# Oleksandr Yusypenko

> Senior Full-Stack Developer and AI Engineer based in Poland, available for hire remotely worldwide. 8+ years of experience, 50+ projects delivered across AI, e-commerce, healthcare, Web3, and government data analytics.

## About

Oleksandr Yusypenko is a senior full-stack developer and AI integration specialist. He builds production-ready AI systems (LangChain, LangGraph, RAG), scalable web applications (NestJS, Next.js, TypeScript), and high-performance data architectures (ClickHouse OLAP on 70M+ row datasets). He works as a freelance engineer and currently serves as the sole engineer at BinaryBuilders (Germany), maintaining a 7-package monorepo with 3 microservices and 50+ materialized views.

- [Full bio and career journey](https://yusypenko.com/about)
- [Why hire Oleksandr — comparison, engagement models, FAQ](https://yusypenko.com/hire)

## Services

- [AI Development](https://yusypenko.com/services/ai-development): LangChain, LangGraph, RAG systems, multi-agent architectures, OpenAI/Anthropic integrations, Langfuse observability
- [Full-Stack Development](https://yusypenko.com/services/full-stack-development): NestJS, Next.js, TypeScript, PostgreSQL, React, SaaS applications, MVPs
- [Backend & Data Architecture](https://yusypenko.com/services/backend-data-architecture): ClickHouse OLAP, microservices, data pipelines, 70M+ row analytics, materialized views
- [Front-End Development](https://yusypenko.com/services/front-end): React, Next.js, TypeScript, Tailwind CSS, Framer Motion, accessible and performant UIs

## Key Projects

- [MealPlan AI Agent](https://yusypenko.com/projects/mealplan-ai): Full-stack AI meal planning platform with LangGraph StateGraph, RAG pipeline (Qdrant), real-time SSE streaming across Python FastAPI + NestJS + Next.js
- [GovChime Analytics Platform](https://yusypenko.com/projects/binarybuilders): Government contracts intelligence with ClickHouse OLAP on 70M+ rows, 50+ materialized views, AI-powered data pipeline

## Technologies

AI: LangChain, LangGraph, RAG, OpenAI API, Anthropic API, Qdrant, Pinecone, Langfuse, Claude Code
Backend: NestJS, Node.js, Express.js, FastAPI, Python, PostgreSQL, ClickHouse, Redis, RabbitMQ, BullMQ
Frontend: Next.js, React, TypeScript, Tailwind CSS, Framer Motion, shadcn/ui
Infrastructure: Docker, AWS, Vercel, Cloudflare Workers, GitHub Actions, pnpm monorepos

## Blog

- [Agent Builders Are Changing How I Ship Code](https://yusypenko.com/blog/building-with-agent-builders-claude-code): Custom Claude Code agents, TDD-driven AI development, MCP integrations
- [PostgreSQL + ClickHouse Dual-Database Pattern](https://yusypenko.com/blog/postgresql-clickhouse-olap-analytics): 70M-row OLAP analytics architecture
- [Why I Moved AI Out of NestJS Into Python LangGraph](https://yusypenko.com/blog/replacing-nestjs-ai-with-python-langgraph): AI service architecture decisions

## Contact

- Website: https://yusypenko.com
- Book a free consultation: https://yusypenko.com/book
- Email: o.yusipenko@gmail.com
- GitHub: https://github.com/oyusypenko
- LinkedIn: https://linkedin.com/in/oleksandr-yusypenko/
- WhatsApp: https://wa.me/48731410806
- Location: Wroclaw, Poland (EU timezone, remote worldwide)
- Extended info: https://yusypenko.com/llms-full.txt