How we built a small Python smoke test tool for a safety-critical alarm backend: a 300-line harness, one package per feature, blocker ordering, honest SKIPs, simulators, and the regression it caught.
Lessons from upgrading Docker Engine and moving from docker-compose v1 to the Compose plugin on production hosts: restart policies, legacy links, env-file interpolation, and the five-year-old cron job that took the API down.
A real migration from a pool of RQ worker processes to a single asyncio job engine: leases instead of a coordinator, batching instead of one request per job, the MySQL deadlock it caused, and load-test numbers.
A real Flask to FastAPI migration of a production service with REST and WebSocket: the phased plan, keeping the API contract identical, sync vs async handlers, WebSocket pitfalls, and the load-test results.
A practical Django 5.2 to 6.0 upgrade of a production API: why tests came before the upgrade, what DRF 3.17 dropped, a migration drift check, and how we pruned 25 unused packages along the way.
Understand ProxySQL hostgroups: what they are, how they route MySQL traffic, common use cases, pitfalls, Galera cluster integration, and running multiple ProxySQL instances across data centers.
A practical guide to migrating Python code from ThreadPoolExecutor to asyncio. Learn when to migrate, step-by-step refactoring patterns, common pitfalls, and how to handle blocking code that can't be made async.
Learn how to use ProxySQL as a connection pooler between PHP applications and MySQL, dramatically reducing connection overhead and improving database scalability.
A deep dive into the new APIs and libraries in Java 25, including Scoped Values, the Key Derivation Function API, Stable Values, PEM Encodings, and the Vector API.
The gap between senior and junior AI usage isn't about knowing more prompts. It's the same gap that existed with Google: seniors know what they need, juniors hope the tool figures it out for them.