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The Narrow Lens

A medium Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.

Domain
Python
Difficulty
medium
Seniority
senior

Interview Prompt

Our real-time metrics dashboard smooths noisy signal data using a sliding window. Build a class that maintains the last N values added and returns the current window average each time a new value arrives. If fewer than N values have been added, average what's present.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your python solution with real code execution
  4. Get instant feedback and a hire/no-hire decision