Application performance profiling, optimisation, and latency reduction.
Go 1.26 makes the Green Tea garbage collector the default. What actually changed, how to measure GC CPU before and after on your own workload, and the short window you have to opt out.
Slow JVM cold start breaks scale-to-zero and autoscaling. Three ways to fix it in 2026 — Project Leyden's AOT cache, GraalVM Native Image, and CRaC — with the exact commands, the trade-offs, and a decision framework.
Postgres EXPLAIN plans: node types, cost interpretation, and six patterns that kill query performance on large datasets.
Probabilistic drop rate limiting: uncoordinated enforcement bypassing Redis for 1M+ RPS with zero coordination overhead.
Java collections: computeIfAbsent, getOrDefault, removeIf, immutables, and Comparator chains that eliminate entire bug categories.
The features that changed Java: lambdas, streams, records, sealed classes, pattern matching, and virtual threads. Java 8 to 21.
How HTTP evolved from sequential text to multiplexed binary streams over QUIC. What each version solves and when to upgrade.
Production LLM API patterns: streaming, function calling, retries, token budgets, cost optimization, and observability for backend engineers.
B-tree internals, composite index ordering, GIN for full-text search, partial indexes, and preventing index bloat in production.
Java streams: pipeline internals, where streams beat loops, parallel stream traps, and when to use collectors vs teeing.