Comebck is an AI-powered platform where you practice system design interviews by architecting real systems. An AI assistant writes code, an AI judge evaluates your decisions, and a live visualizer renders your architecture.
A complete IDE experience with AI assistance, live visualization, and automated evaluation — all in your browser.
An integrated Gemini-powered assistant that writes code on your behalf. You direct the architecture; the AI handles implementation.
Automated evaluation engine that scores your system design decisions across 7 criteria: scalability, reliability, caching, consistency, security, code quality, and AI utilization.
Real-time graph rendering of your system design. See API endpoints, databases, caches, and queues as interactive nodes that update as you code.
Compile and test your Python implementations in the browser. Run against predefined test suites that verify HTTP endpoints, input validation, and security.
Problems modeled after actual systems at Google, Apple, and Microsoft. Not abstract textbook exercises.
Apple
Microsoft
Start free. Upgrade when you're ready.
$0
$29/month