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Updated weekly · Last refresh Aug 30

eBay Backend Engineer Interview Questions

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

12questions
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1
CodingStart here. 4 questions · ~38 min
Graph Pathfinding or TraversalMedium
Practice

Use Dijkstra's algorithm to find the fastest route through eBay fulfillment locations.

traversalGraphseBay
Design Discount Checkout CartMedium

Assesses system and data modeling choices for implementing discount logic in a checkout flow.

eBay
Optimize Array Task ComplexityMedium

Evaluates ability to analyze and improve algorithmic complexity for array problems.

time complexityArraysoptimizationeBay
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2
System Design4 questions · ~38 min
Distributed Cache for Trading DataHard

Assesses system design skills for caching at scale, including consistency, latency, and failure handling.

distributed systemscachingeBay
Refactor Legacy Business ManagerMedium

Assesses code quality improvements, refactoring strategy, and robust error handling in production systems.

refactoringerror handlingdesign patternseBay
AI-Driven Watchlist GroupingHard

Evaluates end-to-end system design for AI-assisted personalization and watchlist management.

AIeBay
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3
More topics4 questions · ~38 min
AI-Driven Watchlist GroupingHard

Assesses your ability to design AI-driven pipelines and incremental updates for user-facing experiences at eBay.

AIeBay
SQL vs NoSQL TradeoffsMedium

Evaluates your understanding of data modeling and when to choose SQL versus NoSQL systems.

nosqlcomparisonsqleBay
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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 12 questions plus 3 hands-on drills to finish this plan.