Riot Games Site Reliability Engineer Interview: Rounds, Questions and Preparation

What the job involves

Site Reliability Engineers (SREs) at global tech companies ensure that large-scale, player-facing services stay fast, available, and reliable. Day to day, they build automation, monitor systems, respond to incidents, and improve infrastructure through code. At a gaming company like Riot Games, this means keeping live game services and backend systems running smoothly for millions of players worldwide.

Role and Technical Knowledge

1. 1

   What does an SRE do differently from a traditional sysadmin or DevOps engineer?

   Highlight the focus on software engineering to solve operations problems, error budgets, and SLOs. Mention that SREs automate to reduce toil and improve reliability.

2. 2

   Explain the difference between SLI, SLO, and SLA. Give an example from a gaming service.

   Define SLI as a metric (e.g., latency), SLO as a target (e.g., 99.9% of requests under 100ms), and SLA as a contract with consequences. Relate to player experience like matchmaking time.

3. 3

   How would you monitor a live multiplayer game for reliability issues?

   Discuss metrics like player concurrency, matchmaking latency, server error rates, and use of dashboards and alerts. Mention logging and tracing for debugging.

4. 4

   What is an error budget and how does it influence release decisions?

   Explain that it is the allowed amount of unreliability (1 - SLO). If exhausted, teams prioritize reliability over new features.

Practical Scenarios

1. 5

   A game server is experiencing high latency during peak hours. How do you troubleshoot?

   Start with checking metrics (CPU, memory, network), logs, and recent changes. Consider scaling, database bottlenecks, or DDoS. Communicate status to stakeholders.

2. 6

   You need to deploy a new version of a backend service with zero downtime. What strategy would you use?

   Mention blue-green or canary deployments, health checks, and rollback plans. Emphasize automation and monitoring during rollout.

3. 7

   How would you automate the provisioning of a new game environment?

   Use infrastructure as code (Terraform, Ansible), configuration management, and CI/CD pipelines. Highlight repeatability and version control.

4. 8

   Describe how you would handle a sudden spike in player traffic due to a viral event.

   Discuss auto-scaling, load balancing, caching, and capacity planning. Mention pre-warming and rate limiting if needed.

Behavioural and Situational

1. 9

   Tell me about a time you had to debug a complex issue under time pressure.

   Use STAR method: describe the situation, your systematic approach, the tools you used, and the outcome. Emphasize calmness and communication.

2. 10

   How do you prioritize tasks when multiple systems are alerting at once?

   Discuss impact assessment, severity levels, and following runbooks. Mention communicating with the team and documenting actions.

3. 11

   Describe a situation where you improved a process or automated a repetitive task.

   Focus on the problem, your solution (e.g., script, tool), and the measurable benefit like time saved or reduced errors.

4. 12

   How would you handle a disagreement with a senior engineer about a reliability fix?

   Show respect, data-driven discussion, and willingness to compromise. Emphasize the goal of system reliability over personal ego.

HR and Company Fit

1. 13

   Why are you interested in working as an SRE at a gaming company like Riot Games?

   Connect personal passion for gaming with the challenge of scaling systems for millions. Mention Riot's player-first values and global infrastructure.

2. 14

   How do you keep your technical skills up to date in a fast-changing field like SRE?

   Mention blogs, open-source contributions, online courses, and hands-on projects. Show curiosity and self-learning.

3. 15

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

   Express growth towards deeper technical expertise, mentorship, and contributing to reliability strategy. Align with company's career paths.

4. 16

   Are you comfortable with on-call rotations and handling production incidents?

   Acknowledge the responsibility, show willingness to learn, and mention strategies for staying effective under pressure.