AI Engineer (Mid-Level) at Clera

4 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. What does `git rebase` do differently from `git merge`?

It rewrites commit history onto a new base instead of creating a merge commit It deletes the branch being rebased It is identical to merge It only works on the main branch

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

EC2 S3 IAM Route 53

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

pandas flask requests pytest

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