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Chang Qian
Senior Backend/Infrastructure Engineer specializing in large-scale integrity and content systems
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About
Backend/platform engineer who built Bilibili’s "Avalon" content moderation platform from a vague CEO mandate into a company-wide service (Go, gRPC, Kafka), including on-call, metrics, transparency tools, and multi-site resiliency work. More recently at Meta, scaled a high-traffic mistake-prevention platform by introducing capacity levers (prefiltering, caching, log sampling, fanout limits) and navigating org-wide constraints, including debugging a rule-engine threading bottleneck.
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Key Strengths
- End-to-end ownership of a production content moderation platform (scoping vague CEO request to rollout)
- Requirements discovery across multiple product teams; derived common sync/async moderation model
- Shipped first version in ~5 weeks and expanded platform coverage across many products
- Built operational foundations: on-call rotation, knowledge transfer, runbooks, biweekly stakeholder syncs
- Designed high-volume event pipeline with Kafka + gRPC, idempotency keys, stale-event protection, and isolated backfill service
- Capacity scaling via pragmatic levers (prefiltering, caching, log sampling, fanout limits) with explicit tradeoff management
- Diagnosed and resolved performance/data-quality issue traced to rule-engine thread pool exhaustion
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