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Updated weekly · Last refresh Aug 30

eBay Data Engineer Interview Questions

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

11questions
~1htotal time
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1
PipelinesStart here. 5 questions · ~40 min
Flash Sale Inventory ConflictsHard

Tests your conflict-resolution strategy for inventory correctness under extreme demand and concurrency.

Conflict Resolutioninventory managementdistributed systemseBay
Ticketing System with Read DelayHard

Tests your distributed systems design for consistency, latency, and correctness in eBay-style workloads.

system designscalabilityeBay
Fixing Inventory LatencyHard

Tests your ability to reduce user-visible inconsistency by improving data freshness and transactional behavior.

latencyuser experienceeBay
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2
Coding4 questions · ~32 min
BFS for Service ReachabilityMedium

Tests your ability to apply graph algorithms to trace dependencies across eBay services.

bfsAlgorithmseBay
Service Graph from LogsMedium

Tests your skill at transforming logs into graph representations to reason about service dependencies.

Data StructuresGraphseBay
Debugging and Unit TestingMedium

Tests your ability to debug effectively and build reliable unit tests for eBay data systems.

DebuggingeBay
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3
More topics2 questions · ~16 min
Indexing for High-Read WorkloadsMedium

Tests your understanding of indexing trade-offs and how they impact query latency and throughput at scale.

performanceeBay
Project Walkthrough and ImpactMedium

Assesses leadership, problem-solving, and ability to communicate technical impact.

project experienceProblem SolvingeBay

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Second Highest Trader SalaryEasy
Practice
Recently asked
Practice drill

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingeClinicalWorksInformaticaSpectraforce Technologies
Compare Weekly User Activity TrendsMedium
Practice
Recently asked
Practice drill

Aggregate user activity by week, then use LAG to compare sessions and watch time versus the prior active week.

Window FunctionsLag/LeadDate FunctionsB Lab GlobalTapadScale
Compare Monthly User Retention CohortsMedium
Practice
Practice drill

Calculate month-1 retention for January vs February signup cohorts using joins, date filtering, and aggregation.

Window FunctionsDate FunctionsAggregationsTrideumZulilyeBay
The finish line: interview-readyComplete all 11 questions plus 3 hands-on drills to finish this plan.