Application Performance and Latency Analysis Questions

Techniques for diagnosing and improving application performance and latency across the stack. Topics include identifying latency sources at the application network and storage layers, interpreting latency distributions and percentiles including tail latency, using distributed tracing and request correlation to trace latency across services, profiling and hot path analysis, optimizing database queries and indexes, caching and cache invalidation strategies, batching and concurrency controls, instrumentation and sampling strategies, and defining latency objectives. Candidates should be able to walk through a performance regression investigation and propose targeted mitigations.