Show HN：AI 驅動的系統設計面試練習平台

System Design Scrimmage for Engineers

The only AI-powered mock interview platform for senior engineers. Drill with an intelligent agent that watches your whiteboard, challenges your trade-offs, and grades your distributed system architecture in real-time.

Live Defense

Scrimm AI watches your whiteboard in real-time. It doesn't just nod along—it attacks your design. If you introduce a single point of failure, choose the wrong consistency model, or make an unrealistic latency assumption, the AI interrupts immediately. You'll have to justify your trade-offs, explain your sharding strategy, and prove your system can handle the load against a skeptical interviewer who knows exactly when you're hand-waving.

Voice Sparring

Simulate the high-pressure environment of a real technical loop. Speak your trade-offs out loud and defend your choices against an AI that won't take "it scales" for an answer.

Game Tape & Stats

Get an instant post-game analysis of your performance. We break down your session into core competencies like Scalability, API Design, and Data Modeling so you know exactly where to drill next.

Instant Feedback

No more waiting days for interview results. Get a comprehensive scorecard and detailed feedback the second your session ends.

Don't just draw boxes. Your interviewer will catch it.

Scrimm AI isn't here to be your friend. It's here to ensure you're ready for the real thing. If you skip critical components or fail to justify your trade-offs, you'll get the same feedback you'd get in a real loop:"Insufficient substance to evaluate a comprehensive design."

How Scrimm Works

Choose from classic interview questions like "Design Netflix", "Design a Rate Limiter", or "Design Uber".

Use the interactive whiteboard to sketch your architecture while explaining your trade-offs via voice.

The AI acts as a senior interviewer, interrupting to probe weak points and ask about edge cases.

Receive an instant scorecard grading your requirements gathering, high-level design, and deep dive.

Master Every Distributed System Pattern

Capacity Calculator

Perform back-of-the-envelope calculations instantly. This tool is built into the interview interface.

Frequently Asked Questions

Yes. While you can chat with standard LLMs, they cannot simulate the actual interview environment. A real system design interview is a multimodal challenge: you must draw architecture diagrams on a whiteboardwhile explaining your thought process. Scrimm.ai provides this exact environment. Our AI "sees" your diagram in real-time and challenges your specific visual design choices—like where you placed that load balancer—creating a realistic simulation that text-based chat simply cannot match.

We cover the most common system design interview questions found at FAANG companies, including scalable web applications, distributed data stores, and real-time systems.

Yes. The core of the platform is the voice-based interaction to simulate a real conversation. We recommend using a headset for the best experience.

Absolutely. All your interview sessions, including the transcript and the whiteboard state, are saved so you can review your "game tape" later.

Practice More, Pay Less

Get 50 reps in before you pay a human for the final polish. Join the private beta to start your first scrimmage.

Scrimm.ai

The AI-powered scrimmage for system design interviews. Drill architecture until it's muscle memory.

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