Stop by Stop

Watch real systems move data, one stop at a time.

Every topic is a metro line. Stations are the parts of a system, and the moving tag is the data riding between them. Press play and follow along. Made for interview prep, written so a first-timer can keep up.

Ride the Celery + Redis line

Network map of topics

HTTP journeyREST basicsFastAPI lifecycleAuth: JWT & OAuthCelery + RedisRedis deep-diveDatabasesGit basicsPull requestsDockerDocker ComposeCI/CDNginxKubernetesConcurrency vs parallelismProcesses vs threadsThe Python GILMultiprocessing poolsasyncio event loopRace conditions & locks
  • Backend line
  • Async & data line
  • DevOps line
  • Git line
  • Concurrency line

All lines

Backend line

Async & data line

DevOps line

Git line

Concurrency line