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The Change Tracker

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
junior, mid, senior

Interview Prompt

Our data warehouse tracks slowly changing dimensions. Write a function called detect_changes that takes two lists of dictionaries (old records and new records). Each dictionary has an 'id' key. Return a dictionary with three keys: 'added' (ids in new but not old), 'removed' (ids in old but not new), and 'modified' (ids in both where any other field differs). Each value should be a sorted list of ids.

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