Senior Full Stack Engineer with 10+ years of hands-on experience building production web products. Main stack: Django and FastAPI on the backend, React, Next.js and TypeScript on the frontend, PostgreSQL, PostGIS, MongoDB and Redis underneath. I work across the whole product: data models, APIs, interfaces, integrations, tests, deployment and production support.
Current project: a real-time DefTech system with Python services, React interfaces, MQTT, Protocol Buffers, WebSockets, maps and video streams, including beamforming and NPU-accelerated computer vision on Orange Pi hardware. Earlier: energy metering and billing, real estate, fleet management, IoT, music and mobile products (a React Native + PostGIS app on the App Store and Google Play).
AI work: LLM API integrations (OpenAI, Anthropic, Gemini), RAG, agent workflows with LangChain and LangGraph. I built OnceOnly (Python SDK on PyPI, TypeScript SDK) and AgentPatterns.
Delivery when needed: Docker, Nginx, Jenkins, CI/CD, AWS and GCP. Upwork: 100% Job Success, 15 completed jobs, 2,400+ hours.
Looking for a hands-on senior individual-contributor role, remote, full-time or part-time. Based in Lviv, Ukraine; relocating to Warsaw in December 2026 (B2B via a Polish entity after relocation). English B2.

