Code Room
System designMedium
Question
Design an online learning platform that hosts course videos, tracks each student's progress, and runs quizzes/assessments at scale.
What a strong answer looks like
Clarify scale and constraints first. Propose a clean component breakdown, then go deep on the hard parts — data model, bottlenecks, consistency, failure modes — and name the trade-offs you are making.
Learn the concepts
Loading whiteboard…
Run or narrate your approach, then ask the coach.