Job details

Software Engineer, React Native - US app

  • Redux
  • REST
  • TypeScript
  • iOS
  • Android
  • React Native

Posted: 2 months ago

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 Inclusion & Diversity 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 I&D Statement.

Team’s Mission / Work Responsibilities

  • Build user-facing features for our mobile app using technologies like React Native, TypeScript, and Redux
  • Diagnose and fix bugs and performance bottlenecks to achieve native-grade performance
  • Design and maintain CI pipelines to build, test, and deliver our apps
  • Maintain code and write automation testing to ensure the product is of the highest quality
  • Work collaboratively with cross-functional teams to solve key business problems
  • Introduce, socialize, and promote mobile development best practices among the team

Unique and Bold Challenges

  • Deliver product features in a fast-paced start-up style environment
  • Seek to gain a deep understanding of the US market to ensure Mercari’s continued global success
  • Work effectively in a multicultural environment with colleagues from various backgrounds

Required Qualifications

  • 5+ years of software engineering experience 
  • Ability to write clean, testable, and fully typed TypeScript code
  • Ability to write and maintain technical documentation
  • Work experience developing and shipping user-facing features on mobile applications using React Native, Kotlin, or Swift
  • Knowledge of REST APIs
  • Experience setting up and maintaining CI pipelines
  • Experience monitoring and managing apps in production

Preferred Qualifications

  • You are up-to-date with React Native best practices
  • Work experience as a mobile app engineer in consumer, e-commerce, or marketplace space
  • Familiarity with native Android and iOS APIs
  • Familiarity with Sentry or Crashlytics
  • Familiarity with Github Actions

Screening Criteria

  • We will be looking for a shared belief in Mercari’s mission and values.
  • Please provide your resume in English.
  • We will conduct interviews in English,
  • Hiring Process Overview (subject to change)
    • 1. Doc Screening
    • 2. Skill Test
    • 3. Interviews (3-4 rounds. There are some cases you will meet a few members in 1 round)
    • 4. Background check
    • 5. Offer
    • 6. Hire

See this page for details.

Language Requirements

  • Either of the following is required:
    • English: Proficient (CEFR - C1) 
    • 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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