Backend engineer in Lviv. Python, FastAPI, PostgreSQL. Ten years of server code, and notes on the layer below the question.https://serhovskyi.com/en-ushttps://serhovskyi.com/writing/mechanisms-not-agreements/https://serhovskyi.com/writing/mechanisms-not-agreements/263 green tests, a green type-check, and every value on screen read undefined. Generated OpenAPI types, ESLint boundaries and import-linter — what actually goes red, and when.Sun, 16 Aug 2026 00:00:00 GMT