Jobs / Senior Software engineer, iOS (Mobile Enablement) - Mercari
Senior Software engineer, iOS (Mobile Enablement) - Mercari
Mercari Tokyo | Hybrid
EngineeringSoftware Engineer
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Language
EN: Business
JP: None
Salary
Unavailable
See Salary Ranges
Employment Type
Full time
Job Description
- Employment Status: Full-time
- Work Hours: Full Flextime (no core time)
- Office: Roppongi
For more details, see the Overview of Our Positions section on our Careers site.
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:
- Engineering Culture
Team Mission:
The Mobile Enablement team transforms mobile development into a seamless, automated, and cross-platform ecosystem. Our mission is to deliver innovative features and user experiences to maximize product-facing impact for Mercari's business. We simplify engineering workflows, reduce repetitive tasks through automation/AI, and enable broader collaboration across teams.
By streamlining coding, testing, releases, and operations, we accelerate innovation and scalability, ensuring mobile development keeps pace with Mercari’s global growth and business needs. Join us to redefine how we build and deliver the Mercari experience!
As an iOS engineer, you will work on building features with our machine learning, backend, and infrastructure members as well as collaborating with other feature-owner iOS engineering teams.
Tech Stack
- iOS Development: Swift, SwiftUI, Swift Concurrency, Swift Testing
- Build & Tooling: Bazel, fastlane, Xcode
- API & Data: Protocol Buffers
- AI Tools: Claude Code, Codex, Cursor
- CI/CD: GitHub Actions
See here for more information about our mission and values.
Responsibilities
- Design, implement, and maintain high-quality iOS features using Swift and modern iOS frameworks.
- Own end-to-end feature development, from requirements definition through architecture, implementation, testing, and release.
- Lead architectural design for complex features and system components, ensuring maintainability, scalability, and reliability.
- Optimize app performance, startup time, memory usage, and stability across diverse devices and OS versions.
- Work closely with machine learning, backend, infrastructure, product, and design teams to deliver seamless mobile experiences, as well as other feature-owner iOS engineering teams.
- Contribute to and evolve Mercari's mobile platform, SDKs, and shared modules used across teams.
- Drive high code quality through code reviews, automated testing, CI/CD improvements, and rigorous documentation.
- Champion engineering best practices and contribute to guidelines and standards across Client Engineering.
- Stay current with the latest developments in iOS, Swift, UIKit, SwiftUI, concurrency, and mobile architecture patterns.
- Bring innovative ideas to improve user experience, developer experience, and operational efficiency.
- Take ownership of initiatives that span multiple teams, driving alignment and technical decision-making.
- Mentor junior and mid-level engineers, helping strengthen the overall technical capabilities of the team.
Unique Challenges
- In this position, you will develop iOS features for AI-driven solutions that leverage Mercari Group’s vast data assets, creating high-impact user experiences for tens of millions of users.
- Deliver highly performant and reliable functionality in a fast-paced environment with complex product requirements.
- Bridge consumer-grade UX expectations with robust engineering architecture and infrastructure.
- Influence platform-wide technical strategy, shaping the future direction of Mercari’s mobile ecosystem.
- Lead cross-functional efforts in ambiguous problem spaces where user needs and technical constraints must be balanced.
Qualifications
Required Experience/Skills
- Shared belief in the mission and values of the Mercari Group.
- Bachelor’s degree in Computer Science, Engineering, or equivalent practical experience.
- Strong proficiency in Swift and iOS development frameworks (UIKit, SwiftUI, Combine, Foundation).
- Solid understanding of mobile architecture patterns (MVC, MVVM, Clean Architecture, VIPER, etc.).
- Demonstrated experience with large-scale mobile applications and complex codebases.
- Experience integrating with backend APIs and asynchronous/concurrent programming.
- Strong analytical and problem-solving skills; ability to navigate ambiguity.
- Excellent communication skills and ability to explain technical concepts clearly.
- Passion for building user-facing mobile products.
Preferred Experience/Skills
- Experience with large-scale mobile apps serving millions of users.
- Expertise in performance optimization, instrumentation, and mobile observability (e.g., crash analysis, metrics).
- Experience with SwiftUI, concurrency (async/await), and modern iOS platform capabilities.
- Contributions to open-source iOS projects or active involvement in the mobile community.
- Experience driving technical initiatives across multiple teams or owning platform-level components.
- Familiarity with CI/CD for mobile, automated testing frameworks, and release management.
- UI/UX sensitivity and an eye for detail in crafting polished user experiences.
Language
- English: Independent (CEFR B2) Required
- Japanese: Independent (CEFR B2) Optional
For details about CEFR, see here.
About The Company
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
Apply
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Job Description
- Employment Status: Full-time
- Work Hours: Full Flextime (no core time)
- Office: Roppongi
For more details, see the Overview of Our Positions section on our Careers site.
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:
- Engineering Culture
Team Mission:
The Mobile Enablement team transforms mobile development into a seamless, automated, and cross-platform ecosystem. Our mission is to deliver innovative features and user experiences to maximize product-facing impact for Mercari's business. We simplify engineering workflows, reduce repetitive tasks through automation/AI, and enable broader collaboration across teams.
By streamlining coding, testing, releases, and operations, we accelerate innovation and scalability, ensuring mobile development keeps pace with Mercari’s global growth and business needs. Join us to redefine how we build and deliver the Mercari experience!
As an iOS engineer, you will work on building features with our machine learning, backend, and infrastructure members as well as collaborating with other feature-owner iOS engineering teams.
Tech Stack
- iOS Development: Swift, SwiftUI, Swift Concurrency, Swift Testing
- Build & Tooling: Bazel, fastlane, Xcode
- API & Data: Protocol Buffers
- AI Tools: Claude Code, Codex, Cursor
- CI/CD: GitHub Actions
See here for more information about our mission and values.
Responsibilities
- Design, implement, and maintain high-quality iOS features using Swift and modern iOS frameworks.
- Own end-to-end feature development, from requirements definition through architecture, implementation, testing, and release.
- Lead architectural design for complex features and system components, ensuring maintainability, scalability, and reliability.
- Optimize app performance, startup time, memory usage, and stability across diverse devices and OS versions.
- Work closely with machine learning, backend, infrastructure, product, and design teams to deliver seamless mobile experiences, as well as other feature-owner iOS engineering teams.
- Contribute to and evolve Mercari's mobile platform, SDKs, and shared modules used across teams.
- Drive high code quality through code reviews, automated testing, CI/CD improvements, and rigorous documentation.
- Champion engineering best practices and contribute to guidelines and standards across Client Engineering.
- Stay current with the latest developments in iOS, Swift, UIKit, SwiftUI, concurrency, and mobile architecture patterns.
- Bring innovative ideas to improve user experience, developer experience, and operational efficiency.
- Take ownership of initiatives that span multiple teams, driving alignment and technical decision-making.
- Mentor junior and mid-level engineers, helping strengthen the overall technical capabilities of the team.
Unique Challenges
- In this position, you will develop iOS features for AI-driven solutions that leverage Mercari Group’s vast data assets, creating high-impact user experiences for tens of millions of users.
- Deliver highly performant and reliable functionality in a fast-paced environment with complex product requirements.
- Bridge consumer-grade UX expectations with robust engineering architecture and infrastructure.
- Influence platform-wide technical strategy, shaping the future direction of Mercari’s mobile ecosystem.
- Lead cross-functional efforts in ambiguous problem spaces where user needs and technical constraints must be balanced.
Required Experience/Skills
- Shared belief in the mission and values of the Mercari Group.
- Bachelor’s degree in Computer Science, Engineering, or equivalent practical experience.
- Strong proficiency in Swift and iOS development frameworks (UIKit, SwiftUI, Combine, Foundation).
- Solid understanding of mobile architecture patterns (MVC, MVVM, Clean Architecture, VIPER, etc.).
- Demonstrated experience with large-scale mobile applications and complex codebases.
- Experience integrating with backend APIs and asynchronous/concurrent programming.
- Strong analytical and problem-solving skills; ability to navigate ambiguity.
- Excellent communication skills and ability to explain technical concepts clearly.
- Passion for building user-facing mobile products.
Preferred Experience/Skills
- Experience with large-scale mobile apps serving millions of users.
- Expertise in performance optimization, instrumentation, and mobile observability (e.g., crash analysis, metrics).
- Experience with SwiftUI, concurrency (async/await), and modern iOS platform capabilities.
- Contributions to open-source iOS projects or active involvement in the mobile community.
- Experience driving technical initiatives across multiple teams or owning platform-level components.
- Familiarity with CI/CD for mobile, automated testing frameworks, and release management.
- UI/UX sensitivity and an eye for detail in crafting polished user experiences.
Language
- English: Independent (CEFR B2) Required
- Japanese: Independent (CEFR B2) Optional
For details about CEFR, see here.
About The Company
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
Browse Jobs by Role
Design Jobs
Design Design Director Digital Artist Graphic Design
Illustration Motion Graphics Product Design Service Design
UI Design UX Design UX Research UX Writing
Visual Design Video Web Design
Engineering Jobs
Android Engineer iOS Engineer
Front End Developer Back End Developer
Full Stack Developer QA Engineer
Product Jobs
Product Design Product Management
Marketing
Brand Manager Copywriting Marketing Social Media
Operations
Account Executive Project Coordinator Project Manager
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