Game Server Architecture and Deployment Questions

Architecture and deployment patterns for online game backends including dedicated servers, authoritative server models, hosted service architectures and serverless components; regional and multiregion deployment strategies to minimize player latency; session and connection management, state synchronization, tick rate and authoritative state design; load balancing, sharding and matchmaking strategies; scaling techniques including autoscaling, predictive scaling and warm pools; graceful shutdown, handoff and reconnection handling to preserve player experience; networking considerations such as UDP versus TCP, NAT traversal and rate limiting; deployment, CI CD and observability practices for game services, and trade offs between latency, consistency, cost and operational complexity.

EasyTechnical

83 practiced

Summarize NAT traversal approaches relevant to multiplayer games: STUN-based UDP hole punching, TURN relay servers, and server relay (game server acting as a proxy). For each approach note typical cost, latency impact, success rates against different NAT types (symmetric vs cone), and when you would choose that approach.

MediumSystem Design

59 practiced

Design a load balancing approach for UDP-based game servers running on Kubernetes. Explain why L4 vs L7 is relevant for UDP, how to maintain session affinity so all packets from a client hit the same Pod (IP:port hashing, ExternalTrafficPolicy, MetalLB), and how to implement health checks and rolling updates without dropping active sessions.

MediumTechnical

82 practiced

Describe an implementation plan for enabling NAT traversal (STUN) and TURN fallbacks in a cross-platform multiplayer game. Explain client candidate gathering, candidate prioritization, preferred connection attempts (UDP hole punching), fallback to TURN relay, metrics to collect (success rate, RTT), and how to incorporate TURN cost into product decisions.

EasySystem Design

74 practiced

Describe a robust session and connection management approach for multiplayer games. Include authentication flow (token issuance), token lifetime and refresh, reconnect tokens or resumable sessions, heartbeat/keepalive strategy, and how to handle sudden client disconnects to preserve player experience (e.g., short grace period, AI takeover, spectator mode).

MediumTechnical

68 practiced

How would you design rate limiting for in-game actions (e.g., ability casts, chat messages) to prevent abuse while minimizing false positives? Discuss server-side token-bucket vs leaky-bucket options, per-user and per-IP limits, exemptions for privileged users, and techniques to handle clients behind NAT that share an IP.

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