Staff Platform Engineer, AI & Agentic AI Platform Engineering at Pfizer

3 questions, about 3 minutes. This is a diagnostic, not a certification — it estimates your skill readiness, it does not guarantee you are qualified for or will be hired into this role.

1. What does `df.groupby('region')['sales'].sum()` return?

The total sales across the whole dataframe Total sales summed for each distinct region A count of rows per region An error, because groupby requires two columns

2. Which AWS service is primarily used for scalable object storage?

EC2 S3 IAM Route 53

3. Which library is most commonly used for tabular data manipulation in Python?

pandas flask requests pytest

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