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Updated weekly · Last refresh Nov 13

C3 AI Data Engineer Interview Questions

The questions to prepare for a C3 AI Data Engineer interview. Questions from real interview reports rank first. Updated daily.

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1
PipelinesStart here. 13 questions · ~122 min
Data Integration Problems in Reporting PipelinesEasy

Common pipeline issues when combining multiple data sources, including schema mismatch, data quality, orchestration, and duplicate handling.

ETLData ModelingQualityC3 AI
Privacy Compliance in Data PipelinesMedium

Approach for building privacy controls, lineage, and auditability into data pipelines that handle personal data.

Compliancedata privacyPipelinesC3 AI
Structured vs Unstructured DataEasy

Explain how structured and unstructured data differ, and why that matters for pipeline design and downstream processing.

ETLData ModelingQualityC3 AI
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2
Coding3 questions · ~28 min
Merge Two Sorted Linked ListsEasy

Tests core coding ability and correctness for a standard algorithmic problem.

RecursionLinked ListsSortingC3 AI
Handle Missing Values in PythonEasy

Tests practical data cleaning skills and appropriate imputation strategies.

MathArraysData WranglingC3 AI
CSV to Database Python ScriptMedium

Tests ability to implement ingestion logic and interact with databases using Python.

Hash TablesArraysStringsC3 AI
3
More topics4 questions · ~38 min
Second Highest Without AggregatesHard
Practice

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsC3 AI
Second Highest Salary at NovaTechEasy
Practice

Find the second highest distinct employee salary from a single table, returning NULL if it does not exist.

SubqueriesRankingAggregationsC3 AI
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Hands-on SQL practiceWrite and run real queries in the editor. 1 drill · ~10 min
Top Channels by Conversion RateMedium
Practice
Practice drill

Rank Rocket App marketing channels monthly using joins, distinct conversion counts, CTEs, and ROW_NUMBER.

Window FunctionsRankingAggregationsRocketSpring HealthCCapital on Tap
The finish line: interview-readyComplete all 20 questions plus 1 hands-on drill to finish this plan.