Product Engineer, Backend(Shops) - Mercari

本ポジションは日本語JDの用意がありません。

Product Engineer, Backend(Shops) - Mercari

• Employment Status:　Full-time / Contract / Intern / Part-time
• Work Hours: Full Flextime (no core time) / Eight hours + one-hour break per day

/ Shift　

• Office: Roppongi, Osaka, Fukuoka

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

In the Shops team, we're building Mercari's B2C marketplace. Mercari began as a marketplace between people; we extend that to businesses selling directly to customers, including higher-value categories that need more trust and quality assurance than person-to-person selling can easily offer. Giving customers confidence in what they buy, and giving businesses the tools to sell it well, is our work.

We run two products at different stages. Mercari Shops is live today, used by businesses and their customers. M Department is a newer B2C service still taking shape. Both are built on a shared foundation, and that's where this role sits.
We're a mix of backgrounds and first languages. We'd rather surface a disagreement early than find it in production.

See here for more information about our mission and values.

Work Responsibilities

• Build and ship backend features in Go across product details, catalog, checkout, and order and seller management.
• Own a feature area end to end: work the design out with the team and see it through to a decision. Early on you will do this with support; the more you grow, the more you lead.
• Design APIs and data models, and keep their contracts clear for the frontend, mobile, and partner teams that depend on them.
• Write readable, well-tested code and play an active part in code reviews. More experienced engineers will review your work and help you grow.
• Help operate what you build: join the on-call rotation (with support while you get up to speed) and see incidents through to a fix.
• Keep documentation and runbooks current as the systems change.
  
  

Unique Challenges

• Shops and M Department share the same backend services, so every feature, schema migration, and API change has to work for both without breaking the one already serving customers. It's brownfield, which is harder than greenfield: backward compatibility, cross-tenant data isolation, and phased deployment aren't negotiable.
• We look for engineers who focus on solving problems rather than staying within a single role. Your main work will be backend, but you'll regularly work across frontend, mobile, and infrastructure as needed. We believe in growing engineers who can think and contribute beyond a single technology stack, and you'll leave with a broader skill set than you arrived with.
• AI tools are part of how we work every day, from writing code to reviewing PRs. We're looking for people who are eager to shape how we use them and push what they can do.
• Mistakes cost sellers money, so we rely on tests, staged rollouts, and code review to move fast.
  
  

Qualifications

• Required Experience/Skills
• A solid software engineering foundation. You can build and ship working backend code, whether from a job, internships, or substantial personal or academic projects.
• Comfortable in at least one programming language, and happy to work mainly in Go. Prior Go experience isn't required if you're willing to learn it.
• Familiarity with API design (gRPC or REST) and relational databases such as Postgres.
• Testing, code review, and version control are a normal part of how you work.
• Able to work in a team and put your thinking clearly in writing.
• Curious about AI tools and open to using them every day.

If you're excited about this role but don't meet every qualification, we still encourage you to apply.

• Preferred Experience/Skills
• Professional experience building and running backend services in production.
• Production experience with Go.
• Operating services on a cloud platform (we use GCP and Kubernetes), including on-call and monitoring.
• Some experience contributing to system or API design decisions.
• Familiarity with e-commerce or marketplaces, though experience with backend in another domain might work just as well.
• Comfortable working on early-stage products where the requirements and foundations are still taking shape.

• Language
• Japanese: B2
• English: B1
• or
• Japanese: B1
• English: B2
• (1 of the language should be B2 and the other B1)

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.

Please read and acknowledge our Privacy Policy prior to submitting your application.