Practical backend & system design writing — every article carries diagrams, real code and hard-won trade-offs.
Poll timeouts, session windows and the silent cost of a slow consumer — a mental model for stable consumer groups, drawn out step by step.
Choosing a shard key, and the migration nightmares that follow the wrong one.
The two hard problems — and a model that makes the first one easy.
Hash ring vs modulo, virtual nodes, and why one dead node shouldn't reshuffle the world.
The two algorithms, distributed limits with Redis, and the 429 that saves you.
Why "retry-safe" APIs need them and how to store them without double-charging.
B+tree rules, composite index order, covering indexes, and when an index hurts writes.
No fluff, no daily spam — one solid backend read, whenever it ships.
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