Senior Software engineer, iOS (Mobile Enablement) - Mercari - Mercari, inc.

業務内容

• Design, implement, and maintain high-quality iOS features using Swift and modern iOS frameworks (UIKit/SwiftUI).
• Own end-to-end feature development from requirements and architecture to implementation, testing, and release.
• Lead architectural design for complex features; optimize performance, startup time, memory usage, and stability across devices/OS versions.
• Collaborate with ML, backend, infrastructure, product, and design teams; contribute to shared mobile platform, SDKs, and modules.
• Drive code quality via reviews, automated tests, CI/CD improvements, and documentation; mentor junior/mid-level engineers.
• Stay current with iOS trends and proactively introduce ideas to improve UX, developer experience, and efficiency.
• Take ownership of cross-team initiatives and influence technical decisions at the platform level.

技術スタック

必須スキル

• Swift, iOS development frameworks (UIKit, SwiftUI, Combine, Foundation)
• Mobile architecture patterns (MVC, MVVM, Clean Architecture, VIPER, etc.)
• Experience with large-scale mobile apps and backend API integration; asynchronous/concurrent programming
• Strong problem-solving, communication, and English (CEFR B2) proficiency

歓迎スキル（該当する場合）

• SwiftUI, async/await, modern iOS capabilities
• Performance optimization, instrumentation, mobile observability
• Open-source iOS contributions or platform-level ownership
• CI/CD for mobile, automated testing frameworks, release management
• UI/UX sensitivity and attention to detail

キャリア成長観点

• モバイルEnablementプラットフォームの影響力拡大と、数千万ユーザー規模のスケールでの設計哲学を習得できる機会。
• 複数チーム横断のプロジェクトを牽引するリーダーシップと技術決定の経験、プラットフォーム全体へ影響を与える能力を養える。
• AIDriven機能や高度なパフォーマンス最適化など先端領域の実装を通じた技術力向上とキャリアの広がり。
• チームメンターとしての成長、CI/CD・テスト自動化など開発プロセスの改善をリードする機会。