Pardot India Site Reliability Engineer Interview: Rounds, Questions and Preparation

What the job involves

Site Reliability Engineers keep large-scale production systems reliable, fast, and cost-effective. They blend software engineering with operations: building automation, monitoring, and incident response for services used by millions. In global tech firms or fast-growing SaaS companies, freshers in this role often start by improving observability, writing runbooks, and automating repetitive tasks.

Role and Technical Knowledge

1. 1

   What is the difference between a Site Reliability Engineer and a traditional DevOps or sysadmin role?

   Explain that SRE applies software engineering to operations, with error budgets, SLOs, and automation. Mention that sysadmins focus on manual upkeep while SREs reduce toil through code.

2. 2

   Explain the three pillars of observability and give an example of each in a web service.

   Cover metrics (e.g., CPU usage, request latency), logs (e.g., error stack traces), and traces (e.g., request flow across microservices). Give a concrete example like debugging a slow checkout page.

3. 3

   What is an SLO and how does it relate to an SLA and SLI?

   Define SLI as a measured indicator (e.g., 99th percentile latency), SLO as an internal target, and SLA as a customer-facing contract. Explain that SLOs drive alerting and error budgets.

4. 4

   How would you use a load balancer and health checks to keep a service available?

   Describe distributing traffic across healthy instances, removing unhealthy ones via health checks, and using multiple availability zones. Mention graceful degradation and failover.

Practical Scenarios and Troubleshooting

1. 5

   A production API is returning 500 errors for 10 percent of requests. Walk me through your debugging steps.

   Start with dashboards and recent changes, check logs for stack traces, isolate by endpoint or region, and verify dependencies. Suggest rolling back if a recent deploy is the cause.

2. 6

   How would you automate the deployment of a Python web app to a cloud VM?

   Outline a CI/CD pipeline using Git, a build step, and a deployment script or tool like Ansible. Mention environment variables, secrets management, and rollback strategy.

3. 7

   You need to reduce alert noise from a service that pages the on-call engineer too often. What do you do?

   Propose tuning thresholds, adding alert grouping, and using SLO-based alerts instead of raw metrics. Suggest a weekly review of noisy alerts and creating runbooks.

4. 8

   Describe how you would set up monitoring for a new microservice from scratch.

   Cover choosing metrics (latency, error rate, throughput), setting up dashboards, defining SLOs, and configuring alerts. Mention logging and distributed tracing for deeper debugging.

Behavioural and Situational Questions

1. 9

   Tell me about a time you had to learn a new technology quickly for a project or college assignment.

   Use the STAR method: describe the situation, the technology, how you learned it, and the outcome. Highlight self-learning and practical application.

2. 10

   How would you handle a situation where you are on call and a critical service goes down at 2 AM?

   Show calm prioritisation: acknowledge the alert, check dashboards, follow runbooks, communicate status, and escalate if needed. Mention documenting the incident afterwards.

3. 11

   Describe a time you worked in a team to solve a technical problem. What was your role?

   Focus on collaboration, clear communication, and your specific contribution. Mention any tool like Git or Slack used to coordinate.

4. 12

   Why do you want to work as a Site Reliability Engineer, and how do you handle repetitive tasks?

   Express interest in automation and system reliability. Give an example of automating a boring task with a script, showing you value reducing toil.

HR and Company Fit

1. 13

   What do you know about our company and why do you want to join us?

   Research the company's product, scale, and engineering blog. Connect your skills to their reliability challenges and show enthusiasm for their mission.

2. 14

   Are you comfortable with on-call rotations and working in shifts if required?

   Be honest but positive. Mention you understand the responsibility and are willing to learn how to manage stress and escalate properly.

3. 15

   Where do you see yourself in three years as an SRE?

   Show a growth path: from handling incidents to designing reliable systems, automating, and mentoring. Align with the company's SRE career ladder.

4. 16

   How do you keep your technical skills updated outside of college?

   Mention blogs, open-source contributions, online courses, or personal projects. Give a recent example of something you learned and applied.