Software Engineer, Frontend (Summer Internship)

Tokyo, Japan · Student Recruitment · JP


At Mercari, our mission is to create value in a global marketplace where anyone can buy & sell, and we pride ourselves in taking on a challenge. We are looking for new members to join us in achieving this goal under our values - Go Bold, All for One, and Be a Pro.

株式会社メルカリでは「新たな価値を生みだす世界的なマーケットプレイスを創る」というミッションを掲げ、あらゆる挑戦をしています。「Go Bold - 大胆にやろう」「All for One - 全ては成功のために」「Be a Pro - プロフェッショナルであれ」という3つのバリューのもと、ミッション達成を共に目指していける仲間を募集しています。

Internship content

Interns enrolled in this program will be provided with the opportunity to work alongside other software engineers, and contribute to the development of Mercari’s services.

This internship will provide those enrolled with the chance to learn about frontend development not just in terms of our native application, but also from a frontend web perspective (JavaScript, HTML, CSS) by mastering the frontend tools that we use. In general, Interns will contribute to the development of any Mercari products or tools that use web technologies. This includes, but is not limited to: The transaction screen and the coupon function used by the native app and the web app, customer support tools used to manage transactions and inquires, merchant support tools to manage inquiries from Merpay’s merchants, dashboards provided to Merpay merchants, Mercari guides, and Mercari Box.The team contributes to Mercari’s sustained growth through these products.The team contributes to Mercari’s sustained growth through these products.

Languages and technologies we use


Languages: HTML, CSS, JavaScript (TypeScript, React.js, Next.js, Redux, etc)

Infrastructures: Google Cloud Platform (Compute Engine, Kubernetes Engine, App Engine)

Configuration management tool: Terraform

Other: Circle CI, GitHub, Slack, JIRA, Crowi, Spinnaker


Language: HTML, CSS, JavaScript (TypeScript, Vue.js, Nuxt)

Infrastructure: Google Cloud Platform (Compute Engine, Kubernetes Engine, App Engine)

Configuration management tool:Terraform

Other:Circle CI, GitHub, Slack, JIRA, Crowi, Spinnaker


メルカリに在籍するSoftware Engineerと同じ環境でフリマアプリ「メルカリ」の機能開発に挑戦して頂きます。



技術面では、ネイティブアプリを含む広義の Frontend ではなく、JavaScript / HTML / CSS で構成されるいわゆる Web Frontend の技術を駆使して開発をインターンを通して学ぶ機会があります。特にFrontendチームでは、昨今の PWA や SPA / SSR などに対する注目の高まりを受けて、メルカリグループ内でのよりモダンな Web 技術をベースにしたプロダクト開発を強化しようと取り組んでいます。主な開発範囲としては、メルカリの Web アプリ、ネイティブアプリ内で呼び出される取引画面やクーポン機能、お客さまのお問い合わせや取引のサポートをするカスタマーサポートツール、メルペイの加盟店さまのお問い合わせをサポートする加盟店サポートツール、メルペイの加盟店さまに提供するダッシュボード、メルカリガイド、メルカリBoxなど、メルカリのプロダクトに関わる全てのWeb技術を使った製品に責任を持ちます。私達はこれらのプロダクトを通して、持続可能なメルカリグループの成長に貢献しています。




▼Internship period

August 16, 2019 - September 15, 2019




▼ Entry requirements









▼Employment status


▼Work location


▼Work hours

10:00 - 19:00 (60-minute break)


Daily wages of 20,000 Yen (Travel expenses reimbursed separately(*))

(*) We will reimburse round-trip travel expenses and provide lodgings for those commuting from far-away.

How to apply

Please apply for this internship through the entry form.

* Please submit any work that can be disclosed to the public (we prefer looking at any source code under GitHub accounts, etc.) and a resume.

▼Reference materials [FYI]

▽ Mercari Engineering Blog

▽ Summer Internship 2017 “Know Your Worth and Multiply It!”

▽ [Mercari Summer Internship] Color Recognition Using Item Images

▽ Cancellation Prediction Based On Chat Messages






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