Mercari Frontend Engineer Interview Questions

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

38questions

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System DesignStart here. 6 questions · ~48 min

Tests ability to build correct SPA navigation, routing, and API integration for Mercari-like item flows.

Preventing Frontend VulnerabilitiesHard

Assesses knowledge of frontend security practices and threat mitigation.

xssSecurity

Mercari

Caching for Offline CapabilityMedium

Assesses system design for offline-first behavior using caching.

performance

Mercari

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Coding15 questions · ~121 min

Tests debugging skills for performance issues and memory leaks in frontend code.

Refactor for Efficiency and MaintainabilityHard

Assesses refactoring skills focused on performance and code maintainability.

refactoringmaintainabilityefficiency

Mercari

Build API-Driven Mini AppMedium

Tests ability to build UI that consumes APIs and implements filtering logic.

api

Mercari

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Behavioral & Leadership16 questions · ~129 min

Balancing Speed and MaintainabilityEasy

Tests how you prioritize short-term delivery against long-term code health, and whether you lead with clear trade-offs and ownership.

LeadershipOwnershipPrioritization

Mercari

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