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Updated weekly · Last refresh Aug 30

AppsFlyer Data Engineer Interview Questions

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

50questions
~7htotal time
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1
SQL & Data ManipulationStart here. 3 questions + 2 drills · ~45 min
Top N Records in SQLEasy
Practice

Return the top 3 open TEKsystems requisitions by priority using WHERE, ORDER BY, and LIMIT.

Window FunctionsRankingAggregationsAppsFlyer
Optimize Dimensional Join PerformanceMedium

Evaluates your SQL performance diagnosis and optimization skills for analytics joins.

optimizationAppsFlyer
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

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

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
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2
Pipelines34 questions · ~282 min
Star vs Snowflake SchemaEasy

Compare star and snowflake schemas in a warehouse pipeline, including structure and transformation trade-offs.

snowflake schemastar schemaData ModelingAppsFlyer
Reconciling Data Across SourcesMedium

Explain a practical process for reconciling records from multiple sources before financial analysis.

ETLData ModelingQualityAppsFlyer
Data Quality and Schema EvolutionMedium

Approach for handling schema changes and data quality checks in a high-volume data lake pipeline.

schema evolutionData ModelingQualityAppsFlyer
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3
Coding3 questions · ~25 min
Explain OOM From DataFrame CollectHard

Assesses your understanding of distributed execution, memory pressure, and safer logging patterns.

DebuggingAppsFlyer
Sorting Algorithm Time ComplexityMedium

Tests understanding of algorithmic complexity and performance implications.

MathArraysSortingAppsFlyer
Data Structure Trade-OffsMedium

Tests your ability to select appropriate data structures based on time, space, and access patterns.

Hash TablesLinked ListsTreesAppsFlyer
4
Behavioral & Leadership10 questions · ~83 min
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The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.