Software engineer, remote from Greece. Enterprise AI platforms, agentic workflows, code review agents, and the Python backends that keep it all upright — plus a past life automating tests for cars.https://ochotzas.com/https://ochotzas.com/notes/prompt-tests-that-cost-nothing/https://ochotzas.com/notes/prompt-tests-that-cost-nothing/PromptKit 1.0 is out: prompts as files, a linter that finds the typo before your invoice does, and eval suites that run in CI with no API key and no bill.Thu, 17 Sep 2026 00:00:00 GMTllmpythontoolingpromptkithttps://ochotzas.com/notes/the-value-of-a-closed-feature-request/https://ochotzas.com/notes/the-value-of-a-closed-feature-request/My library has a page listing what it will never do. It's the most useful page in the docs, and it's the reason people can adopt it.Tue, 18 Aug 2026 00:00:00 GMTdesignopen-sourcellmhttps://ochotzas.com/notes/rendering-a-prompt-you-did-not-write/https://ochotzas.com/notes/rendering-a-prompt-you-did-not-write/The moment prompts become files, they arrive from places you don't control. A template engine with defaults on is a code-execution primitive.Tue, 30 Jun 2026 00:00:00 GMTllmsecuritypythonhttps://ochotzas.com/notes/the-prefix-match-that-tripled-the-bill/https://ochotzas.com/notes/the-prefix-match-that-tripled-the-bill/A cost estimator that is confidently wrong is worse than one that says it doesn't know. How a two-line convenience priced Opus 4.5 as Opus 4.Tue, 26 May 2026 00:00:00 GMTllmdesigntoolinghttps://ochotzas.com/notes/a-version-number-is-not-an-identity/https://ochotzas.com/notes/a-version-number-is-not-an-identity/Every prompt file has a version field. Nobody bumps it. Hash the content instead, and your cache stops lying to you.Tue, 14 Apr 2026 00:00:00 GMTllmcachingdesignhttps://ochotzas.com/notes/prompts-belong-in-version-control/https://ochotzas.com/notes/prompts-belong-in-version-control/A prompt is not a string. It's a dependency with a price tag, and it belongs somewhere you can review it, diff it and roll it back.Tue, 27 Jan 2026 00:00:00 GMTllmpythontooling