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Distributed Task Scheduler

The infrastructure layer behind cron-as-a-service, delayed jobs, and workflow engines — where reliability matters more than raw speed. Build a service that runs jobs at a scheduled time or on a recurring cadence, across a fleet of worker machines, without ever running the same job twice or losing a job when a worker crashes mid-execution.

~11h

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Intro

What you're building

A service that runs jobs at a scheduled time or on a recurring cadence, across a fleet of worker machines, without ever running the same job twice or losing a job when a worker crashes mid-execution.

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Step 1 — Model jobs as durable state, not in-memory timers

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Step 2 — Let multiple workers pull jobs without double-processing

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Step 3 — Recover from a worker dying mid-job

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Step 4 — Add retries with backoff

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Step 5 — Support recurring schedules

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Secret Mission

Secret Mission: kill a worker on purpose

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Wrap Up

What you learned

Pro

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