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Jan 2, 2026 · Information Security

How We Built a High‑Performance, Low‑Cost Content Moderation System with Trie + Aho‑Corasick

Faced with minutes‑long posting delays and exploding review costs in a fast‑growing social app, the team introduced 24‑hour shift staffing, a local blacklist stored in MySQL, an in‑memory Trie + Aho‑Corasick matcher, Redis‑driven hot updates and a machine‑audit fallback with a feedback loop, dramatically cutting latency, cost and false‑positives.