Voleon Group Data Scientist Data Manipulation (SQL/Python) Interview Questions
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Voleon Group
Medium
Data ScientistAnalyze time-zoned events with pandas
You are given two pandas DataFrames. events columns: user_id:int, ts:str ISO-8601 with timezone (e.g., '2025-08-31T23:58:43-07:00'), event:str in {'si...
Data Manipulation (SQL/Python)
0
0
Oct 13, 2025
Voleon Group
Medium
Data ScientistLoad and visualize large CSV robustly
You're screen-sharing in a HackerRank environment with Python 3, pandas, numpy, seaborn, and matplotlib available. You are given a single file data.cs...
Data Manipulation (SQL/Python)
0
0
Oct 13, 2025
Voleon Group
Medium
Data ScientistPre-process Financial Data for Linear Regression Modeling
market_data +------------+----------+----------+--------+ | date | feature1 | feature2 | target | +------------+----------+----------+--------+ ...
Data Manipulation (SQL/Python)
0
0
Aug 4, 2025