本ポジションは日本語JDの用意がありません。

QA Engineer - US App

• Employment Status: Full-time
• Work Hours: Full Flextime (no core time)
• Office: Roppongi

For more details, see the Overview of Our Positions.

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Organization/Team Mission

Engineering Principles:

• Passion For The Product
• Grow Together
• Solve Through Mechanisms
• Collaborate Openly

Learn more: Engineering Culture

QA Mission:
Within QA, our mission is to ensure the best quality software is shipped to our users and to provide world-class user experience when buying or selling. Quality is at the heart of everything we do and we want you to come on this journey with us in building the best C2C marketplace possible.

Learn more about our mission and values here.

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Work Responsibilities

• Serve as a subject matter expert, deeply understanding one or more specific product areas such as Search, Payments, Shipping, or Operational tools, and mentor others in QA best practices.
• Take a leadership role in the feature definition process by ensuring product specs are comprehensive and have clear acceptance criteria, collaborating with Product and Engineering teams.
• Engage in all SDLC phases, including requirements definition, coding, and maintaining automated tests, while identifying specification gaps and working within a cross-geo team.
• Develop and execute detailed test plans and test cases from user stories and technical documents, manage and maintain mobile automation tests (e.g., Detox, Maestro), and perform manual and exploratory testing as needed.
• Triage automated testing runs on GitHub Actions and analyze failures.
• Efficiently report issues and escalate urgent concerns, analyze report quality metrics to maintain project standards.
• Rethink and evolve QA practices for an AI-accelerated development environment, driving the team toward AI-native quality engineering.

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Unique Challenges

• Collaborate with a dynamic Tokyo-based team and engage with colleagues across the US.
• Actively contribute innovative ideas to enhance our engineering community.
• Develop comprehensive knowledge of the US market.
• Acquire new domain expertise and technologies for evolving needs.
• Help define what great QA looks like in the AI era.

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Qualifications

Required Experience/Skills

• 5+ years in QA methodologies and software testing, with strong Android or iOS testing foundation, and proven transition from manual to AI-driven testing approaches.
• Hands-on experience as an AI-native practitioner—actively using AI tools throughout development and testing workflow, with a concrete understanding of quality assurance without heavy reliance on manual testing.
• Experience with any object-oriented programming languages (e.g., Java, Python, Objective C), or automation frameworks like Cypress/Detox, and experience with REST APIs.
• Experience with Git, JIRA, TestRail, Claude Code, and Cursor.
• Demonstrated experience leading QA efforts across projects or teams, including test planning, coverage strategy, and cross-functional collaboration.
• Ability to document and troubleshoot issues and a passion for improving user experience.

Preferred Experience/Skills

• Experience working in remotely distributed teams in different timezones.
• Experience in customer-facing apps or e-commerce with a large-scale user base.

Language Requirements

• English: Business level (CEFR B2 or higher) required
• Japanese: Basic (CEFR A2) optional

For CEFR details, see here.

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Learn More

• Careers site
• Mercan
• Social: X / Linkedin

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Recruiting Process

• Application screening
• Skill assessment (HackerRank/GitHub, or equivalent)
• Interviews (number may vary)
• Reference check
• Offer (pending final interview and reference check)

Details: Recruiting Process

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Equal Opportunity Hiring

We are committed to Inclusion & Diversity and aim to provide equal opportunities regardless of background.
Read our I&D statement.

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