N

Notion

Medium
7Challenges
2War Rooms
~28hPrep Time
1/7Completed

Product-minded engineers building extensible systems. Balance matters.

14% complete
Interview rounds:Phone ScreenCoding ×2System DesignBehavioral

PR Review2

Missing useEffect Cleanup — Memory Leak on UnmountA junior dev added a live-poll feature to the notifications panel. After navigating away, …
Junior~10 min
CSS Z-Index Stacking ContextA PR added a subtle fade-in animation to the main application wrapper. Suddenly, all confi…
Mid~8 min

System Design1

Design Google Docs (Real-Time Collaboration)Design a real-time collaborative document editor like Google Docs. Multiple users can edit…
Senior~60 min

Tech Debt Tribunal2

Fix Mutable Shared StateHttpClient mutates the global config timeout to 50ms. AnalyticsClient reads the same objec…
Mid~25 min
Missing Pagination on a List EndpointA GET /notes endpoint returns all rows with no LIMIT. At 2M rows it times out. Add cursor-…
Mid~25 min

War RoomNotion-specific2

Block Database Consistency FailureNotion's block tree database got into an inconsistent state after a concurrent edit from w…
P1+1000 XP
Export Queue BacklogThe PDF/Markdown export queue has a 6-hour backlog. Users see export pending with no statu…
P2+750 XP