• 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

See here for more information about our mission and values.

Work Responsibilities

• Lead the development of complex backend features and services, such as payment processing and inventory management systems
• Design and implement scalable backend architectures and patterns, including microservices and event-driven systems
• Drive technical decisions and best practices for backend development, including coding standards, performance budgets, and testing strategies
• Mentor and guide other engineers in backend development practices through code reviews and technical presentations
• Collaborate with product and frontend teams to define technical requirements and feasibility of new features
• Optimize backend performance and scalability, focusing on database optimization, caching strategies, and load balancing
• Contribute to backend platform technology and strategic roadmap decisions, including technology evaluation and technical debt reduction
• Lead technical discussions and architectural reviews for major features and system changes

Unique Challenges

• Be a part of a small distributed team with oversight over Mercari US's entire backend system, delivering value to millions of daily active customers across the US.
• Work in a globally distributed team, collaborating with teammates in both Tokyo and the US, to deliver impactful solutions across time zones and cultures.
• Be the voice of Mercari US for our group-wide shared platform components.

Qualifications

• Required Experience/Skills

• Deep understanding of backend performance optimization techniques

• Strong architectural and system design skills

• Excellent mentoring and technical leadership abilities

• Preferred Experience/Skills

• Expert knowledge of Go and PHP ecosystems

• MySQL
• Spanner
• Google Cloud Platform
• Kubernetes

• Excellent knowledge of Agentic AI tools and workflows

• 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:
• Mercan:
• 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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