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 5, 2026
Query-based CDC over WAL: keeping a CQRS Postgres → ClickHouse read model fresh
Query-based CDC vs log-based (WAL) for a CQRS Postgres→ClickHouse read model: watermark polling, ReplacingMergeTree, reconcile-by-key-diff, and freshness-lag alerts.
Jul 3, 2026
Two planes of quality: making meal-plan generation both evaluable and observable
How Melio's meal-plan pipeline splits quality into two planes — online validation and offline evaluation — plus the observability layer that makes them measure the same things, and the reasoning behind which metrics are allowed to block a deploy.
Jun 14, 2026
Hiding an Internal API the Right Way: Why a Proxy Isn't Security
Putting your API behind a proxy feels secure. It isn't — until the origin literally can't be reached any other way. A walk through the Cloudflare Tunnel + Access token + BFF pattern, and why "hiding the URL" is the part everyone gets wrong.