Product Engineer, Backend(Shops) - Mercari

JD in Japanese follows. 英文の後に和文JDをご覧いただけます。 Product Engineer, Backend(Shops) - Mercari 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 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