Measuring latency end to end: timestamp chains, one histogram, and the paint-time trick

I'm a full-stack engineer working mostly on backends and real-time systems: Python and FastAPI, Kafka and MQTT, Postgres and TimescaleDB, with React on the front end and CI and infrastructure around it. I write about what I build and break: the design trade-offs, the numbers I measured, and what I'd do differently. Now I'm moving into cloud and AI, and writing up what I learn along the way.