I Built a Production-Grade Async Job Queue from Scratch — Here's Everything That Actually Happened

A real account of building an Async Job Queue with Backpressure & Priority Scheduling using Python, FastAPI, and Redis Streams — covering the Reaper service, 47 tests, 85% coverage, and every bug along the way. No Celery. No shortcuts. No pretending the first approach worked. I decided to build a production-grade project from scratch to bypass the abstraction layer of tools like Celery and truly master backend internals—the kind of work you can defend in any technical interview. Instead of reach