Class of 2028, 28卒対象 / Software Engineer Internship - Mercari Group

JD in Japanese follows. 英文の後に和文JDをご覧いただけます。

Class of 2028, 28卒対象 / Software Engineer Internship - Mercari Group

Mercari is far from a "finished product." It is precisely because we are a work in progress that there is so much room for transformation. We are looking for future leaders—those who will start on the front lines, eventually shape our strategy, and drive both our product and organization forward. Come build the future of Mercari with us.

Target Applicants

• Target Applicants: Those who can join as new graduates in October 2027 or April 2028 .
• 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. A 2-3 months of Internship is encouraged. Please consult with the recruiter if you prefer shorter/longer period
• Airline ticket arrangements will be provided only to candidates who have not yet purchased their tickets at the time the internship offer is made.
• Office: in Japan (Remote or Roppongi)
• Application Deadline: November 30, 2026, 23:59 (JST)

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

This internship offers the opportunity to work on experience design from a management perspective—not just engineering—and to grow into a leader who will drive the future of the Mercari Group. For students aspiring to become product leaders, it provides the chance to take on challenges that contribute to both business growth and solving social issues.

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

Work Responsibilities

• You will be challenged with developing features for the flea market app "Mercari," the smartphone payment service "Merpay," and the cryptocurrency/blockchain service "Mercoin" within Japan. You will join a team of software engineers with diverse backgrounds and expertise and take on responsibilities as a team member.
• Regarding specific tasks, you will be involved in projects aimed at improving the user experience (UX) and specifications from the customer's perspective for Mercari, Merpay, and Mercoin. Currently, Mercari is implementing various initiatives, such as improving the search interface and measures related to listing and purchasing. You will engage with the technology and data firsthand and produce tangible outputs.
• Ultimately, you will present your work and actual results at a final report meeting. You can read about the achievements and lessons learned by past interns on Mercari’s owned media site, Mercan.
• An Intern’s Authentication Migration Challenge: Introducing OAuth 2.0 to Merpay’s Merchant Dashboard
• Crossing Boundaries in Software Development with AI: Three Months Tackling Backend Engineering as a Mercari Intern
• Internship Story: Re-architecting the Settlement Service That Supports Merchant Settlements

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.

Qualifications

• Those who are interested in management and building an engineering organization and culture as a leader candidate (CTO, VPoE, etc.) who will lead the Mercari Group organization in the future.
• Those who can express what they want to do through their output and co-create with teams and organizations.
• Those who enjoy change and can boldly take on challenges even in unfamiliar areas or difficult situations.
• Shared belief in the mission and values of Mercari Group and its various companies
• Students aged 16 or older who are expected to join the Mercari Group as new graduates in October 2027 or April 2028.
• 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 the Mercari Group as a software engineer after completing the internship
• Possessing one of the following 5 "BOLD" characteristics:
• Visionary mindset with a strong drive to execute : Those who can continue to challenge transformation against fundamental issues.
• Ability to inspire and mobilize others : Those who can attract others and form teams themselves.
• Insatiable intellectual curiosity: Those who can learn and continue to evolve on their own.
• Grit regardless of the environment: Those who can get their hands dirty and commit to results even in adversity.
• Co-creation with AI: Those who can maximize output using technology as a weapon.

Required Experience / Skills

• (For residents in Japan only) Those who have experience using various Mercari services
• Experience in delivering results through projects utilizing the latest AI technologies and tools
• Basic knowledge of RDBMS and SQL
• Experience developing/operating products
• Practical or research-level development experience in at least one of the following:
• Backend: API development experience using languages such as Go, PHP, or Java.
• Frontend: Development experience using JavaScript, React, etc.
• Mobile (iOS or Android): Development experience using Swift or Kotlin .
• Platform Engineering: Development experience using Go and Kubernetes.
• Site Reliability Engineering: Development experience using Go, Kubernetes, and Terraform.
• Data Engineer: Experience in data aggregation, analysis, or visualization using Python, SQL, etc.
• Security Engineer: Development experience using programming languages such as Go, Python, PHP, or JavaScript.

Preferred Experience / Skills

• An interest in leading businesses and organizations, with a desire for a future management career.
• Experience producing tangible results in a business setting, such as through internships or entrepreneurship.
• 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

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