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Most Java applications use PostgreSQL as a dumb key-value store with SQL syntax. PostgreSQL has capabilities that eliminate entire categories of application code — JSONB for flexible schemas, full-text search, window functions, advisory locks, and LISTEN/NOTIFY for real-time events.
Read moreA Spring Boot application that starts successfully is not production-ready. Health checks, structured logs, metrics, and distributed traces are the four pillars of observability that turn a running application into a diagnosable one.
Read moreThe Java Memory Model defines precisely which writes are visible to which reads, and under what conditions. Without understanding it, thread-safe code is guesswork. With it, the correct tool for each situation becomes clear.
Read moreRails callbacks are one of the most powerful and most regretted features in the framework. The difference between callbacks that help and callbacks that haunt you is a small set of rules applied consistently.
Read moreRails concerns are one of the most misused features in the framework. Used correctly they share behavior cleanly across unrelated models. Used as a refactoring tool they just relocate complexity without reducing it.
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