System designHardsd-g693

Subject Game netcode networkingLevel Senior–Staff~50 minCommon in Networking & APIs interviewsIndustries Computer games, Technology

Question

Design the authoritative netcode backend for a real-time competitive shooter with 64-player matches, a 64 Hz server tick, and a hard budget of <80 ms end-to-end input-to-render under typical 40 ms RTT. Players spread across regions; you must run thousands of concurrent match instances. Cover the transport, how the simulation stays authoritative, how clients hide latency, and how you keep cheaters from forging movement.

What a strong answer looks like

Clarify scale and constraints first. Propose a clean component breakdown, then go deep on the hard parts — data model, bottlenecks, consistency, failure modes — and name the trade-offs you are making.

Learn the concepts

Narrate your design

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Run or narrate your approach, then ask the coach.