Senior Software engineer, iOS (Mobile Enablement)

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.

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.

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

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.

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.