Design Online Chess Matchmaking
Company: OpenAI
Role: Software Engineer
Category: System Design
Difficulty: hard
Interview Round: Technical Screen
Overview: This question evaluates a candidate's ability to design scalable, low-latency matchmaking backend systems, covering distributed service decomposition, queuing and worker mapping, state ownership, progressive widening of search criteria, and concerns like concurrency, duplicate requests, cancellations, failures, fairness, scalability, and observability. It is commonly asked to assess architectural trade-offs in real-time distributed systems and the capability to apply system design principles to operational requirements; category: System Design; level of abstraction: practical application grounded in conceptual architectural understanding.