Why Engineering Teams Need a Dedicated Reliability Engineer After 20 Staff

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Engineering teams that treat reliability as a shared responsibility often find it becomes no one's priority, especially when feature deadlines take precedence. A dedicated reliability engineer focuses on metrics like error budgets and latency drift, runs post-mortems, enforces SLO tracking, and builds tools that improve team-wide stability. The role is best suited to a mid-level engineer with real production crisis experience, rather than a senior infrastructure engineer or a new hire. Experts suggest hiring for this role once a team reaches around 20 engineers, at which point informal reliability ownership tends to break down. The financial case is straightforward: a single major outage avoided can justify the cost of the hire several times over.

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