Hire the Best API Developers
in Poland

More than 3,000 reviews on G2
Rating is 4.5 out of 5.
4.5/5
of Upwork by G2 peer reviewers
Ilia I.

Warsaw, Poland

$60/hr
5.0
53 jobs

⚒ Technology stack C#, .NET, WPF, Revit API, AutoCAD API, Civil 3D API, Navisworks API, Inventor API, BIM 360 API, Autodesk Platform Services (formerly Autodesk Forge), HTML, CSS, TypeScript, Angular, React, IFC.js, WebGL, Three.js, AWS, Microsoft Azure, GitHub Actions, Figma, Forma, Machine learning for construction 🔹 Custom Autodesk Revit Plugins, Add-ins 🔹 Machine learning, AI for construction 🔹 BIM and CAD, Design Workflow Automation 🔹 3D Product Configurators, Revit Family Generators 🔹 Design Automation with Autodesk Platform Services (formerly Autodesk Forge) 🔹 Material Take-off, Bill of Materials (BOM) Addins 🔹 Web-based IFC Applications 🔹 Serverless Cloud Applications 🔹 Shop Drawings Automation 🔹 Point Cloud Processing 🔹 Autodesk Forma 🔹 Data Conversion: BIM to JSON, RVT to JSON, etc. I am desperate to provide perfect service for software development. Certified Professional user of Revit. Let's elevate your project together!

  • API
  • 3D Modeling
  • Autodesk Revit
  • Autodesk AutoCAD
  • Autodesk Navisworks
  • Autodesk BIM 360
  • Civil Engineering
  • Building Information Modeling
  • Automation
  • C#
  • Mechanical Engineering
  • Three.js
  • IFC
Ilya P.

Warsaw, Poland

$35/hr
5.0
20 jobs

Full Stack Developer & AI Developer / AI SaaS Developer — I'm a Web Application Developer & AI Engineer focused on AI Solutions & AI SaaS Development. Strong skills as an AI SaaS Architect, Senior Python Developer, and React Developer. Top Rated Plus | 100% Job Success | Only 5-star reviews ⭐⭐⭐⭐⭐ You'll get your AI SaaS prototype in 2 days, your AI-Powered SaaS MVP or AI solution shipped in 6-12 weeks🚀 🎓 BACKGROUND I've Master’s in Data Science & AI, currently preparing a PhD in AI. I’m a Senior Full-Stack Developer / AI Developer & AI Solution Architect with more than 8 years across 60+ projects. 💬 "Ilya led the work as the AI SaaS solutions architect & AI full-stack engineer, taking ownership of the overall architecture and delivery. Ilya delivered as an AI SaaS developer — balancing product, engineering, AI work without losing speed or quality. Ilya was exactly the kind of fractional CTO & engineering partner I was looking for. Highly recommend Ilya" — Jake Kinzelberg, Founder, Insurance AI SaaS, USA 💬 "Thanks to Ilya for developing my AI-powered SaaS. Ilya proved himself as an excellent AI Software developer & fullstack developer, proposed a clean UI UX SaaS Web design, built a solid backend with Python FastAPI, a front end with React" — Dmitri Dalla-Riva, Founder of Aidtrade, Australia 🎯 WHAT I DO I ship production-grade AI SaaS / AI product end-to-end. You come to me when you need: 🔹 SaaS MVP in weeks — built on architecture that scales beyond the prototype 🔹 AI development, AI Integration, LLM integration — RAG pipelines, AI agent SaaS, Voice Agent 🔹 Full Stack development delivery — one senior point of contact, one accountable owner 🔹 A technical co-founder mindset — scoping the SaaS development, making architecture decisions, owning the result 🛠 HOW I WORK As a Senior Full Stack Developer (React Python), AI Architect, I lead a small team — Senior Backend Engineer (Python Node.js), Frontend (React Angular Next.js), Full Stack Developer AI (JavaScript Vue.js jQuery Bootstrap), AI/ML Engineer, Mobile App Developer (Flutter), UI UX designer / SaaS UX designer — all under my direct coordination. In my work as a Full Stack AI SaaS developer & Python developer, I act as your delivery manager: one point of contact, the delivery capacity of a small agency. I work with Founders as a long-term Partner — calm execution, clear communication 📌 AI-Powered SaaS Development As a Full Stack Web Developer / AI SaaS full stack developer / SaaS AI Software Architect, I design SaaS Startup MVP that scale beyond the first version — multi-tenant architecture, role-based access, billing, webhooks, pipelines 🔹 SaaS architecture → Multi-tenant SaaS, RBAC, OAuth2, Stripe, AI API Integration 🔹 SaaS data layer → PostgreSQL, Redis, Supabase, multi-tenant isolation 🔹 SaaS infrastructure → Docker, AWS, Azure, Vercel, Cloudflare, CI/CD 🔹 SaaS delivery & AI MVP Development → SaaS design, MVP-to-production in 6 weeks 📌 AI Software Development As an Anthropic / OpenAI Developer, Data Scientist & Machine Learning Engineer, I integrate LLM & RAG into SaaS & Websites 🔹 AI/LLM integrations → Claude, ChatGPT-5, LLaMA, Mistral — fine-tuning, prompt design 🔹 RAG & Vector DB → LangChain, FAISS, Qdrant, Pinecone, ChromaDB, pgvector — Voyage embeddings, hybrid search inside SaaS, AI SEO 🔹 Generative AI → Stable Diffusion, SDXL, LoRA — custom image pipelines 🔹 AI ML Engineer → AI automation, deep voice agent, Computer Vision, MCP integrations, dashboards, LLM-powered SaaS 📌 Full Stack Development / Web Application Development As an AI Machine learning / Python Full Stack Developer & React developer / Senior Web Developer Python, I own the SaaS product end-to-end — ReactJS Next.js frontends, Python FastAPI Node.js backends with Superbase; MERN stack, PHP, Webflow / WordPress developer. 🔹 Front end developer → React, Next.js, TypeScript, Tailwind CSS, JavaScript 🔹 Backend developer → Python FastAPI, Django, Node.js, REST API development, GraphQL APIs 🔹 Real-time → WebSockets, Server-Sent Events for streaming AI 🔹 Web Application architecture & Web Development → modular monorepos, microservices 🤖 SENIOR AI-AUGMENTED DEVELOPMENT As a Senior AI Engineer / Python Backend Developer, I use modern AI tools for faster AI development: GitHub Copilot for coding, ChatGPT for reasoning, Cursor for refactoring, Claude Code with MCP for architecture, Replit for prototype testing, Lovable for MVPs prototyping, Bolt.new for web app experiments, v0 by Vercel for UI generation 🏆 MY UPWORK TRACK RECORD ✅ Top Rated Plus Expert ✅ 100% Job Success Score ✅ $200K+ earned delivering SaaS & AI Solutions ✅ 16 completed Upwork jobs ✅ 5-star average rating ✅ Upwork Skill Certified — Python Developer; Back-End Development 🤝 LET'S WORK TOGETHER If you're building SaaS or AI solution — you need a technical partner who ships, owns, thinks like a co-founder — message me. You’re taken from idea to deployment — faster and smarter

  • SaaS
  • SaaS Development
  • Full-Stack Development
  • Back-End Development
  • Artificial Intelligence
  • Machine Learning
  • Python
  • React
  • JavaScript
  • Node.js
  • PHP
  • WordPress
  • Software Development
  • SQL
  • Web Application
  • Git
  • HTML
  • CSS
  • Web Development
  • Large Language Model
Volodymyr H.

Warsaw, Poland

$50/hr
5.0
17 jobs

Welcome to my profile! With over 9 years of experience as a PHP, React, Python developer, I am passionate about creating efficient, scalable, and secure web applications. Throughout my career, I have worked with a range of frameworks and CMS platforms, including Laravel, Symfony, Spryker, and WordPress, React, Next, Python, Go. My expertise lies in developing custom web applications, implementing complex functionalities, and optimizing performance. I have a deep understanding of Laravel and Symfony, two widely-used PHP frameworks known for their robustness and flexibility. I have leveraged these frameworks to build tailored solutions for clients across various industries. In addition to Laravel and Symfony, I have extensive experience with Spryker, a powerful e-commerce framework. I have successfully developed and customized e-commerce solutions using Spryker, delivering seamless online shopping experiences for businesses and their customers. Furthermore, I have worked with WordPress, a popular content management system, to create engaging websites and blogs. I am proficient in developing custom themes, and plugins, and optimizing WordPress websites for improved performance and user experience. My skill set includes: - PHP (Spryker, Laravel, Symfony, Wordpress) - Doctrine, Propel, Eloquent - MySQL, PostgreSQL - Redis, Memcached ElasticSearch - RabbitMQ, Google queues - Github, Gitlab, Bitbucket - AWS / Unix / Console - Restful API -React, Next.jsm Python, Go Throughout my career, I have successfully delivered projects for clients in various industries, meeting their unique requirements and exceeding their expectations. I take pride in my ability to translate complex concepts into user-friendly solutions and my commitment to delivering high-quality work. If you are looking for a skilled developer with expertise in Laravel, Symfony, Spryker, React, Python, Go and WordPress, I am confident in my ability to contribute to the success of your project. Let's discuss how I can bring your ideas to life and achieve your desired outcomes.

  • API Development
  • PHP
  • Laravel
  • React
  • Next.js
  • WordPress
  • Python
  • Golang
  • MySQL
  • TypeScript
  • Node.js
  • Vue.js
  • Shopify
  • Elementor
  • Symfony
  • Flask
  • Redis
  • Docker
  • Rust
  • Web Development
Oleg S.

Warsaw, Poland

$40/hr
4.4
56 jobs

With 10+ years of full-stack development, 100+ scalable web apps shipped, and 10,000+ hours architecting Python backends and modern React frontends, I build production-ready systems that scale with your business. My solutions have delivered: * 65% faster page load times through React optimization & server-side rendering * 50% growth in backend performance via Python API optimization & caching * 90% reduction in deployment issues with automated CI/CD pipelines and containerized environments I'm a Top Rated Senior Full-stack developer, specializing in Python for backend and React / TypeScript for frontend - building seamless, secure, and performant web applications from end to end. Why Clients Choose My Full-Stack Expertise * 10+ years developing end-to-end web platforms for startups and enterprises * 100+ successful production deployments across SaaS, e-commerce, fintech, and internal tools Expert in FastAPI, Django, Flask for backend and React + TypeScript for frontend Strong API design, cloud architecture, and CI/CD automation skills Proven results: faster delivery cycles, reduced infrastructure costs, and improved user experience Backend Engineering (Python) * Architecting and developing RESTful and GraphQL APIs using FastAPI, Django, Flask * Database modeling & optimization with PostgreSQL / MySQL / MongoDB / Redis * Authentication & authorization systems (JWT, OAuth2), background workers, cron jobs * Task queues, caching layers, and performance tuning for scalable services Frontend Development (React / TypeScript) * Building high-performance SPAs with React, Next.js, and modern TypeScript architecture * Implementing server-side rendering (SSR) and code splitting for SEO & speed * Component libraries, state management (Redux / Context), and pixel-perfect UI development * API integration, forms, routing, error boundaries, and testing API Architecture & Integrations * Designing clean, secure, and versioned APIs consumed by multiple frontends * Building microservices and internal tools integrated with 3rd-party APIs (Stripe, Auth0, Slack, etc.) * WebSocket & real-time data flows, background processing, and pub/sub systems Tech Stack & Tooling Languages Python · JavaScript (ES6+) · TypeScript · HTML5 · CSS3 Backend Frameworks FastAPI · Django · Flask Frontend Frameworks React · Next.js Databases PostgreSQL · MySQL · MongoDB · Redis Tooling & DevOps Docker · GitHub Actions · GitLab CI/CD · Nginx · AWS / GCP / Azure · S3 · CloudFront Other REST / GraphQL · WebSockets · Celery / RQ · Background Jobs · Testing (Pytest, Jest, React Testing Library) · ESLint · Prettier Recent Wins * SaaS Platform - Built a Python + React platform from scratch; reduced page load times by 62% with SSR and API caching. * E-Commerce Backend - Migrated a monolith to FastAPI microservices; backend throughput improved by 48%. * Internal Dashboard - Delivered a React admin panel with real-time updates and granular RBAC; boosted team efficiency by 35%. * DevOps Automation - Set up CI/CD pipelines and Docker; 90% fewer deployment issues. * Analytics API - Designed a FastAPI backend serving 1M+ requests/day with Redis caching and async I/O. Use Cases * SaaS Platforms - Multi-tenant apps with secure auth, dashboards, and APIs * E-Commerce Backends - Product catalogs, order flows, and payment integrations * Internal Tools & CRMs - Fast admin panels, role-based access, and real-time updates * API-Driven Systems - High-performance backends powering multiple frontends & mobile apps * Modern Frontends - React SPAs and SSR apps with excellent performance and UX Measurable Results * +65% faster frontend load times with code splitting & SSR * +50% backend performance boost using async APIs & caching * +90% fewer deployment issues with containerized CI/CD pipelines * +40% cost reduction by optimizing cloud infrastructure * 2× developer velocity through clean architecture & automation Ready to scale your product with a battle-tested Full-Stack Engineer? Let's build something fast, clean, and production-ready - together.

  • API
  • Python
  • JavaScript
  • Flask
  • Django
  • Node.js
  • Machine Learning
  • Data Scraping
  • Machine Learning Model
  • HTML
  • SQL
  • MySQL
  • PostgreSQL
  • Python Script
  • Docker
Daniel R.

Wolin, Poland

$80/hr
5.0
36 jobs

🥇 TOP RATED PLUS 🙌 100% JOB SUCCESS 🧐 15+ years of varied experience in architecture and development of JavaScript/Node.js/PHP web applications, scrappers and services for different companies and startups. I love to skillfully combine various technologies to solve non-standard problems of any architectural and logical complexity. I masterfully use cluster technologies, which allows me to create high-quality, high-speed, high-availability, fault-tolerant products that don't require constant maintenance. I can easily bypass any protection to obtain data from any sources. I'm interested in long-term relationships. ✓ Technologies:  Web Architecture | Distributed Systems | High Availability Clustering  Web Scraping | Content Distribution Networks (CDN)  Microservices | Virtual Machines (VM) | Live Video Streaming  Virtual Private Networks (VPN) | Containerization ✓ Programming languages & platforms:  JavaScript/TypeScript | Node.js | PHP ✓ Databases:  PostgreSQL | MySQL | MariaDB | Patroni  Redis | Redis Sentinel | Redis Cluster | MongoDB  Knex ORM | Prizma ORM | Drizzle ORM | Eloquent ORM | Mongoose  SQL | NoSQL ✓ Back-end technologies:  Node.js | Express.js  Laravel | Eloquent | Sanctum  Fetch | Ofetch | Axios  WebSockets | Socket.io | WebRTC  Ajax | JSON REST API | GraphQL | OAuth | JWT  Blockchain | Solidity | Web3.js  Stripe | Google Maps API  Data Mapping & Combination  Load Balancing  Telegram Bot Development ✓ Front-end technologies:  Vue 2 | Vue 3 | Pinia | VueX | Nuxt 2 | Nuxt 3 | Composition API | Options API  PrimeVue | Quasar | Vuetify | Tailwind CSS  Fetch | Ofetch | Axios  WebSockets | Socket.io | WebRTC  Server Side Rendering (SSR)  D3.js  Chrome Extensions  HTML | CSS | SASS/SCSS | LESS | PostCSS ✓ Automation/Crawling/Scrapping/Scanners:  Puppeteer  Chrome Extensions | Manifest V2 | Manifest V3  Perimeter X bypass  CloudFlare bypass  JS Injections  Decryption | Decoding  HTTP Proxy/VPN using ✓ Bookmaker Odds, Widgets & Livestreams (zero latency scanners):  Bet365 | Pinnacle | BetMGM | Betradar | Virginbet | Fonbet | Olimp ✓ Desktop technologies:  Electron.js ✓ Tools & Common:  Docker | Docker Compose | Kubernetes | Grafana | OpenSearch | Ansible  Git | GitHub | BitBucket | GitLab  CI/CD  NPM  Apache | Nginx  Gzip | Brotli  Java | C# | C++  Linux Administration (CentOS/Debian/Ubuntu) ✓ Cloud Providers:  Amazon Web Service (Lambda, EC2, S3, API gateway, Cognito, DynamoDB, etc.)  Microsoft Azure  Google Cloud Platform  Firebase (Cloud FireStore, Realtime Database, Cloud Functions)  Digital Ocean  Hetzner Cloud ✓ Areas of interest:  iGaming | Betting | Sportbooks | Onling Gambling | eSports  Artificial Intelligence | Deep Learning | Machine Learning  Cryptocurrency Trading If you have any questions or want to discuss your project, feel free to contact me. I'm always happy to make time for you. Thanks.

  • Node.js
  • JavaScript
  • PHP
  • PostgreSQL
  • Redis
  • Laravel
  • Docker
  • Blockchain
  • Solidity
  • web3.js
  • Websockets
  • Web Scraping
  • Software Architecture
  • Cluster Computing
  • Distributed Computing

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