AI Mock System Design Interview Master Interviews Before the Real One

The AI system design simulator built for serious interview prep. Practice with realistic mock interviews, get instant feedback on architecture decisions, and ace your next interview at FAANG and top tech companies.

Why Do Smart Engineers Fail System Design Interviews?

It's not about lacking technical knowledge—it's about interview execution

Panic Under Pressure

You know the concepts but freeze during the 45-minute window.

No Structure

Jump straight to code without gathering requirements or discussing trade-offs.

No Real Practice

$200 mock interviews don't replicate the real pressure and constraints.

Vague Feedback

Generic advice like "think out loud" doesn't help you improve.

See How It Works

Experience a realistic system design interview simulation.

Everything You Need to Master System Design

Built for engineers who want to pass their interviews on the first try.

Realistic Pressure

45-minute timed sessions with an AI interviewer that interrupts, challenges, and applies real interview pressure.

Smart Signal Tracking

Monitors if you covered requirements, discussed scale, proposed APIs, and identified trade-offs in real-time.

Actionable Feedback

Detailed performance breakdown across multiple dimensions. Know exactly what you missed and how to improve.

Multiple Practice Cases

Practice with curated cases based on real FAANG interviews. URL shortener, social feeds, streaming, and more.

Whiteboard Integration

Visual diagram editor to draw architecture diagrams during the interview. Export and review them later.

Progress Tracking

Dashboard with all past interviews. See your improvement over time and review transcripts and diagrams.

Start Free, Upgrade When Ready

Choose the plan that works for you. All credits never expire.

Starter Pack

Perfect for trying out the platform

  • $9
  • 3 interview simulations
  • AI-powered interviewer
  • Real-time feedback
  • Detailed performance report
  • Credits never expire

Power Pack

Best value for comprehensive prep

  • $12
  • 5 interview simulations
  • AI-powered interviewer
  • Real-time feedback
  • Detailed performance report
  • Credits never expire
  • Best value per interview

Pro Unlimited

Unlimited practice for serious prep

  • $49/month
  • Unlimited interviews
  • AI-powered interviewer
  • Real-time feedback
  • Detailed performance reports
  • Cancel anytime
  • Perfect for intensive prep

Frequently Asked Questions

Everything you need to know about the platform.

How realistic are the AI interviews?

Our AI is trained on real system design interviews. It follows the same phase structure, asks follow-up questions, and applies time pressure just like a real interviewer. Many users report that it feels more realistic than expensive mock interview services.