Hello World — Welcome to My Blog
Hello World
Welcome to my blog! I'm Oleksandr Yusypenko, a Senior Full-Stack Developer specializing in AI integrations.
This is where I'll be sharing my thoughts on:
- AI Development — LangChain, RAG pipelines, multi-agent systems, and practical AI integration patterns
- Full-Stack Engineering — Architecture decisions, performance optimization, and scaling strategies
- Developer Productivity — Tools, workflows, and techniques that make a real difference
Oleksandr Yusypenko
Senior Full-Stack + AI Engineer. Building in public — AI agents, LangGraph, production systems.
Related Posts
Jul 13, 2026
Claude Code config is a team asset, not a personal file
On the robbed monorepo I set up Claude Code the way you'd set up CI or CODEOWNERS: a shared, version-controlled, enforced config so every engineer and every AI agent inherits the same conventions, ownership boundaries, and guardrails.
Jul 8, 2026
We Gave Our Agent a Third Tool. Then We Deleted It.
Melio's meal-plan agent runs on exactly two tools. We eval-tested a third — a deterministic self-check — and it tripled cost per plan and made accuracy worse. Here's the data that got it deleted.
Jul 8, 2026
The Prompt Cache That Silently Did Nothing
We shipped Anthropic prompt caching with green unit tests — and it did nothing in production. The culprit: model-specific cache floors and per-day content ahead of the breakpoint. Here's the diagnosis and the fix.