Software Engineer, Backend [US App]


Our Mission

Mercari’s US business started operations in 2014. With a mission to make selling easier than buying, Mercari US aims to provide a service where people can easily sell almost anything online. The US business still hides tons of untapped growth potential, through shipping innovations such as the expansion of same-day delivery, automation that mitigates users’ price-setting confusion by suggesting prices, and other features. In order to facilitate the US business’s development while generating synergy with Mercari’s Japan business, our US operations are developing their product not only in the US offices, but in Japan (Tokyo) as well. Mercari US is a foundational pillar in building towards Mercari Group’s mission of “create value in a global marketplace where anyone can buy & sell.” Will you join us in taking on this mission?

*This position is for the Mercari US Tokyo office. If you are looking for a position in a US office, please check the Mercari US careers page.

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, the culture will remain essential to achieving our mission and is evidenced throughout our organization.

Work Responsibilities

  • Design, develop, test, deploy, maintain, and improve backend software
  • Write code in Go and PHP
  • Work with Product Managers and Designers
  • Collaborate with iOS and Android Engineers to develop new features
  • Collaborate with QA Engineers to deliver high-quality features quickly
  • Work with third-party vendors to integrate new functionality
  • Solve complex architectural challenges
  • Write and maintain technical documentation

Bold Challenges

  • Develop product features in a fast-paced Silicon Valley startup environment
  • Design highly scalable systems that can support the continued growth of Mercari US
  • Proactively share ideas and contribute to our engineering culture
  • Gain a deep understanding of the US market to ensure Mercari’s continued success
  • Work effectively in a multicultural environment with colleagues from various backgrounds

Required Experience

  • 3+ years of industry programming experience
  • Professional engineering experience with consumer applications
  • Exceptional communication skills
  • Experience developing complex software systems scaling to millions of users with production-quality deployment, monitoring, and reliability
  • A positive attitude and an insatiable desire to learn

Preferred Experience

  • Experience with PHP or Go
  • Experience designing, developing, and managing microservices
  • Experience with Docker and Kubernetes or similar systems
  • Experience working on GCP or AWS or similar systems
  • Excellent knowledge of distributed systems
  • Demonstrated ability to write code with appropriate tests
  • Experience leading or managing teams
  • Experience working in large, cross-functional teams
  • Experience mentoring engineers
  • Experience working in an Agile environment
  • Experience with JavaScript ES6 and modern frontend frameworks such as React, Angular or Vue

Screening Criteria

  • Please provide your resume in English.
  • We will conduct interviews in English.
  • We will be looking for a shared belief in Mercari’s mission and values.
  • Hiring Process Overview (subject to change
    1. Doc screening
    2. Skill test via GitHub (We will check Go or PHP skill)
    3. Interviews (3-4 rounds. There are some cases where you will meet multiple members in one round)
    4. Background check
    5. Offer
    6. Hire
  • *Check here for more details

Language Requirements

  • English: Business level
  • Japanese: Conversational (optional)

Related Articles

  • Mercari US CEO John Lagerling’s views on a Mercari-like organization and people
  • Manager or player? Conversation with @deme, EM of the Mercari US backend team

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.)

Office Location


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 installments (monthly)
  • 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.

Corporate Sites

  • Mercari, Inc.
  • Mercari US

Owned Media

  • Mercari Careers
  • Mercari Engineering Portal
  • Mercan – Introduces the people that make Mercari
  • Mercari US Careers
  • Mercari US Blog

About Mercari

About Mercari Mercari is a marketplace app that makes it easy for people to safely sell and ship their things. Launched in 2013, the Mercari app has been downloaded over 100M times in Japan and the US. It's now among the largest peer-to-peer selling platforms globally. From fashion to toys, shoes to electronics and beyond, Mercari's mission is to create value in a global marketplace where anyone can buy and sell. Our 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).