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NVIDIA·Software Engineer·Onsite - System Design / Architecture·Intermediate

Intermediate
Apr 2026

Summary

Nvidia SWE interview with a system design question. Pretty open-ended, which I wasn't fully expecting for something that sounds so simple on the surface.

Questions Asked (1)

Q1

Design a system for a rock paper scissors game.

System DesignTechnical Trade-offs
Author's notes

My first instinct was to treat this like a toy problem and just sketch out some classes.

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AI HintsAI Generated

Suggested Approach

Start by clarifying the scope: is this a simple local game, a networked multiplayer game, or a scalable service? Then design the core game logic, state management, and APIs, and discuss trade-offs for scalability, latency, and fault tolerance. Finally, consider how to leverage NVIDIA's strengths in accelerated computing for AI opponents or high-performance simulations.

Pro tip: Emphasize that even a simple game like rock-paper-scissors can be a vehicle to discuss distributed systems, concurrency, and AI—showing you can think beyond the basics. Also, proactively mention how you'd test and monitor the system, as reliability is crucial at NVIDIA.

1. Clarify Requirements and Scope

Ask questions to determine if the game is single-player vs AI, multiplayer networked, or a massively scalable service. Clarify expected load, latency requirements, and whether persistence or leaderboards are needed.

2. Design Core Game Logic and Data Model

Define the rules, move representations, and outcome determination. Outline the data model for games, players, and moves, and decide on stateless vs stateful components.

3. Architect the System and APIs

Propose a high-level architecture: client, API gateway, game service, matchmaking, and storage. Define key APIs for creating games, submitting moves, and retrieving results.

4. Address Scalability, Concurrency, and Fault Tolerance

Discuss how to handle concurrent games, ensure consistency (e.g., using optimistic locking or queues), and scale horizontally. Consider replication, sharding, and handling failures gracefully.

5. Discuss Trade-offs and NVIDIA-Specific Optimizations

Compare design choices (e.g., WebSockets vs polling, SQL vs NoSQL) and highlight how NVIDIA GPUs could accelerate AI opponents or large-scale simulations. Mention monitoring, logging, and testing strategies.

Key Points to Mention

  • Game state management and consistency (e.g., using a state machine or event sourcing)
  • API design (REST vs WebSocket) and real-time communication for multiplayer
  • Scalability patterns: load balancing, sharding, and caching
  • Concurrency control: optimistic vs pessimistic locking, idempotency
  • AI opponent integration and potential GPU acceleration for inference
  • Testing, monitoring, and deployment strategies (CI/CD, canary releases)

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.