Testing and Scalability Challenges Questions

Measure the candidate awareness of quality assurance and testing issues specific to large scale products and high user volume environments. Topics include test strategy and coverage at scale, automated testing and continuous testing pipelines, performance and load testing, system and integration testing for distributed systems, test data management, observability and monitoring to validate behavior in production, staged rollouts and canary testing, and organizational practices for maintaining testability as systems grow. Candidates should be able to reason about trade offs between testing speed and coverage, and propose scalable approaches to validate reliability and correctness for very large user bases.