Site Reliability Engineer (SRE) interview questions & mock practice
A Site Reliability Engineer (SRE) interview in 2026 runs across 4 rounds — linux & systems, coding / scripting, reliability & system design, incident & on-call. Below are the most-asked Site Reliability Engineer (SRE) interview questions and a focused prep plan. Rehearse every answer with OnJob's free AI mock interview and get instant, specific feedback before the real one.
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The Site Reliability Engineer (SRE) interview process
Linux, observability, incident response and automation — the reliability-focused engineering interview at Indian product companies, fintech and cloud-native startups.
Linux & systems
Operating system internals, networking, processes and command-line troubleshooting.
Coding / scripting
Python or Go scripting, automation and a DSA-lite problem.
Reliability & system design
Designing for scale, redundancy, SLIs/SLOs and failure modes.
Incident & on-call
Debugging a production outage, observability and postmortem culture.
Most-asked Site Reliability Engineer (SRE) interview questions
13 of the questions Site Reliability Engineer (SRE) candidates are asked most often in India. Practise answering each one out loud in your AI mock interview.
- 1. What is the difference between an SLI, an SLO and an SLA?
- 2. What is an error budget and how does it influence release decisions?
- 3. Walk me through debugging a server where CPU is at 100 percent.
- 4. What happens, step by step, when a request goes from a browser to your service?
- 5. What is the difference between TCP and UDP, and how does the TCP handshake work?
- 6. How do you troubleshoot high latency in a distributed system?
- 7. Explain the difference between load balancing strategies like round-robin and least-connections.
- 8. What are the four golden signals of monitoring?
- 9. How would you design a system to achieve 99.99 percent availability?
- 10. What is the difference between horizontal and vertical scaling?
- 11. How do you find which process is consuming disk or memory on a Linux box?
- 12. What is a blameless postmortem and why does it matter?
- 13. How do you handle secrets and configuration across environments?
How to prepare for your Site Reliability Engineer (SRE) interview
Be deep on Linux and networking: process and memory inspection, top/htop/strace/ss, DNS, TCP/IP and the full path of a request.
Know the SRE vocabulary cold: SLIs, SLOs, SLAs, error budgets, toil and the four golden signals.
Be comfortable scripting automation in Python or Go and reasoning about idempotency and safe rollouts.
Understand observability and incident response: metrics vs logs vs traces, alerting design, and writing blameless postmortems.
Prepare a real outage story using STAR — what broke, how you triaged, the fix, and the long-term prevention.
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Site Reliability Engineer (SRE) interview — FAQs
What questions are asked in a Site Reliability Engineer (SRE) interview?
Common Site Reliability Engineer (SRE) interview questions include: What is the difference between an SLI, an SLO and an SLA? What is an error budget and how does it influence release decisions? Walk me through debugging a server where CPU is at 100 percent. What happens, step by step, when a request goes from a browser to your service? Interviews usually run across 4 rounds — Linux & systems, Coding / scripting, Reliability & system design, Incident & on-call. Practice all of them with instant AI feedback using OnJob's free mock interview.
How many rounds are in a Site Reliability Engineer (SRE) interview?
A typical Site Reliability Engineer (SRE) interview has 4 rounds: Linux & systems (Operating system internals, networking, processes and command-line troubleshooting.); Coding / scripting (Python or Go scripting, automation and a DSA-lite problem.); Reliability & system design (Designing for scale, redundancy, SLIs/SLOs and failure modes.); Incident & on-call (Debugging a production outage, observability and postmortem culture.).
How do I prepare for a Site Reliability Engineer (SRE) interview?
To prepare for a Site Reliability Engineer (SRE) interview: Be deep on Linux and networking: process and memory inspection, top/htop/strace/ss, DNS, TCP/IP and the full path of a request. Know the SRE vocabulary cold: SLIs, SLOs, SLAs, error budgets, toil and the four golden signals. Be comfortable scripting automation in Python or Go and reasoning about idempotency and safe rollouts. Then run a full AI mock interview on OnJob to rehearse out loud and get instant, specific feedback before the real thing.
What skills do I need for a Site Reliability Engineer (SRE) role?
Core Site Reliability Engineer (SRE) skills tested in interviews include Linux, Networking, Kubernetes, Observability, Python, Terraform, CI/CD, Incident Response. OnJob shows you exactly which of these skills stand between you and a 100% match on every live Site Reliability Engineer (SRE) job.
Is OnJob's Site Reliability Engineer (SRE) mock interview free?
Yes. OnJob's AI mock interview is free to start (₹0) and gives you instant feedback on your answers. Pro (₹99/month) adds unlimited interview-prep AI alongside recruiter tracking and unlimited applications.
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