The Record Reconciler
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
- L4
Interview Prompt
Two nightly imports of the same ledger should hold identical records keyed by `id_field`, but the upstream systems drift and rows diverge. Reconcile the two lists into four id-ordered buckets: ids only in `source_a`, ids only in `source_b`, ids in both with identical records, and ids in both whose records differ, reporting for that last bucket which non-id fields differ and each source's value.
Summary
Two versions of the same truth.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your python solution with real code execution
- Get instant feedback and a hire/no-hire decision