7 Site Reliability Engineer Interview Questions (with Sample Answers)
SRE interviews focus on reliability engineering: SLOs, error budgets, incident response, and capacity planning. The bar is reasoning about systems at scale under failure.
What to expect
- Expect Linux/networking deep-dives, system design, incident scenarios, and behavioral.
- SLO / error-budget literacy is non-negotiable above mid-level.
- Be specific about post-incident review processes and follow-up culture.
The questions
- 01 · Behavioral
Tell me about yourself.
Why interviewers ask this: For a SRE, this is your 60-second pitch. The interviewer is screening for clarity, signal, and fit.
How to answer: Use a Past → Present → Future structure: 1 sentence on background, 1–2 on current scope and a relevant win, 1 on why you want this role.
- 02 · Cultural Fit
Why are you interested in this role?
Why interviewers ask this: They are checking that you have read the JD and understand what makes this role and company different from generic alternatives.
How to answer: Tie 2 specific aspects of the role (a project, a stack, a customer segment) to 2 things you have actually done. Avoid flattery.
- 03 · Behavioral
Tell me about a time you failed.
Why interviewers ask this: Interviewers want to see how you handle real situations using the STAR method (Situation, Task, Action, Result).
How to answer: Pick a real failure with measurable consequences. Spend most of the answer on what you learned and the change you made afterward.
- 04 · Technical
Walk me through how you would set SLOs for a new service.
Why interviewers ask this: Tests whether you understand reliability as a product decision.
How to answer: Anchor on user-visible symptoms. Define SLI, target SLO, error budget, and what action triggers freeze. Mention how you would re-evaluate.
- 05 · Situational
A service is hot — CPU pegged at 100%. Walk me through your response.
Why interviewers ask this: Tests Linux/observability fluency under pressure.
How to answer: Mitigate (scale, shed load) first. Then triangulate: profiler, top, perf, eBPF. Look for hot loops, lock contention, GC pressure.
- 06 · Technical
How do you do capacity planning for a service?
Why interviewers ask this: Probes whether you forecast or just react.
How to answer: Cover headroom targets, growth projections, load testing, and how you handle unpredictable spikes.
- 07 · Behavioral
Tell me about the worst incident you owned.
Why interviewers ask this: Tests calm, blameless culture, and follow-up rigor.
How to answer: Cover detection, mitigation, customer comms, root cause, and the followups (tracking and closure). Quantify customer impact.
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