Mateusz Soltysik

A mysterious memory leak in production turned out to be caused by a bug in the OpenTelemetry Python library that only occurred in serverless environments, not during local testing.

Code review for the AI era. Five concrete shifts, anchored on the principles that didn’t change. PR template and reviewer prompt included.

“No known bugs” tells you where someone looked, not how the system behaves. Cloudflare’s worst outage in six years had no typo in it. Here is what to write instead.

A new MacBook exposed that my old one was the only copy of its own configuration, and it was not readable. What Nix actually fixed, what it did not, and a 13-line dev shell you can try on one repo without handing root to a blog post.

Most delivery dates fail before they’re spoken. They fail because someone treats a date as an input to planning, when it should be the output of one. The six-question test to tell the difference.

A primer on how insurance actually works - pooled risk, adjusters, reinsurance, and the parametric shift where satellites replaced humans. Written for engineers who touch financial systems or are just domain-curious.

Most projects don’t fail on execution. They fail because there was never a strategy to execute - just a wish wearing strategy’s clothes. Outcome = Strategy × Tactics, and zero times anything is zero.