Sum of Their Parts
A medium 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
- medium
- Seniority
- L4
Interview Prompt
A product analytics feed gives us events, each with a `user_id`, an `event_type` and an `amount`. Produce one flat record per user holding the `user_id` and a key per event type with that type's total `amount`, keeping only each user's three biggest types.
Summary
A stream of raw actions, folded into one portrait per person.
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