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Frontend System DesignMedium~30 minPro

Building an Infinite Scroll Feed at Scale

What to Expect

System Design Discussion

The interviewer asks architecture questions and probes your decisions with follow-ups.5 signals evaluated

Coding Follow-up

Implement a solution based on your discussion. Full editor with test cases. ~5 min

Interview Feedback

Numeric score, signal breakdown, staff engineer perspective, and strong candidate comparison.

Signals Tested

  • Choose between offset and cursor-based pagination
  • Implement scroll-triggered data fetching with IntersectionObserver
  • Handle duplicate posts across page boundaries
  • Design for memory constraints with large feeds

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