Notes on system design, AI, and fintech engineering — from someone building all three.https://miguec.dev/https://miguec.dev/posts/locking-concepts/https://miguec.dev/posts/locking-concepts/Optimistic vs pessimistic locking for concurrent updates, with a JPA @Version walkthrough.Sat, 27 Sep 2025 09:36:27 GMTsystem-designconcurrencyjava