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Mercari Software Engineer Interview Questions

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

50questions
~7htotal time
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1
ExecutionStart here. 8 questions · ~64 min
Migrate Monolith to MicroservicesHard

Plan a zero-downtime migration from a legacy monolith to microservices while managing risk, sequencing, and stakeholder pressure.

Trade-offsRoadmappingRisk AssessmentMercari
Balancing Speed Quality and ScopeHard

Describe a time you had to choose between speed, quality, and scope, and how you aligned stakeholders around the trade-off.

Trade-offsRisk AssessmentScope ManagementMercari
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2
Coding20 questions · ~160 min
Goroutines vs Threads and RacesMedium

Tests Go concurrency fundamentals and practical race-condition prevention techniques.

RecursionHash TablesQueueMercari
Memory-Constrained Shortest PathHard

Tests graph algorithm selection and memory-efficient implementation details.

QueueGraphsMercari
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3
System Design11 questions · ~88 min
Scalable Push Notification SystemHard

Tests system design for high-throughput, reliable push notifications at marketplace scale.

notification systemscalabilityMercari
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4
Behavioral & Leadership6 questions · ~48 min
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5
More topics5 questions · ~40 min
Push Notification Service at ScaleHard

Tests large-scale event processing, delivery reliability, and throughput-oriented system design.

InfrastructureStream ProcessingOrchestrationMercari
Primary Key ChoicesMedium

Evaluates your reasoning about data modeling, uniqueness, and access patterns.

databaseMercari
Benefits of PHP 7Easy

Evaluates your knowledge of language/runtime improvements and practical impacts.

Mercari
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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
Sum From 1 to 1,000,000Easy
Practice
Practice drill

Calculate the sum of integers from 1 to 1,000,000 using PostgreSQL aggregation and filtering.

AlgorithmsVirtu Financial
Pivot Lucid Campaign Performance by MonthMedium
Practice
Practice drill

Use joins, a CTE, CASE expressions, and monthly pivoting to compare Lucid campaign performance across channels.

pivot tablesnull handlingData WranglingLucid Motors
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.