Android Engineer

• メルカリ Android アプリ上の広告関連機能の設計・実装・保守
• 広告枠・広告表示・計測まわりの Android クライアント実装、および広告体験の品質向上
• 要件定義から設計・実装・テスト・リリースまで、機能開発のエンドツーエンドの推進
• モジュラーアーキテクチャに沿った、保守性・拡張性の高い設計
• 広告バックエンド・ML／検索・インフラ・プロダクト・デザイン各チームとの協働
• コードレビュー・自動テスト・CI/CD 改善・ドキュメント整備を通じた品質向上

Product Engineer for designing and implementing ad-related features in Mercari Android app.

Product Engineer, Android – Ads

Product Engineer developing ad-related features for the Mercari Android app. Collaborates with cross-functional teams to enhance ad experience and quality.

• Build and ship native Android features for onboarding, accounts, cards, payments, transfers, rewards and AI-assisted user journeys.
• Turn complex financial flows into simple, fast and reliable mobile experiences.
• Work closely with product, design, backend and AI engineers to take features from idea to production.
• Own app quality across performance, crash rate, loading states, edge cases and release stability.
• Use production feedback, analytics and customer behaviour to improve what you build after launch.
• Integrate APIs, authentication, secure data handling and financial workflows with strong attention to reliability.

Android Developer building features for BJAK's AI Neobank App.

Android Developer

Android Developer building native features for BJAK's AI Neobank App. Focusing on clean user flows and fast performance in a hybrid role in Japan.

• Build and ship Android features using Kotlin.
• Create clean mobile flows for insurance, payments, claims, renewals and financial services.
• Work with product and design to simplify complex user journeys.
• Integrate backend APIs and ensure mobile flows are stable, secure and reliable.
• Improve app performance, crash rate, loading states, responsiveness and memory usage.
• Use analytics, user behaviour and production issues to improve the product.
• Build AI-assisted mobile experiences only where they genuinely improve the user journey.

Android Engineer developing BJAK's finance super app

Android Software Engineer – Finance Super App

Android Engineer for BJAK's finance super app focused on building Kotlin mobile features and improving user journeys. Work in a hybrid role based in Tokyo with a dynamic global team.

• Design, develop and ship high-quality Android applications using Kotlin.
• Build intuitive mobile experiences across insurance, payments, claims, renewals and financial services.
• Collaborate closely with product managers, designers and backend engineers to deliver seamless end-to-end user experiences.
• Integrate backend APIs while ensuring application stability, scalability and reliability.
• Optimize application performance, reducing ANRs, crashes, memory usage and battery consumption.
• Use analytics, production insights and customer feedback to continuously improve the product.
• Build AI-assisted mobile experiences where they provide meaningful value for users.
• Contribute to engineering best practices through code reviews, testing and continuous improvement.

Software Engineer creating Android applications for a fintech startup.

Software Engineer, Android

Software Engineer creating Android applications for investing, saving, and insurance at BJAK. Collaborating globally to enhance financial applications using Kotlin and modern architecture.

• Design, develop and maintain high-performance native Android applications using Kotlin.
• Build intuitive user experiences across insurance, payments, claims, renewals and financial services.
• Work closely with product managers, designers and backend engineers to deliver seamless native mobile experiences.
• Integrate backend APIs while ensuring application stability, responsiveness and scalability.
• Optimize app startup time, rendering performance, ANR rates, crash rates, memory usage and battery efficiency.
• Continuously improve code quality through testing, code reviews and engineering best practices.
• Build AI-assisted native mobile experiences where they provide genuine value for users.
• Stay up to date with the latest Android platform capabilities and recommend improvements that enhance product quality.

Native Android Engineer developing apps for financial products at BJAK

Native Android Engineer at BJAK developing applications for their financial services. Collaborating with a global team to build scalable and reliable native mobile systems.

• Develop and deliver Android features using Kotlin.
• Build intuitive mobile experiences across insurance, payments, claims, renewals and financial services.
• Work closely with product managers, designers and backend engineers to simplify complex user journeys.
• Integrate backend APIs and ensure mobile applications remain stable, reliable and performant.
• Improve app performance by reducing ANRs, crashes, memory consumption and battery usage.
• Use analytics, production insights and user feedback to continuously improve the product.
• Build AI-assisted mobile experiences where they genuinely enhance the user journey.
• Write clean, maintainable and well-tested code while contributing to code reviews and engineering best practices.

Android Developer building mobile applications for finance products at BJAK

Android Developer – Finance Super App

Android Developer developing mobile applications for BJAK's finance products. Collaborating with a global engineering team to deliver user-friendly solutions in a fully remote setting.

• Build and ship Android features using Kotlin.
• Create clean mobile flows for insurance, payments, claims, renewals and financial services.
• Work with product and design to simplify complex user journeys.
• Integrate backend APIs and ensure mobile flows are stable and reliable.
• Improve performance, crash rate, loading states, responsiveness and memory usage.
• Use analytics, user behaviour and production issues to improve the product.
• Build AI-assisted mobile experiences only where they genuinely improve the user journey.

Android Software Engineer developing mobile applications for finance at BJAK

Android Software Engineer building mobile applications for finance at BJAK. Collaborating with global teams to deliver reliable and scalable mobile systems.

Android Engineer jobs in Japan

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Product Engineer, Android – Ads

Android Developer

Android Software Engineer – Finance Super App

Software Engineer, Android

Android Engineer

Android Developer – Finance Super App

Android Software Engineer – Finance Super App