1 min lesson
Reliability engineering at scale
Walk through each part of "Reliability engineering at scale", then explain what each one does.
Step 1 of 3
Auth, webhooks, the agent backend and SCM all run for a tool with a very large daily developer base. Reliability here is not a quality of the system - it is the personal responsibility the JD assigns to this role.
The mature way to talk about reliability is in budgets, not absolutes. You don't promise five nines on everything; you set a target per service and spend the remaining error budget on velocity. That framing alone reads as senior.
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Full explanation
Containing failure
Containing failureblast-radius discipline
One failing dependency must not take the product with it. Circuit breakers, timeouts and bulkheads keep a slow SCM provider or a degraded model from cascading into auth or the editor.
- Circuit breakers around every external dependency, so a hung provider fails fast instead of consuming the thread pool.
- Aggressive timeouts plus bounded retries with backoff and jitter - retries without jitter synchronize into a thundering herd.
- Bulkheads: isolate resource pools per dependency so one saturated integration can't starve the others.
- Graceful degradation paths defined per feature, so the answer to "GitHub is down" is a known reduced mode, not a guess.