Jobs in Tokyo, Japan

About the role

This is a hands-on, high-ownership senior role focused on building, maintaining, and architecting Appier's unified mobile growth stack. You will bridge engagement technologies with monetization and measurement solutions, ensuring high performance, cross-platform consistency, and privacy-first standards while driving AI-assisted engineering innovations. This position is open to based in Taipei, Taiwan or Tokyo, Japan.

What you'll bring

• 5+ years of software engineering experience, with 3+ years specifically building mobile SDKs or libraries for external/enterprise clients.
• Expert-level Swift (modern Swift Concurrency, async/await, actors) and/or Kotlin (Coroutines & Flow).
• Solid understanding of iOS/Android architecture, app lifecycles, background execution, and push notification systems (APNs, FCM).
• Deep expertise in mobile performance optimization (memory, battery, network efficiency) and implementing platform privacy requirements (e.g., Apple Privacy Manifests, Android Privacy Sandbox).
• Proficiency with CI/CD, automated testing, Git, and SDK versioning.
• Comfort using AI coding agents (e.g., Claude Code, Cursor, Copilot) as part of your daily workflow.
• Experience with cross-platform frameworks (Flutter or React Native) and Web technologies (JS/TypeScript, WebView bridges).
• Platform depth: iOS (SPM, app extensions, SwiftUI) or Android (Jetpack, Gradle, Play Store management).
• AdTech experience, including mobile ad SDKs, mediation platforms (AdMob, AppLovin MAX), and mobile attribution (SKAdNetwork, ATT).
• Experience in AI-augmented engineering (building MCP tools, agent skills, RAG pipelines) and on-device ML inference (Core ML, ML Kit).
• Experience mentoring engineers, setting technical standards, and managing client escalations end-to-end.