Design Google Meet

Section 1: Google Meet understanding

Google Meet must keep conversations natural under fluctuating network quality while maintaining strict meeting access controls. The answer quality comes from showing concrete invariants: who can join, when media is relayed, how retries stay safe, and how outages are contained.

Architecture lens

• Separate control plane from media plane for independent scaling.
• Keep APIs idempotent for all meeting mutations.
• Prioritize audio continuity before video fidelity.
• Attach every optimization to a p99 metric.

Trade-off rationale

An SFU-centric design supports medium and large meetings with bounded uplink cost at the sender. We reserve expensive operations such as compositing for recording pipelines rather than live paths. TURN capacity is provisioned for restrictive NAT environments, but direct peer transport remains preferred when policy and connectivity allow.

Operations and safety

Use SLO dashboards for join latency, frame freeze rate, packet loss, and reconnect success. During incident response, brownout optional features first: high-resolution layers, reactions, and background effects. Preserve join, audio, and moderator controls as critical path.

Interview delivery

State assumptions, sketch components, defend two major trade-offs, and close with failure handling. This structure communicates system ownership rather than feature memorization.

Why interviewers care

Google Meet interviews reward crisp scope, explicit trade-offs, and failure stories—not generic microservice diagrams.

Interview checkpoint

Name one failure story for Section 1: Google Meet Understanding that proves you understand real outages, not happy-path diagrams.