What's the biggest production incident you've experienced that would have never been discovered by a traditional load test?, Would you rather have a system that occasionally serves stale data or one that occasionally goes down? Why?, At what point do retries become a bug rather than a feature?, Imagine you have enough budget to fix only one thing: caching, observability, load testing, retry logic. Which would you choose and why?, What's more dangerous in modern systems: bad code or bad assumptions about user behavior?, Have you ever seen a metric that looked healthy while the system was actually failing? What happened?, If ChatGPT suddenly recommended your product and traffic increased 100× within 10 minutes, what part of your architecture would worry you most?, Do you think most engineering teams spend too much time optimizing for average-case performance and not enough for worst-case scenarios?, What is the most expensive lesson you've learned about scalability or system design?, If you were interviewing a senior backend engineer, what question would you ask to determine whether they truly understand distributed systems and not just the theory?.

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