This System Design question evaluates a candidate's ability to design scalable, real-time matchmaking and waiting-queue systems, encompassing architecture, data modeling, distributed coordination, concurrency control, reliability, and trade-offs between match quality and latency.
You are designing the matchmaking system for a large real-time multiplayer game. Players join a waiting queue and are matched into games under constraints such as team size, region, and skill level.
Assume a global player base with multiple regions, multiple game modes (e.g., 1v1, 3v3, 5v5), and peak spikes. Target low wait times and high match quality.
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