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Spring controllers accumulate logic because they're the most visible layer and the easiest place to add code. The result is controllers that are hard to test, hard to reuse, and hard to change. Here is a clear boundary that scales.
Read moreLoad balancers are simple in concept and full of operational surprises in practice. Understanding what they actually do — and what they assume about your application — prevents a category of production incidents that look mysterious until they aren't.
Read moreMid-level developers often bring strong implementation skills into system design conversations and apply the wrong mental model. The gaps are predictable, and fixing them is less about knowledge than about shifting the frame.
Read moreSpring's @Transactional annotation hides significant machinery: proxy creation, connection management, propagation behavior, and rollback rules. The bugs that come from misunderstanding this machinery are among the hardest to diagnose in Spring applications.
Read moreThe gap between a €50 rate and a €150 rate is not three times the technical skill. It is a specific combination of positioning, communication, and demonstrated value that most contractors are never taught to build.
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