Page view counter
Design a simple analytics counter that tracks page views for a small content site (a few thousand articles). For each article you want a total view count and a daily count, shown to the author on a dashboard. Writes happen on every page load; the dashboard is read occasionally. Describe how you record views and serve the counts without slowing down page loads.
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.
Clarify3:00 left
Estimate3:00 planned
Design8:30 planned
Deep dive6:30 planned
Failure4:00 planned
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.
Run or narrate your approach, then ask the coach.