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About the role
- Senior iOS Engineer responsible for building high-quality features at Mercari. Collaborating with teams across mobile, machine learning, and backend to enhance user experience.
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.
Requirements
- 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.
- 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.
Job title
Job type
Experience level
Salary
Not specified
Degree requirement
Tech skills
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