Stripe DevOps / SRE Interview Questions

1.Tell me about a time you built an internal tool or service for other engineers. What was your approach to making it easy to use?

2.Tell me about a time you had to choose between automating everything and leaving some manual processes. What was your reasoning?

3.Describe a time when you had to decide between a quick fix and a more thorough solution for a production issue. How did you make that call?

4.Walk me through a time when you encountered a production issue you couldn't immediately diagnose. What was your process?

5.Tell me about a complex infrastructure problem you had to explain to engineers from different teams. How did you make sure everyone understood?

6.Describe an observability or monitoring solution you built for other engineering teams. What made it effective?

7.You're deploying a change to our payments processing service that handles 100,000 transactions per minute. The deploy goes green but payment success rates start dropping from 99.9% to 95%. How would you approach this incident?

8.Write a script that monitors our Redis cluster health and automatically fails over to a backup instance if primary response times exceed our SLA. What would this look like?

9.We're seeing memory leaks in our Ruby services that process webhook deliveries to merchants. The services restart every few hours due to OOM kills. What's your debugging approach?

10.Our Kafka cluster that handles payment events is experiencing consumer lag during peak traffic. Messages are backing up and merchants aren't receiving webhooks in real-time. What's your investigation and resolution strategy?

11.Design a deployment system for Stripe's microservices that ensures we can safely roll out changes to payment processing without affecting transaction success rates. What would your architecture look like?

12.You need to migrate Stripe's merchant onboarding data from PostgreSQL to a new sharding scheme to support international expansion. How would you approach this migration without disrupting new merchant signups?

13.Design a circuit breaker service for Stripe Connect that protects our payment processing when a popular marketplace platform goes down and generates millions of failed webhook attempts. How would you prevent this from cascading to other Connect platforms?

14.We need to build a secrets rotation system for Stripe's API keys that can update keys across all our services without downtime. Walk me through your design for handling the millions of merchant API keys we manage.

15.Design the infrastructure for Stripe Radar's real-time fraud detection that needs to make accept/decline decisions on payment attempts within 100ms while processing data from billions of historical transactions. How would you handle this scale and latency requirement?

16.Build a global configuration management system for Stripe's feature flags that can propagate changes to all regions within 30 seconds while handling network partitions between data centers. How would you ensure consistency across our payment infrastructure?

17.Design the data pipeline infrastructure for Stripe Treasury that needs to reconcile bank transactions, generate account statements, and ensure FDIC compliance reporting while handling the transaction volume of a major bank. What would your architecture look like?

18.Design a capacity planning and auto-scaling system for Stripe's payment processing infrastructure that can handle Black Friday traffic spikes of 50x normal volume while maintaining sub-200ms API response times. How would you predict and prepare for these events?

19.Tell me about a time you had to convince a senior engineer or architect to change their approach when you didn't have formal authority over them. What was your strategy?

20.Describe a time when you had to communicate a complex infrastructure decision to product managers or other non-technical stakeholders. How did you approach it?

21.Tell me about a time you had to balance 'moving with urgency' on an infrastructure issue while ensuring you didn't create technical debt. How did you make that tradeoff?

22.Describe a situation where you had to get multiple engineering teams aligned on an infrastructure change that affected all of them. What was your approach to building consensus?

23.Tell me about a time you identified that your team was building the wrong solution for an infrastructure problem. How did you course-correct?

24.Describe a time when you had to raise the engineering bar on your team - either in code quality, operational practices, or technical rigor. How did you approach it without creating friction?

25.Estimate how much additional infrastructure cost Stripe would incur if we reduced our payment API latency from 200ms to 100ms across all regions. Walk me through your assumptions and calculations.

26.Estimate how many additional Kafka partitions Stripe would need to handle payment processing during a hypothetical global economic stimulus event that increases transaction volume by 500% for three months.

27.One of our Stripe Connect marketplace partners just onboarded 10,000 new merchants in a single day, and our webhook delivery system is struggling to keep up. How would you quickly assess the bottleneck and implement a short-term solution?

28.We're seeing a 15% increase in payment authorization failures specifically for international cards on Stripe Radar, but our fraud detection models haven't changed. The product team needs to understand if this is hurting legitimate merchants or actually catching more fraud. How do you analyze this?

29.Stripe Treasury customers are reporting that account balance updates are taking 2-3 minutes to reflect after ACH transfers complete, but our SLA promises under 30 seconds. The issue started yesterday with no recent deployments. How do you investigate?

30.Design a capacity planning system that can predict when Stripe's payment processing infrastructure will need additional database sharding based on merchant growth patterns and transaction velocity. What data would you use and how would you model future demand?