o9 Solutions Data Engineer Interview Questions

The questions to prepare for a o9 Solutions Data Engineer interview. Questions from real interview reports rank first. Updated daily.

3questions

~1htotal time

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PipelinesStart here. 1 question · ~8 min

Explain an ETL process you developed, including architecture, transformations, orchestration, data quality, and operational recovery.

Technical Fundamentals1 question · ~8 min

Tests practical PySpark optimization across execution plans, shuffles, partitions, joins, caching, and memory.

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SQL & Data Manipulation1 question + 3 drills · ~38 min

Explain SQL Join TypesEasy

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Explain INNER, LEFT, RIGHT, FULL OUTER, CROSS, and SELF JOINs with examples and when to use each.

JoinsData WranglingGroup Byoo9 Solutions

Aggregate January transaction totals and rank categories using a window-function rewrite.

Optimize a slow PostgreSQL query on a large dataset by choosing better filters, joins, and indexes.

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

The finish line: interview-readyComplete all 3 questions plus 3 hands-on drills to finish this plan.