The Fallback Layer
An easy Python mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- Domain
- Python
- Difficulty
- easy
- Seniority
- L3
Interview Prompt
A service builds its runtime config by layering the environment values in `primary` over the baseline in `defaults`. Produce that config, with any `None` from the environment filled in from the baseline.
Summary
When the live values come back empty, something has to stand in.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write and run your Python against test cases
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision