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Engineer details multi-agent AI framework handling race conditions for fitness app

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Developer Duong Phuc Khanh engineered a system for the Winter Arc fitness app, which serves over 1,100 users from a single VPS. The app faced race conditions when hundreds of athletes logged workouts simultaneously at 6 AM in Da Nang, Vietnam. To prevent duplicate data and database locks, the team implemented an atomic distributed lock using Valkey/Redis and idempotency keys. Khanh also created a multi-agent orchestration framework to accelerate development, governed by a strict seven-step verification ladder.

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Engineer details multi-agent AI framework handling race conditions for fitness app · ShortSingh