and structured data processing If you need a Python developer, Full Stack Developer, backend developer, or automation developer who can build scalable backend systems, automation infrastructure, web applications, sportsbook systems, or real-time data products, feel free to reach out.

  • REST API
  • API Development
  • Python
  • Web Scraping
  • Data Extraction
  • Automation
  • API Integration
  • Data Mining
  • Web Crawling
  • Scrapy
  • FastAPI
  • Database Development
  • Selenium
  • Browser Automation
  • ETL
  • Docker
  • AI Agent Development
  • Data Engineering
  • Back-End Development
  • Full-Stack Development
Denis S.

Kharkiv, Ukraine

$27/hr
5.0
132 jobs

I focus on helping startups and businesses to leverage AI and adapt to modern software industry which is now more accessible than ever. That includes full-stack development, AI automation, prototyping, custom development and of course taking over what you already built and turning it into production grade solution. 🔐 𝗞𝗲𝘆 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀: 1. Full-stack development — end-to-end product building, front to back 2. AI automation — streamlining workflows and processes with AI 3. Prototyping — fast, working proof-of-concepts to validate ideas 4. Hardening — taking over what you've already built and turning it into a production-grade solution 🌠 My background is in custom software development, and I spent a while working as a hands-on engineer. I was lucky enough to spend my entire career working with fast-growing, large-scale, and enterprise clients, representing an outsourcing vendor. 🌌 Apart from development activities, I was engaged in many others: interviewing engineers, participating in pre-sales, training programs, leading and driving development processes, and much more. I was always a company guy and was interested in and open to everything. 👴🏻 That’s where I matured as an engineer. I learned a lot along the way, saw how painful the software development process could be, and understood the pros and cons of different organizations, including where Fortune 100 companies struggle. 📺 I’m a professional engineer focused on delivering business outcomes for you — not a part-time freelancer juggling Upwork with a full-time job or doing it for extra income. I'm working with all types of clients and budgets. ✅ 99% Job Success Score; 100 + projects delivered — from idea to production-ready software 🛡 Expert-Vetted — interviewed and approved by the Upwork team 🚀 Fastest-Growing Upwork Profile Globally — $4M+ earned across multiple profiles since 2022 🌍 Most Recognized & Viewed Upwork Profile Worldwide 💰 Scaled 5 Upwork Profiles to $300K+ revenue each with strong inbound leads 🏢 Delivered Projects for Fortune 100 & Inc. 5000 Companies and UAE government 🧠 Led Pre-Sales, Estimations, Code Reviews & Tech Interviews for top-tier clients 💻 Even if we don’t end up working together, I’ll help you identify risks and guide you on how to make the product happen — because in the end, it’s all about mindset, not just coding skills. 💡 Answering a question how am I different in this competitive AI industry — the answer is simple: mindset. You can learn endless frameworks, libraries, languages — alright, cool, but mindset and deep understanding of this world outside and inside the industry is what really makes a difference. Keywords: Full Stack Development, Full Stack Developer, Web Application, SaaS Platform, MVP Development, React, Next.js, Node.js, TypeScript, REST API, API Integration, PostgreSQL, MongoDB, Authentication, User Management, Admin Dashboard, Backend Services, Payment Integration, Stripe Integration, Subscription Management, Role-Based Access, Scalable Applications, Production-ready, Performance Optimization, System Architecture, Enterprise

  • React
  • JavaScript
  • PHP
  • Node.js
  • Laravel
  • MySQL
  • CSS
  • Vue.js
  • HTML
  • HTML5
  • TypeScript
  • MongoDB
  • Python
  • React Native
  • Full-Stack Development
  • CSS 3
  • Software Development
  • Web Development
  • Next.js
  • API Integration

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