• Serve as a primary developer for Perc Ultra SMP (32‑bit) and Perc 64 (64‑bit) • Plan and execute development tasks; troubleshoot issues and clear blockers • Implement bug fixes, feature enhancements, and major new release content • Develop and maintain regression tests for fixes and new functionality • Review, test, and approve code changes from team members before commit • Collaborate with Developer Tools leadership to maintain and update licensing components • Work directly with customer engineering teams to diagnose issues, resolve technical questions, and advise on best practices

• 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. • 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. • 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. • During this internship, you will work to develop actual features integrated into the app and to improve the operation of the app. • 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.

• Design, develop, and maintain full stack features using Node.js, React.js, and Next.js • Build and optimize backend services and APIs with Node.js • Work with PostgreSQL to design schemas, write efficient queries, and improve performance • Develop responsive and performant frontend applications using React, Redux, and Redux-Saga • Collaborate with cross-functional teams to understand requirements and deliver solutions • Write clean, maintainable, and well-tested code • Participate in code reviews and contribute to engineering best practices • Debug, troubleshoot, and resolve production issues

• define the software architecture and contribute to developing the next generations of lithography systems, driving innovation in the semiconductor industry • find optimal solutions for embedded systems while addressing constraints such as system, hardware, and performance requirements • analyze system requirements, collaborate on technical specifications, and propose and decide on solutions together with the team • define the technology stack and critical interfaces • communicate effectively with internal and external stakeholders, including software developers, Product Owners, and electronics teams