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Event-driven architecture: idempotency and duplicate-message tests
Process one event twice with Node.js and SQLite. A runnable example of transactions, rollback, retries and identity conflicts.
Checking .env files with EnvDoctor: check, sync and audit
A practical guide to my Python CLI EnvDoctor: find missing environment variables, update .env.example and audit source-code references, with executed examples and limitations.
RAG evaluation: separate retrieval from answer quality
A runnable Node.js example covering recall, precision, answer omissions and out-of-corpus questions. Synthetic data, actual test output and limitations.
Learning in public without performing
Publishing notes, tools and half-formed ideas accelerates learning — if you separate sharing from self-promotion.
Read the code before you write the code
Most refactoring mistakes come from writing before understanding. A short method for mapping a codebase's real dependencies first.
Deep work in a fragmented day
You cannot always get four uninterrupted hours. Notes on making real progress in small, interrupted blocks.
