Grokking Modern API Design Interview
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The Reliability Contract

A partner engineer asks:

"How long should our client wait before giving up?"

Nobody can answer. One caller waits two seconds. Another waits two minutes. A gateway gives up at 30 seconds. The server sometimes continues working after all three have left.

Reliability is not the statement "the service is highly available." It is a set of caller-visible promises about duration, failure, retry, partial outcomes, availability, and latency.

1. Publish the Longest an Operation May Take

Different operations need different deadlines:

GET  /payments/{payment_id}   2 seconds

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