About Mercari
Mercari is a Japan-based C2C marketplace company founded in 2013 with the mission to “Create value in a global marketplace where anyone can buy & sell.” From being the first tech unicorn from Japan before its IPO in 2018 we have come a long way towards becoming a global player and continuously and diligently work towards our transformation journey with a strong focus on our mission.
Since its inception, Mercari Group has worked to grow its services, investing in both our people and technology. Over time, Mercari has expanded from being the top player in the C2C marketplace in Japan to new geographies like the U.S. We have also successfully launched new businesses such as Merpay, which is a mobile payment service platform with a vision to create a society where anyone can realise their dreams through a new ecosystem centered not only on payment service but also on credit. Today, Mercari Group is made up of multiple subsidiary businesses, including logistics, B2C platform, blockchain, and sports team management.
About Mercari IndiaEstablished in Bangalore in 2022, Mercari India serves as a crucial technology hub for the Mercari Group. Leveraging the rich and diverse tech talent in India, we primarily collaborate closely with our development hub in Japan to drive engineering development for Mercari's applications. Having grown to an organization of approximately 100+ members over about four years since its inception, Mercari India aims to evolve into an even stronger engineering organization that spearheads technological innovation for the entire group. This will be achieved by further enhancing our engineering capabilities and promoting AI initiatives that reflect India's cutting-edge technology and knowledge.
Our Culture
To achieve our mission at Mercari, our organisation and each of our employees share the same values and perspectives.
Our individual guidelines for action are defined by our four values:
- Go Bold
- All for One
- Be a Pro
- Move Fast
Our organisation is also shaped by our four foundations:
- Sustainability
- Diversity & Inclusion
- Trust & Openness
- Well-being for Performance
Regardless of how big Mercari gets, the culture will remain essential to achieving our mission and something we want to preserve throughout our organisation.
We invite you to read the Mercari culture doc that summarizes the behaviours and mindset shared by Mercari and its employees. We continue to build an environment where all of our members of diverse backgrounds are accepted and recognised, and where they can thrive while holding dear to Mercari’s culture.
About RoleWe are looking for a frontend engineer to own Mercari's web experience end to end. At Mercari, engineers work as Product Development Engineers (PdEs): you hold a deep specialization in frontend, and you use it to define what to build, prototype early, and stay accountable through release and production. Beyond your own delivery, you are the frontend enabler for cross-platform engineers - Backend, iOS, Android, and QA - joining technical discussions and planning early so they can work AI-natively in web code instead of waiting on you. This is a hands-on role on a large-scale product where rendering strategy, Core Web Vitals, and SEO directly shape the buying and selling experience.
Job Responsibilities- Own frontend delivery end to end: problem definition, AI-assisted prototyping, implementation, release, and production ownership — observability, rollback, and follow-through on incidents.
- Build and evolve large-scale web applications with React and Next.js, owning rendering strategy, Core Web Vitals, and SEO for the buying and selling experience.
- Act as the frontend specialist and enabler for cross-platform engineers (backend, iOS, Android, QA): review their web changes, pair with them, and set the patterns, guardrails, and AI skills that let them ship safely.
- Join technical discussions and planning as the frontend voice — scope, architecture, sequencing, trade-offs — and turn incomplete specs into working prototypes so decisions don't stall.
RequirementsSkills Needed
- Frontend: HTML5, CSS3, JavaScript (ES6+), TypeScript, React, Next.js, RSCs, SWR, Jotai (or similar state management library like Redux, Context API, etc.)
- Testing: Playwright, Jest, Vitest, Storybook
- APIs: ConnectRPC, protobuf
- Development tooling: pnpm, Turborepo
- Infrastructure: Google Cloud Platform
- AI-Assisted Development: AI coding assistants, skills
- Other Tools: GitHub, GitHub Actions, Slack, Jira, Octopus Deploy, Datadog, Sentry
- Alignment with Mercari Group's mission and values.
- 5+ years of frontend experience with JavaScript, TypeScript, React, and Next.js, including hands-on App Router and SSR.
- Experience developing and operating large-scale products.
- Performance and scalability focus, including Core Web Vitals.
- Solid HTML and CSS skills, with expertise in ensuring cross-browser compatibility.
- Proficiency with Git, including within a monorepo structure.
- Effective use of AI coding assistants: skills and project instructions, efficient token usage, matching model and effort to task criticality, and thorough review of all AI-generated code.
- Willingness to work beyond the frontend boundary when the product needs it, with frontend depth as the foundation.
- Strong communication skills.
- Experience moving CSR pages to SSR while preserving SEO and performance.
- Ability to evaluate and introduce new libraries and frameworks.
- Architecture design and/or TDD based on application characteristics.
- Proactive approach to continuous application improvement.
- Experience with SEO, structured data, and internationalization (i18n).
- Hands-on work with design systems and automated testing.
- Experience creating AI skills and agent workflows.
- Knowledge of accessibility standards (WCAG).
- Cloud platform experience (GCP preferred, or AWS).
- Familiarity with CI/CD and release processes.
- Open-source contributions.
Benefits
- Employment Status: Full-time
- Office Location: Bengaluru, India
- Hybrid Workstyle: 2 days work from office / 3 days work from home per week.
We believe in high performance and professionalism. To build a strong and highly engaged organization in India, we encourage everyone to work from our Bengaluru office, especially during the setup phase. We continuously review and update our policies to align with future organizational needs.
Media & ResourcesOwned Media- Mercari Engineering Portal
- Mercan - Introduces the people that make Mercari
- Mercari US Blog
- https://engineering.mercari.com/en/blog/entry/20210810-the-new-mercari-web/
- https://engineering.mercari.com/en/blog/entry/2020-04-15-112744/
- https://engineering.mercari.com/en/blog/entry/20210630-connecting-the-dots-web-accessibility-through-internationalization-and-localization/
https://mercan.mercari.com/articles/29662/
Skills Required
- Shared understanding of and belief in Mercari Group’s mission and values
- At least 2–5 years of frontend development experience
- Experience with web browsers, JavaScript, TypeScript, React.js, Next.js, and Redux
- Experience developing and operating large-scale products
- Ability to design and develop with performance and scalability in mind
- Ability to use HTML and CSS to develop solid user interfaces
- Knowledge of JavaScript and experience with UI libraries or frameworks such as React
- Strong understanding of cross-browser compatibility and web development best practices
- Understanding of version management and ability to participate in development using Git
- Effective communication skills for collaboration with product and engineering teams
- Extensive knowledge of standard web technologies and specialized knowledge in TypeScript, React.js, Next.js, or Redux
- Understanding of different libraries and frameworks and ability to introduce them appropriately
- Ability to design application architecture
- Ability to take initiative in implementing application improvements
- Cloud development experience, preferably with GCP or AWS
- Experience contributing to an open-source project
- Familiarity with CI systems and release processes
What We Do
Mercari is a C2C marketplace app allowing anyone with a smartphone to easily sell items they no longer need, providing a new and unique user experience. In the past, buying and selling secondhand items has commonly been done at physical shops. However, this came with issues: the travel time required to go to these shops, the limited selection of items these shops carry, the unclear prices for both the buyer and seller alike due to the involvement of dealers, and more. Online auction websites for buying and selling secondhand items came with their own problems, including difficult listing procedures and long bidding times. On Mercari, anyone can use their smartphone to easily buy and sell items. We also provide easy and inexpensive shipping options thanks to our partnerships with delivery companies and convenience stores. As our service is catered to individuals on both the buying and selling sides, anyone can experience the fun of easily selling unneeded items for money and the excitement of finding unique secondhand items to buy. With the technological capabilities and extensive user and information bases built through Mercari, we launched the Merpay mobile payment service in 2019, the B2C marketplace Mercari Shops in October 2021, and the cryptoasset exchange service Mercoin in March 2023. We strive to continuously enhance the user experience and expand our businesses
