Sketch architecture on a whiteboard, narrate trade-offs with an AI interviewer, and get a rubric-based report on scope, scaling, and communication.
Design Systems Like You're Already in the Loop
Pick a classic problem, draw on an infinite canvas, and talk through requirements, components, and scaling—AI listens, probes, and scores how you think out loud.
Trusted by candidates at top companies
How It Works
Pick a problem → sketch → discuss → evaluate → improve
Pick a problem
URL shortener, chat, feed, or payment flow—start from a curated prompt
Whiteboard your design
Draw components, data flows, and APIs on an Excalidraw canvas
Voice with AI interviewer
Clarify requirements, justify trade-offs, and go deep on bottlenecks
Rubric report
Scores for scope, architecture, scaling, and communication—with next steps
See It In Action
From blank canvas to architecture diagram—practice the full system design loop interviewers expect.
Built for real system design interviews
Go beyond memorizing diagrams—practice clarifying, sketching, and defending your design.
Interactive whiteboard
Excalidraw-powered canvas with shapes, arrows, and labels that save with your session
AI voice interviewer
Live prompts on capacity, failure modes, and consistency—like a senior panelist
Architecture focus
Practice component diagrams, data stores, queues, caches, and load balancers
Dimension scoring
Weighted rubric: scope, architecture, scaling deep dive, and communication
Session recording
Replay your session to review pacing, clarity, and diagram evolution
Coding round combo
Round out tech prep with coding practice and AI screening sessions
Explore coding practice
Ready for your next system design loop?
Walk into the room knowing you've already whiteboarded, narrated, and scored a full session.