Q1. Describe a time you failed or a project did not go as planned.
Choose a failure that is real but not catastrophic, and focus on learning and corrective action. Situation: "I estimated a feature at two weeks; it took six." Task: "I ow...
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Q2. How do you prevent a cache stampede?
A stampede (thundering herd) happens when a popular key expires or is cold, and many concurrent requests all miss and hit the database at once, potentially overwhelming i...
Q3. How do you design for high availability across Azure availability zones and regions?
Start with RTO and RPO, then choose a topology. - Within a region, distribute workloads across availability zones, which are physically separate datacentres. Use zone-red...
Q4. Explain the circuit breaker pattern.
A circuit breaker stops a caller from hammering a failing dependency. It tracks failures and moves between three states: - Closed: calls pass through while failures stay ...
Q5. How do you design a multi-region failover architecture on AWS?
Design around an RTO and RPO first; they determine active-active versus active-passive. - DNS and traffic: Route 53 health checks with failover or latency routing, plus G...