Software Engineer, iOS (Platform Product)

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 

Organization/Team Mission

Mercari Engineering Principles  

Mercari Engineering Principles are a shared understanding that serves as the foundation of engineering beliefs and behavior at Mercari. The Engineering Principles are designed to complement the organizational identity (Mercari’s mission, values, and culture) from an engineering viewpoint. 

These principles ultimately help us achieve Mercari’s mission by defining the ideal state we seek to realize in the long term. 

• Passion For The Product
• Grow Together
• Solve Through Mechanisms
• Collaborate Openly

For more details, please see the following link:

Team mission and expectations of the role

• We are looking for a professional iOS engineer to to take ownership from planning through development for Merpay’s new payment and finance services, based on the company’s mission of “building trust for a seamless society.”
• At Merpay, multiple iOS engineers are assigned to each domain and drive their respective domains forward. In this position, you will leverage deep expertise in iOS app development using Swift, collaborating with product managers, designers, backend engineers, and QA/Test engineers. 
• As part of the Merpay Platform, you will work on developing core product features (such as identity verification, bank integrations, and our internal server-driven UI infrastructure), as well as features to drive growth initiatives.
• In addition to feature development, you will also focus on improving quality, testing, automation, and stabilizing releases, actively improving the developer experience.
• In the future, we welcome engineers who are willing to proactively work beyond traditional role boundaries of an iOS app engineer, including working across Android, Web, backend, or even into roles such as product management or QA.
• We are strongly promoting an AI-native approach. At the same time, we place great importance on ensuring we never compromise correctness, security, privacy, or user trust. Rather than whether AI tools are used, we value the ability to properly validate outputs and take full responsibility for quality in development.
• You will work in a diverse, global environment with team members from various backgrounds, including English speakers. While perfect English proficiency is not required at this stage, we welcome those who are comfortable working in English.
• We encourage and value external contributions such as:
• • Speaking at domestic and international conferences such as try! Swift and iOSDC
  • Writing articles on the Mercari Engineering Blog
• For more details about Mercari’s mission and values, please refer to the following.

See  for more information about our mission and values.

Work Responsibilities

Job Description

• Design, development, and improvement of new features related to Merpay’s core platform functions
  (e.g., identity verification, bank integrations, internal server-driven UI infrastructure)
• Team-based development in collaboration with product managers, designers, backend engineers, and QA/Test engineers
• Improving code quality and enhancing the development environment
• Conducting code reviews for team members
• Creating prototypes and proofs of concept (POCs) to introduce new iOS-related technologies

Tech Stack

• SwiftUI
• Combine, Concurrency
• Protocol Buffers
• Bazel
• GitHub Actions
• Claude Code
• Cursor
• Internal AI agents

Note: These are the primary technologies currently in use. Experience with all of them is not required at the time of joining.

Unique Challenges

• Delivering one of Japan’s leading smartphone payment apps to users with both high speed and high quality to millions of users
• Tackling challenges that require advanced development skills, including standard security practices in financial/payment services as well as mobile app–specific security considerations
• Navigating both iOS platform constraints and business requirements
• Collaborating in a team with members from diverse backgrounds, including different languages, genders, and nationalities
• Going beyond feature development to evolve the developer experience and AI-native development workflows themselves
  

Qualifications

Required Experience & Skills

• Alignment with the mission and values of the Mercari Group and its companies
• Passion for the financial services domain
• Experience developing native iOS applications using Swift
• Knowledge of iOS standard libraries and frameworks
• Experience in team-based application development in collaboration with product managers, designers, backend engineers, and QA
• Willingness to go beyond iOS and work across adjacent domains when needed
• Strong interest in AI-native development, with the ability to validate correctness, maintainability, and safety

Preferred Experience & Skills

• Experience developing and operating native applications with a large user base
• Deep knowledge of UI development using SwiftUI
• Experience in Fintech or KYC domains
• Strong knowledge of writing testable code
• Experience with development process and release automation
• Hands-on experience with the Bazel build system
• Knowledge of performance optimization
• Contributions to OSS, technical blogging, or speaking at conferences

Language Requirements
Candidates should meet one of the following:

• English: Independent (CEFR B2) / Japanese: Basic (CEFR A2) — preferred
• Japanese: Independent (CEFR B2) / English: Basic (CEFR A2) — preferred

For details about CEFR, see .

　

Learn More About Mercari Group

• Careers site:    
• Mercan:   
• Social media:  /  
• (only available in Japanese)
• (Only available in Japanese)
• (Only available in Japanese)
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Recruiting at Mercari

At Mercari Group, we value empathizing with and embodying the mission and values ​​of the Group and each company. To promote the creation of an organization that maximizes the total amount of value exhibited by all members, we would like to understand the experience and skills of each candidate as accurately as possible.

Recruiting cycle at Mercari Group

• Application screening
• Skill assessment: For engineering positions, you will be asked to complete a skill assessment on HackerRank or GitHub. For non-engineering positions, you may be asked to complete an assessment depending on the position. (The timing of the assessment may coincide with the interview process.)
• Interview: The number of interviews may vary depending on the position.
• Reference check: We will ask for online references around the timing of the final interview.
• Offer: Offers will be determined carefully in consideration of the final interview and the reference check.

　Learn more about our recruiting process .

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 .

Please read and acknowledge our  prior to submitting your application.