Hybrid Senior Software Engineer, iOS – Mobile Enablement

Posted 14 hours ago

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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

Senior Software Engineer, iOS – Mobile Enablement

Job type

Experience level

Senior

Salary

Not specified

Degree requirement

Bachelor's Degree

Tech skills

Location requirements

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