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The Deep Config

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 deployment system stores configuration as deeply nested dictionaries, but our feature flag service needs flat key-value pairs. Write a function called flatten_config that collapses nested dicts into dot-separated keys - e.g., {'a': {'b': {'c': 3}}} becomes {'a.b.c': 3}.

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