Software Engineer, Backend [New Graduate Position]

Tokyo, Japan · Student Recruitment · EN/JP


(Japanese follows English)

▼ Our mission

We are always looking for new challenges to help us fulfill our mission to create value in a global marketplace where anyone can buy & sell.

The world is full of objects and services being produced and sold, but many of them are thrown away without people realizing that they might be valuable to someone else, wasting valuable natural resources. To contribute towards eliminating waste, we have launched Mercari, a marketplace where people can buy and sell easily and safely, in Japan and the United States.

Merpay’s mission is to build trust for a seamless society. Our aim is to change the way money is circulated, establish a Merpay that provides all kinds of services, and develop a world where everyone can enjoy peace of mind.

Merpay aims to bring liquidity and innovation to the world of finance, and create new value not just for consumers, but for businesses as well.

▼ Our three values (Go Bold, All for One, Be a Pro)

We work together to create a global marketplace, but the road to this goal is by no means easy. In order for us to make new innovations and take on new challenges that no one has taken before, all of us take ownership of our work and make use of our knowledge so that we can create the best product possible as one team. To achieve this, we all take action based on our three company values (Go Bold, All for One, and Be a Pro).

▼ The goal of the engineering organization

At Mercari, engineering teams always strive to continuously produce significant results. To do this, our organization constantly welcomes changes and new challenges, cooperates and co-creates, is diverse, offers freedom, and encourages all of us to take ownership and make our own decisions. We want to continue taking on new challenges, working together as one team, going bold, and taking ownership so that we can grow individually, while working toward the realization of Mercari’s mission.



世の中では多くのモノ・サービスが生産・販売されていますが、誰かには価値があるのに捨ててしまうなど地球資源の無駄になっていることが多いと私たちは考えています。 「捨てる」をなくすために、個人間で簡単かつ安全にモノを売買できるフリマアプリ「メルカリ」を日本とアメリカで展開しています。




▼ 3つのバリュー(Go Bold, All for One, Be a Pro)

世界的なマーケットプレイスを創るために我々は集まっていますが、この目標への道のりは決して平坦ではありません。まだ誰も挑戦したことのないようなイノベーションや破壊的な創造を起こすため、我々は各自がオーナーシップを持ち、専門的能力を発揮することで、メルカリというチームとして最高のプロダクトを創ります。これを達成するために我々は3つのバリュー(Go Bold, All for One, Be a Pro) という全社員が共有する行動指針のもと行動しています。

▼ Engineering 組織が目指すもの


チーム一丸となり、Go Boldにオーナーシップを発揮して個が成長し、メルカリのミッションの実現に向けた挑戦をし続けていきます。

▼Job Description

・Designing, developing, and operating various microservices along with inter-microservice design using gRPC

・Leading the team’s development using a variety of new ideas

・Improving services and measuring effectiveness using quantitative and qualitative analysis on user action logs, etc.

・Designing architecture and selecting middleware based on application requirements

・Microservice performance tuning, monitoring, and alert handling

▼ About Mercari & Merpay’s Backend Teams

Mercari and Merpay’s Backend engineers are part of a diverse organization. They are required to design, develop, and operate systems such as servers and databases, as well as ensure the success of the product’s development.

In addition to backend tasks, engineers should be able to improve the customer experience through design, create user stories to solve issues found through analysis, and communicate smoothly with engineers from various fields.

We expect engineers to take leadership and come up with a wide variety of new ideas through these tasks.

▼ Technical environment

・Development languages: Go, PHP, JavaScript

・Middleware: MySQL, Memcached, Nginx, Solr, Docker, Kubernetes

・Infrastructure: On-Premises, Google Cloud Platform, Amazon Web Service

・Configuration management tool: Terraform

・Analysis infrastructure: BigQuery / Looker / Data Studio

・Development methods: Agile (Scrum, Kanban, etc.)

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




・各種Microservicesの設計、開発、運用とgRPC を用いたマイクロサービス間の設計





▼メルカリ/メルペイ Backendチームについて





・開発言語: Go, PHP, JavaScriptなど

・ミドルウェア: MySQL, Memcached, Nginx, Solr, Docker, Kubernetes など

・インフラ: On-Premises, Google Cloud Platform, Amazon Web Service


・分析基盤:BigQuery / Looker / Data Studio

・開発手法: Agile (Scrum, Kanban, etc.)

・その他: Slack, JIRA, GitHub, Circle CI, Spinnaker など


▼ Minimum Requirements

・Shared belief in Mercari and Merpay’s mission and values

・Candidate must be a student over 16 years old who will be available to join the company after 2020

・Experience developing/operating products

・Experience designing, developing, and operating software applications using Go or PHP

・Experience designing DBs (RDB, NoSQL, etc.) and creating efficient queries

・Ability to design, develop, and operate large-scale services while considering factors like traffic


・Extensive knowledge of standard web technology along with a field of specialty, understanding of library and framework characteristics, and ability to properly implement them in projects

・Experience with development and operation using the public cloud

・Experience launching new services and dealing with challenges faced by growing services

・Ability to proactively and continuously improve applications

・Experience with development and operation within a microservice architecture

・Experience with team-based development using scrums

・Experience with replacing legacy codebases with modern codebases

・Experience making contributions to the industry through work on OSS projects

・Experience presenting at technical conferences or study sessions

▼ Our Ideal Candidate

・A skilled communicator capable of offering valuable insight in team discussions

・Capable of taking on bold challenges and learning from mistakes

・Proactive and capable of thinking independently for the good of the team

・Eager to gain new knowledge and ready to proactively challenge themselves using the newest technologies

▼ Language Ability

・Business level English or Japanese






・DB (RDB, NoSQL, etc.) 設計及び、効率的なクエリ作成経験












▼ 求める人物像





▼ 言語能力



▼Employment status

・Full Time

Probationary Period: 3 months (salary same as above)

*We hold an orientation for new graduates every April and October


・Roppongi Hills Mori Tower 6-10-1 Roppongi Minato-ku Tokyo 106-6118

▼Work Hours

・Fixed working hours 10:00-19:00

・Flex time (core hours 12:00-16:00, 60 minute lunch)


・Annual salary, paid monthly

・Based on your experience, skills and potential

・Reviewed twice a year


・Two days off per week, Japanese national holidays, New Year's vacation etc.

・Paid Leave, Bereavement Leave, Relax Days, Sick Leave









 フレックスタイム制度あり(コアタイム:12:00~16:00 [休憩60分] )







・完全週休2日制(祝祭日、年末年始 等)

・有給休暇、慶弔休暇、リラックス休暇、Sick Leave


・Health insurance

・Incentive program

・Employee stock ownership plan

・Full transportation coverage

・Custom PC

・Dual screen if needed

・Company smartphone

・Visa support

・New Employee Benefits at Mercari「mercibox











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