Master System Design
Like a Real Interview.
The first simulator that grades your architecture in real-time. Build systems, face chaos events, and get AI feedback — all before the actual interview.
See it in action
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Canvas
AI Interviewer
Evaluation
Chaos Mode
Analytics
Everything you need
Core Features
A complete system design interview simulator — from canvas to chaos to evaluation.
Interactive Design Canvas
Drag-and-drop Load Balancers, App Servers, SQL Databases, Redis Caches, Message Queues, and CDNs. Wire them together and build real architectures — not just diagrams.
AI Interviewer
Gemini-powered interviewer checks in every 5 minutes with probing questions and nudges.
Chaos Mode
Mid-interview node failures and traffic spikes. Fix it in 5 minutes or lose marks.
Structural Linter
Real-time detection of disconnected nodes, missing caches, and single points of failure.
Deep Evaluation
Score 0–100 with AI-generated strengths, weaknesses, and suggestions. Structural rules + Gemini reasoning combined into one final grade.
Load Simulation
Run traffic simulations to see which nodes bottleneck under 100k RPS.
Progress Analytics
Score trends, structural rule heatmaps, and weakness frequency across all sessions.