Software Engineer, Web Platform [Mercari] at Mercari (Tokyo, Japan)

Software Engineer, Web Platform [Mercari] at Mercari (Tokyo, Japan)

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Location: Tokyo, Japan
Type: Full Time
Created: 2021-12-15 05:00:37

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Our Mission

Mercari is a Japan-based company with the mission of “create value in a global marketplace where anyone can buy & sell.” Having continuously worked toward this goal since our founding in 2013, we are now transforming from a startup into a global player. While this transformation brings its own specific set of challenges, we believe that solving them one after another will allow us to fully achieve our mission. Are you interested in working together to take on these exciting challenges?

Our Culture

Mercari’s culture has been central to the company since our founding, with the three core values of Go Bold, All for One, and Be a Pro. In addition, the “Trust & Openness” value was introduced to embody our culture of mutual trust, where information remains transparent and rules are kept to a minimum. Regardless of how big Mercari gets, our culture is essential to achieving our mission and will be promoted throughout our organization.

Position Overview

Work Responsibilities

  • We are the team that provides the web infrastructure and common functionality for the Mercari Group's web applications. Our responsibility includes:

    • Develop and maintain authentication pages and APIs on web

    • Develop and maintain infrastructures and services to provide HTML and other web related contents

    • Develop and maintain infrastructures and tools to improve reliability, productivity and security for web applications

    • Cooperate with frontend teams to develop and maintain the web application.

Bold Challenges

  • Our team is trying to improve both the quality and productivity of Mercari's web applications. We use our knowledge of all aspects of the web, including front-end, back-end, infrastructure, and security, to provide infrastructure and services. For example, we did these actions:

    • Design authentication flow based on OpenID Connect specification, implement authentication screens and APIs by React, TypeScript and Go

    • Provide network routing with canary release feature for web applications on Kubernetes infrastructure

    • Provide Google Authentication and Pull Request environment for web development on Kubernetes infrastructure

    • Provide End-to-End testing infrastructures and visual regression testing infrastructures, and run them on each pull request

Required Experience

  • Shared belief in Mercari’s mission and values

  • Experience developing and/or operating web applications

  • Experience in at least one of the following:

    • Web frontend development experience using JavaScript, TypeScript, React, etc.

    • Experience building and operating Kubernetes infrastructures

    • Experience building and operating network infrastructures such as CDN, WAF, Load Balancer (like nginx)

  • Willingness to learn web technologies (PWA, dynamic rendering , Web Components, WebAuthn, etc) and microservice infrastructures (Kuberentes, GCP, Terraform, etc) regardless of frontend, backend, infrastructure

Preferred Experience

  • Experience of Go programming

  • Knowledge of and experience with web authentication methods such as OAuth 2.0, OpenID Connect, Single Sign On, WebAuthn, etc.

  • Knowledge about web application security

  • Experience developing and operating systems using microservice architecture

  • Experience building and operating a monitoring environment and SLO, as well as detecting and handling system failures for web applications

  • Experience with software development on GCP

Screening Criteria

  • Check here for more details

Language Requirements

  • Either of the following is required

    • a. English: Basic (CEFR - A2) / Japanese: Independent (CEFR - B2)

    • b. English: Independent (CEFR - B2)

  • Click here for more information about CEFR

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Working Conditions

Employment Status


  • Probationary period: First 3 months after joining the company. (During this period your contract conditions will be the same as that of a permanent employee.)



  • Smoking is prohibited within our offices

  • Mercari has introduced a work style policy called “Your Choice.” Each member is free to choose whether they want to work in the office or work fully remote. *Exceptions made for certain kinds of work.

Work Hours

  • Scheduled working hours: 10 AM – 7 PM

  • Currently, due to COVID-19 pandemic, we have introduced a full-flex system without core time to increase the choice of working hours and allow for more flexible working styles. (*does not apply to all positions)


  • Two days off per week (as well as national holidays, New Year's break, etc.)

  • Paid leave, congratulatory and bereavement leave, relax days, sick leave


  • Annual salary paid in 12 monthly installments (including fixed overtime allowance)

  • Based on skills, experience, and abilities

  • Reviewed twice a year


  • Complete health and social insurance

  • Incentive program

  • Support systems, including those that benefit employee family members

  • Language learning support

  • Translation/interpretation support*See this page for details.



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