Your question is Large Dataset Aggregation in Python. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me about a time you used Python to process a large dataset of records, group them by a key, compute per-group aggregates, and filter results based on a company-wide threshold while keeping the solution efficient.