What is a Mobile Engineer at Mercari?
As a Mobile Engineer at Mercari, you are responsible for building and scaling Japan’s largest peer-to-peer marketplace app, as well as its rapidly expanding global platforms and financial services like Merpay. This role sits at the intersection of high-scale system design and customer-centric feature development. Millions of active users rely on these mobile clients daily, making performance, security, and intuitive user experiences paramount to the company's business success.
You will work in a highly collaborative, cross-functional environment alongside product managers, designers, backend engineers, and quality assurance specialists. The engineering culture at Mercari values autonomy, clean architecture, and technical excellence. Mobile engineers are expected to take complete ownership of their features, from initial architectural design to deployment and post-launch optimization.
Whether you are optimizing image-upload pipelines, implementing secure payment flows, or refactoring legacy modules to improve developer velocity, your work directly impacts the daily transactions of millions of users. The technical challenges are diverse, spanning complex state management, offline-first capabilities, and localized user experiences across different international markets.



