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How consistent hashing distributes keys across nodes so adding or removing a node only reshuffles a small fraction of the keyspace, with a virtual-node implementation in PHP and Python.
How to design an LRU cache that supports get and put in O(1) time using a hash map paired with a doubly linked list, with a working PHP implementation and a hands-on coding challenge.
Why idempotency keys matter in payment APIs, how to implement them safely with a database-backed store, and common pitfalls like race conditions and key collisions.
How relational databases detect deadlocks with wait-for graphs, why they happen, and concrete techniques to prevent them in high-concurrency systems.
Reduce your Docker image size dramatically using multi-stage builds.
Learn how to optimize database queries in Laravel by using eager loading to prevent N+1 query problems.
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