Software Engineer - Internship

March 6

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Mercari, Inc.

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Mercari Group is a Japan-based corporate group operating in both Japan and the US under a mission of “create value in a global marketplace where anyone can buy & sell.” Mercari Group operates several businesses. The first is Mercari, Japan’s largest marketplace app allowing anyone to enjoy easily buying and selling items from their smartphone. Additionally, the Group offers Merpay, a simple, entirely in-app payment service, and Mercari Shops (Souzoh), an e-commerce platform for small businesses. Most recently, the Group established Merlogi as well, as a new company to bring greater innovation to the logistics industry going forward.

Mercari • Mobile • Smartphone • C2C • Flea Market

1001 - 5000 employees

📋 Description

• Employment Status:Intern - Please apply only if you are able to stay in Japan, as the internship must be from within Japan. For those who live overseas, we will provide Visa support and accommodation arrangements. • Work Hours: Able to work more than 20 hours per week 3 months of Internship is encouraged. Please consult with the recruiter if you prefer shorter/longer period • Office: Remote or 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 • Unique Challenges • During this internship, you will work to develop actual features integrated into the app and to improve the operation of the app. We hope that, by working in the same environment as our full-time members, interns will not only acquire new skills and immerse themselves in the company culture but also use the internship as an opportunity for self-reflection. • At Mercari Group, you will be able to take on bold challenges without any fear of failure. What’s more, you will be able to flexibly choose the latest and optimal technologies, and because we foster an environment and culture that supports independent decision-making, the experience will offer an opportunity for both personal and professional growth. • Applications will only be accepted during certain periods in Summer and Winter. It is undecided whether applications will be open outside of these periods. The internship period can be adjusted flexibly, so please consult with us at the time of the offer.

🎯 Requirements

• Shared belief in the mission and values of Mercari Group and its various companies • (For residents in Japan only) Those who have experience using various Mercari services • Student of 16 years of age or older who would be able to join Mercari Group as a new graduate from July 2026 to June 2027 • If you have work experience as a full-time employee at another company and that experience is within the last three years, you can participate as a second new graduate. Second new graduates should include their work history in their resume. • Interest in joining Mercari Group as a software engineer after the internship is over • Basic knowledge of RDBMS and SQL • Experience developing/operating products • Experience in at least one of the following: • Backend • API development using a programming language such as Go, PHP, or Java • Frontend • Development using such things as JavaScript or React • Mobile (iOS) • Development using Swift • Platform Engineering • Development using Go and Kubernetes • Site Reliability Engineering • Development using Go, Kubernetes, and Terraform • Corporate Engineering（either one） • Development using Java / Go or PHP • Development using low code / no code • Experience with project management and/or team leadership • Ability to design and develop with performance and scalability in mind • Knowledge of object-oriented software development, networking, and memory management. • Knowledge in software test including unit testing, functional testing, and e2e testing • Knowledge of and experience with networks, Linux servers, surveillance systems, logging, and system operation • Experience with development and operation in a microservices architecture • Cloud development experience (preferably Google Cloud or AWS) • Understanding of UI development • OSS contribution experience / familiarity with OSS community • Experience with team development using Git or similar management systems • English or Japanese: Independent (CEFR - B2) • In Merpay, there are cases where Independent (CEFR - B2)-level Japanese is required • In Mercari, there are cases where Independent (CEFR - B2)-level English Independent is required