Piotr

Available to hire

Senior AI Full Stack Developer | Web & Mobile Apps | Python, Django, FastAPI, Next.js I build scalable web apps, mobile apps, and AI-powered products that are clean, fast, and production-ready from day one.

About

Senior AI Full Stack Developer | Web & Mobile Apps | Python, Django, FastAPI, Next.js

I build scalable web apps, mobile apps, and AI-powered products that are clean, fast, and production-ready from day one.

7+ years experience | 80+ apps delivered | Startups to enterprise

➤ WHAT I DO
✅ Full Stack Development – Django/FastAPI/Node.js backends + Next.js/React frontends, deployed on AWS with Docker
✅ AI Development – LLM integrations, RAG pipelines, AI agents, OpenAI/GPT-4 features, LangChain, and prompt engineering for reliable, production-grade outputs
✅ Web & App Development – SaaS platforms, MVPs, dashboards, marketplaces, and cross-platform mobile apps
✅ Back-End & API Development – REST/GraphQL APIs, microservices, Stripe payments, third-party integrations, auth (JWT, OAuth, SSO), RBAC
✅ Front-End Development – Responsive, fast UIs with React, Next.js, TypeScript, Vue.js, and Tailwind CSS
✅ CMS Development – Custom CMS, headless CMS setups, and admin panels your team can manage without a developer

🛠️ TECH STACK
Backend: Python, Django, FastAPI, Flask, Node.js, Laravel, Microservices
Frontend: Next.js, React, TypeScript, Tailwind CSS, Lovable
AI/LLM: OpenAI API, LangChain, RAG, AI Agents, GPT-4, Prompt Engineering
Databases: PostgreSQL, MySQL, MongoDB, Redis, Firebase, Supabase
Cloud/DevOps: AWS (S3, Lambda, API Gateway), Docker, CI/CD, Serverless

🏆 WHY CLIENTS HIRE ME
🔹 Business-first: every feature ties back to revenue, retention, and speed-to-market
🔹 Fast delivery: MVPs live in 2–4 weeks
🔹 Clean, scalable, well-documented code – no technical debt left behind
🔹 Clear daily/weekly updates, zero guesswork
🔹 I flag risks early and give honest product and UX feedback

💬 WHAT CLIENTS SAY
⭐⭐⭐⭐⭐ “Highly skilled and well-organized. Always delivers on time and is someone you can truly rely on.”
⭐⭐⭐⭐⭐ “Did a great job building our SaaS platform. Clean architecture and everything was delivered on time.”
⭐⭐⭐⭐⭐ “Understood our AI SaaS requirements quickly and implemented the features smoothly.”

🎯 IDEAL FOR

  • Startups needing an MVP fast
  • Founders adding AI/LLM features to existing products
  • Teams needing a reliable long-term full stack developer
  • Businesses rescuing, optimizing, or scaling an existing app

🏭 INDUSTRIES
E-commerce, Healthcare (HIPAA), EdTech/LMS, Real Estate, FinTech, Retail, Logistics, Travel, Sports & Fitness

📩 Message me with your project idea and I will reply within 4 hours. Let’s build something great.

  • Joined October 2026

Languages

  • EnglishAdvanced
  • PolishFluent

Industry experience

  • Education
  • Financial Services
  • Non-Profit Organization
  • Healthcare
  • Agriculture & Mining
  • Transportation & Logistics
  • Travel & Hospitality
  • Government
  • Consumer Goods
  • Real Estate & Construction
  • Retail
  • Energy & Utilities
  • Manufacturing

More experts in Warsaw, Poland

Projects · 1

Image Genie - built with Lovable

An AI-Powered Image Tools SaaS web app built with Lovable.dev. SaaS Development React TypeScript Supabase No-Code Development Lovable

  • AI Developer
  • Back-End Developer
  • Front-End Developer
  • +2

Work experience

Senior AI Full Stack Developer · Atomic ObjectAug 2023 – May 2025 · 1 yr 10 mos

Developed an AI-powered SaaS application that helped users search business knowledge, automate repetitive tasks, and access contextual answers. Built full stack features with Next.js, React, TypeScript, Python, and FastAPI, integrating OpenAI APIs, LLM-based workflows, and Retrieval-Augmented Generation (RAG). Implemented document processing, vector search, API integrations, and secure user authentication. Improved response quality through prompt engineering and evaluation, while using PostgreSQL, Docker, AWS, and automated testing to support reliable deployments and scalable product development.

Senior Full Stack / Backend Developer · LiipJan 2021 – Jul 2023 · 2 yrs 7 mos

Contributed to a digital service platform that combined customer dashboards, business workflows, and external API integrations. Built backend applications with Python, Django, and FastAPI, and developed reusable frontend components using React, Next.js, and TypeScript. Designed REST APIs, optimized PostgreSQL queries, and implemented secure authentication and permission controls. Also supported CMS integrations, automated testing, Docker deployments, and CI/CD improvements. Worked closely with cross-functional teams to troubleshoot production issues, improve application performance, and deliver maintainable features.

Full Stack Developer · 10CloudsFeb 2019 – Dec 2020 · 1 yr 11 mos

Worked on a SaaS business management platform designed to streamline internal workflows and customer operations. Developed responsive web interfaces using React, Next.js, and TypeScript, while building backend services and REST APIs with Python, Django, and PostgreSQL. Integrated authentication, role-based access control, payment processing, and third-party services. Contributed to database design, automated testing, Docker-based deployments, and AWS infrastructure. Collaborated with designers and product teams to turn requirements into reliable features and maintainable production code.

Education

Bachelor of Science in Computer Science · Warsaw University of Technology2014 – 2018

- Graduation thesis: Design and Implementation of a Scalable Web Application Using REST APIs and Relational Databases - Relevant subjects: Software Engineering, Algorithms and Data Structures, Database Systems, Web Technologies, Object-Oriented Programming, and Distributed Systems.

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