Westpac Group Data Scientist Interview Questions
The questions to prepare for a Westpac Group Data Scientist interview. Questions from real interview reports rank first. Updated daily.
Calculate each user's rolling 30-day average transaction volume using PostgreSQL window functions.
Demonstrate how INNER JOIN and LEFT JOIN differ when matching customers to account records.
Explain how to diagnose and optimize a slow analytical query on a multi-terabyte event table using SQL-aware tuning strategies.
Approach a mixed interview round while summarizing completed activity with a CTE, aggregation, and left join.
WiseBuild a systematic process to validate, decompose, and explain a sudden 10% drop in core engagement.
Assess why checking experiment results early can inflate false positives and distort ship decisions.
Framework for deciding when to favor short-term conversion gains versus long-term retention in a product decision.
Identify major online experimentation pitfalls and explain practical mitigations for SRM, network effects, peeking, and novelty.
Define a success metric for a new feature that captures real user value, not just raw usage.
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