The Gridiron of
System Design
Don't practice on the interviewer. Scrimm AI is your toughest scrimmage. It's not a sideline assistant—it's the opposing defense here to sack your design. Drill with an intelligent agent that blitzes your architecture, grills you on trade-offs, and forces you to execute a flawless playbook.
Trusted by 500+ engineers preparing for FAANG interviews
Stop Paying $160/hr for Mock Interviews
The same pressure. The same feedback. A fraction of the cost.
Don't Fumble the Design.
The AI is watching the ball.
Scrimm AI isn't here to be your friend. It's the coordinator that ensures you're ready for the Sunday start. 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 Your Scrimmage Works
Study the Playbook
Choose from classic system patterns like "Design Netflix", "Design a Rate Limiter", or "Design Uber".
Step into the Pocket
Use the interactive whiteboard to sketch your architecture while explaining your logic via voice.
Handle the Blitz
The AI probes weak points, throws curveball constraints, and asks about edge cases in real-time.
Final Scoreboard
Receive an instant scorecard grading your design, requirements gathering, and deep dive execution.
Choose Your Game Plan
The pressure of game day, or a guided film session. Pick the mode that matches where you are.
Interview
Mode
A skeptical senior engineer who brings the blitz. Your score counts. No hand-waving allowed.
Tutor
Mode
A patient coach who nudges you forward. Hints on demand. No score pressure.
Toolbar
Transcript
Both modes cost 1 credit per session
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
Is this better than ChatGPT?
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.
What topics are covered?
We cover the most common system design interview questions found at FAANG companies, including scalable web applications, distributed data stores, and real-time systems.
Do I need a microphone?
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.
Can I save my sessions?
Absolutely. All your interview sessions, including the transcript and the whiteboard state, are saved so you can review your "game tape" later.
Ready for Your First Scrimmage?
15 free interviews every month. No credit card required.
Starter
No credit card required
- ✅ Basic System Design Topics
- ✅ Standard AI Feedback
- ✅ Voice + Whiteboard
Pro
For serious interview prep
- 🔥 Unlimited Credits
- 🔥 Priority AI Response
- 🔥 Advanced Topics & Scenarios
- 🔥 Detailed Score History