Mercari, inc. is hiring a

Software Engineer (Web Platform Engineering) - Mercari

Minato City, Japan

This position requires English language ability. JD is available in English only.  本ポジションは日本語JDの用意がありません。




Circulate all forms of value to unleash the potential in all people

"What can I do to help society thrive with the finite resources we have?" The Mercari marketplace app was born in 2013 out of this thought by our founder Shintaro Yamada as he traveled the world. We believe that by circulating all forms of value, not just physical things and money, we can create opportunities for anyone to realize their dreams and contribute to society and the people around them. Mercari aims to use technology to connect people all over the world and create a world where anyone can unleash their potential.For more information about Mercari Group’s mission, see Mercari's Culture Doc.


Equal Opportunity Hiring

Here at Mercari, we work to realize a world in which no one’s potential is limited by their background and everyone has the opportunity to freely create value. We also firmly believe that a mindset of Diversity & Inclusion is essential for us to achieve our mission.

This, of course, extends to our hiring practices as well. Mercari is committed to eliminating discrimination based on age, gender, sexual orientation, race, religion, physical disability, and other such factors so that anyone who shares our mission and values can join us, regardless of their background. For more details, please read our D&I Statement.


Team’s Mission / Work Responsibilities

Team mission:

The Web Platform team is responsible for helping engineers at Mercari and its subsidiaries build and deliver better products to our customers.  We provide a web microservice platform as a service to enable new business and make the work of engineers easier.

(Learn more about Mercari's mission and values here.)

Specific work responsibilities include the following:

  • Design, develop, and maintain platform features and tooling that support the entire software development cycle from build to test through to deployment and operation
  • Support migration and adoption of new platform features and tooling
  • Work with Security and Site Reliability Engineering teams to improve the platform's security and reliability.
  • Reduce engineering overhead by improving and automating platform operations.
  • Communicate with internal developers to understand their needs


Unique and Bold Challenges

  • This is a position with a significant impact across all Mercari group companies, affecting the whole organization's engineering development and product quality.
  • The team needs to understand what the developers are struggling with and what is required for the Mercari Group’s product development. With this empathy and collection of requirements, the team prioritizes the problems to solve and decides the solution for them. You can join this decision-making process and propose a pragmatic solution leveraging your knowledge and experience.


Required Qualifications

  • Shared understanding and belief in our company’s mission and values
  • Demonstrated experience working with, and expertise around Kubernetes in a large-scale production environment.
  • Experience in infrastructure management, automation, and system architecture design with a solid knowledge of Networks, HTTP protocol, Linux servers and monitoring systems in production
  • Experience in writing design docs or proposals and in reaching agreements with stakeholders
  • Experience in operating and administering cloud platforms (GCP or AWS) in production
  • Experience in developing Web applications/services using Go, Node.js and building effective CI/CD pipelines (GH Actions is preferable)


Preferred Qualifications

  • Experience in project management and/or team leadership
  • Experience in Web Frontend development (TypeScript, React is preferable)
  • Ability to design and develop with performance and scalability in mind
  • Exposure to software testing including unit testing, functional testing, and e2e testing
  • Experience in developing and operating in a microservices architecture


Screening Criteria

  • Capable of working independently and taking initiative to lead the team to success
  • Thinks about what’s best for the product and how they can provide the most value through technology
  • Sees diverse changes as opportunities for constant improvement and development
  • Is able to consistently come up with ideas for improvement and act upon them

  (See this page for details.)


Key Points for Technical Assignments

  • Capable of implementing web API’s 
  • Comfortable working on coding problems and working with data structures and algorithms


Language Requirements

  • English: Independent (CEFR - B2) required
  • Japanese: Basic (CEFR A2) optional

  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

  • Full flextime (no “core time” or “flex time”)
    *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 the employee’s family members
    *See this page for details.



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