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Updated weekly · Last refresh Oct 17

Impact Data Engineer Interview Questions

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

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1
SQL & Data ManipulationStart here. 3 questions + 2 drills · ~59 min
SQL Query for Author CountsEasy
Practice

Use JOIN, GROUP BY, and HAVING to find Impact authors with at least five published books.

Data Analysissql queriesImpact
SQL Percent of Same-Day SalesMedium

Assesses your ability to write SQL with date logic, aggregation, and percentage calculations.

Data Analysissql queriesImpact
Modeling a Star SchemaMedium

Tests your ability to model analytics-ready schemas using facts and dimensions.

star schemaData ModelingImpact
SQL Conversion Rate with Rolling AverageMedium
Practice
Practice drill

Calculate monthly channel conversion rates and rolling three-month averages with PostgreSQL aggregations and window functions.

Window FunctionsLag/LeadDate FunctionsImpactDENSO
SQL Top 3 Per CountryMedium
Practice
Practice drill

Rank users by total revenue within each country and return the top three ranked users per country.

Window FunctionsData ManipulationRankingImpact
2
More topics3 questions · ~39 min
BST Binary Search CodingEasy

Tests your ability to implement common BST operations and reason about time complexity.

leetcodeImpact
Recursive Integer SumMedium
Practice

Recursively sum a validated integer collection while preventing invalid-input and recursion-depth runtime errors.

RecursionjavaArraysImpact
Impact Motivation and SQL PipelinesMedium

Evaluates motivation and your practical fit for building data pipelines and working with SQL at Impact.

interestdata pipelinessqlImpact

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