QA Engineer - US App

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 section on our Careers site.

About Mercari

Circulate all forms of value to unleash the potential in all people

"What can I do to help society thrive with the finite resources we have?" The Mercari marketplace app was born in 2013 out of this thought by our founder Shintaro Yamada as he traveled the world. We believe that by circulating all forms of value, not just physical things and money, we can create opportunities for anyone to realize their dreams and contribute to society and the people around them. Mercari aims to use technology to connect people all over the world and create a world where anyone can unleash their potential. For more information about Mercari Group’s mission, see Mercari’s Culture Doc

Organization/Team Mission

Mercari Engineering Principles

Mercari Engineering Principles are a shared understanding that serves as the foundation of engineering beliefs and behavior at Mercari. The Engineering Principles are designed to complement the organizational identity (Mercari’s mission, values, and culture) from an engineering viewpoint.

These principles ultimately help us achieve Mercari’s mission by defining the ideal state we seek to realize in the long term.

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

For more details, please see the following link:

• Engineering Culture

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 on Mercari. 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.

See here for more information about our mission and values.

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 by user stories and product specs are comprehensive, with clear acceptance criteria and accurate estimates, in collaboration with the Product and Engineering teams.
• Engage in all SDLC phases, from requirements definition to 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.
• Be able to triage automated testing runs on GitHub Actions and understand why mobile automation might have failed or was flaky.
• Efficiently report issues with clear reproducibility and escalate urgent concerns, alongside analyzing and reporting on quality metrics to maintain project standards.
• Rethink and evolve QA practices for an AI-accelerated development environment — taking a holistic view of the entire development flow, from spec review and code review through automated verification and final release gates, and driving the team toward AI-native quality engineering rather than applying traditional manual-testing-centric workflows.

Unique Challenges

• Collaborate with a dynamic Tokyo-based team and engage with colleagues across the US to drive Mercari’s mission of facilitating buying and selling, preparing for future challenges in a global context.
• Actively contribute innovative ideas to enhance our engineering community.
• Develop a comprehensive knowledge of the US market to secure Mercari’s growth and relevance.
• Acquire new domain expertise, skills, and technologies that are valuable and applicable to our evolving needs.
• Help define what great QA looks like in the AI era — where development velocity has fundamentally changed and quality engineering must evolve accordingly.

Qualifications

• Required Experience/Skills
• 5+ years of experience in QA methodologies and software testing techniques, with a strong foundation in Android or iOS testing and familiarity with respective platform UI standards, and a demonstrated track record of transitioning from manual to AI-driven testing approaches.
• Demonstrated hands-on experience as an AI-native practitioner — actively using AI tools throughout your own development and testing workflow, with a concrete understanding of how to ensure quality at every stage of the development flow without relying on manual testing as the primary approach.
• Demonstrated experience with any object-oriented programming languages (Java, Python, Objective C, etc…), or automation frameworks like Cypress/Detox and experience with testing and using REST APIs.
• Experience with Git and development and testing tools such as JIRA, TestRail, Claude Code, and Cursor.
• Demonstrated experience in 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 working in a customer-facing app or e-commerce business with a large-scale user base

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

For details about CEFR, see here.

Learn More About Mercari Group

• Careers site: https://careers.mercari.com/en/
• Mercan: https://mercan.mercari.com/en/
• Social media: X / Linkedin

Recruiting at Mercari

At Mercari Group, we value empathizing with and embodying the mission and values ​​of the Group and each company. To promote the creation of an organization that maximizes the total amount of value exhibited by all members, we would like to understand the experience and skills of each candidate as accurately as possible.

Recruiting cycle at Mercari Group

• Application screening
• Skill assessment: For engineering positions, you will be asked to complete a skill assessment on HackerRank or GitHub. For non-engineering positions, you may be asked to complete an assessment depending on the position. (The timing of the assessment may coincide with the interview process.)
• Interview: The number of interviews may vary depending on the position.
• Reference check: We will ask for online references around the timing of the final interview.
• Offer: Offers will be determined carefully in consideration of the final interview and the reference check.

　Learn more about our recruiting process here.

Equal Opportunity Hiring

Here at Mercari, we work to realize a world in which no one’s potential is limited by their background and everyone has the opportunity to freely create value. We also firmly believe that a mindset of Inclusion & Diversity is essential for us to achieve our mission.

This, of course, extends to our hiring practices as well. Mercari is committed to eliminating discrimination based on age, gender, sexual orientation, race, religion, physical disability, and other such factors so that anyone who shares our mission and values can join us, regardless of their background. For more details, please read our I&D statement.

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