Async/await, event loops, and concurrency patterns compared across Node.js and Python in 2026, with benchmarks and the pitfalls that cause production incidents.
Blue-green deployment strategy explained: zero-downtime rollouts, database migration safety, and rollback design for production systems.
Redis vs Memcached in 2026: data structures, persistence, clustering, and which caching strategy (cache-aside, write-through, write-behind) fits each.
Practical CDC implementation guide comparing Debezium, log-based vs trigger-based capture, and production pitfalls for 2026.
Chaos engineering in 2026: fault injection tools, blast radius control, and interview-ready resilience patterns.
Circuit breakers and bulkheads explained with real thresholds, failure math, and the interview questions that separate theory from production experience.