slo

Averages lie, and interviewers know most candidates quote them anyway. The fastest way to sound production-grade in any latency discussion is to reason about percentiles correctly, including the one trap almost everyone falls into.

Uptime and latency are the easy SLIs. The hard ones are whether the case was actually resolved, which you only learn days later, and what to do with an action that must never happen, which no error budget should cover.

Two hard numbers in the contract: 95% accuracy and $0.50 per resolution. The job is an eval and rollout system that proves both hold on real traffic before you scale, with rollback triggers wired to the same numbers.