Using BoardSnap for system design interview prep.

System design interviews are hard to practice well. The best simulation is a physical whiteboard session — same conditions as an onsite loop — but the output of each session disappears when the board gets erased.

BoardSnap closes that loop.

The practice workflow

1. Set a timer and sketch a system design on a physical whiteboard — URL shortener, ride-sharing backend, messaging system, whatever the practice prompt is.
2. When time is up, snap the board with BoardSnap. VisionKit corrects the perspective. BoardSnap AI reads the components, arrows, labels, and margin notes.
3. Read the summary. Does it describe a coherent system? Are the major components captured? What's missing?
4. Open the project AI chat. Ask: "What are the bottlenecks in this design?" or "What would break at 10x scale?" or "What caching strategy am I missing?"
5. Snap the revised design after the debrief. Build a library of your practice designs inside a dedicated "System Design Prep" project.

Why this beats just reviewing a photo

A photo of your whiteboard is inert. The BoardSnap summary is a readable description of the architecture that you can think critically about. The AI chat lets you stress-test the design interactively — like a gentle interviewer who read your diagram.

Projects for different problem types

Create a project per problem category: "Storage Systems," "Real-Time Systems," "Search & Ranking." Each practice session within that category builds context that the AI remembers, so later sessions in the same project benefit from earlier designs being pinned as reference.

During the real interview

BoardSnap is not a tool you use during the interview itself — you're at the whiteboard, not your phone. But the habit of snapping and reviewing practice sessions sharpens the actual design thinking that matters in the room.