Senior Android Engineer

Job Description

Appealing Points:

• Lead enterprise-wide change management initiatives for Google Workspace transformation projects, driving successful adoption across organizations
• Build expertise in stakeholder engagement, user training, risk mitigation, and continuous improvement within large-scale digital change programs
• Play a high-impact role in supporting employees through transformation while ensuring strong business alignment and long-term adoption success

Annual salary :5 Million yen and above

Job Responsibilities:

• Architect & implement complex, modular Android apps using Kotlin/Java and modern patterns (MVVM, Clean Architecture, Redux).
• Define and collaborate on backend service contracts (REST) and data schemas to meet mobile requirements.
• Lead the design of scalable, event-driven, microservices-oriented backends that integrate seamlessly with clients.
• Own app performance: use Android Profiler, Systrace, LeakCanary, MAT and custom instrumentation to identify and fix CPU, memory, GPU and network bottlenecks. observability (Crashlytics, Firebase ...).
• Develop and enforce coding standards, code review processes and automated quality checks (Lint, SonarQube ...).
• Build and maintain CI/CD pipelines (GitHub Actions ... ) for automated builds, tests and deployments.
• Mentor and guide mid-level engineers on best practices for test-driven development (JUnit, Espresso, Mockito) and
• Troubleshoot complex production issues, perform root-cause analysis and drive continuous improvement.
• Collaborate across distributed teams, contribute to technical documentation, design reviews and architectural roadmaps

Job Qualifications:

• 8+ years of professional Android development experience (Kotlin & Java)
• Deep understanding of Android framework internals, application lifecycle, threading and memory management
• Proven track record delivering large-scale consumer or enterprise apps (100K+ daily active users)
• Expertise in debugging and profiling tools: Android Studio Profiler, Systrace, Allocation Tracker, LeakCanary, MAT
• Strong background in RESTful/GraphQL API integration and offline data persistence (Room, SQLite, Realm) (Dagger/Hilt, Koin) deployments (AWS, GCP, Azure)
• Solid grasp of modern architecture patterns (Clean Architecture, MVVM, Redux) and dependency injection
• Experience designing or collaborating on backend services, message queues (Kafka, RabbitMQ), and cloud
• Hands-on with building CI/CD pipelines and containerization (Docker)
• Excellent communication skills, ability to influence technical direction and simplify complex problems

Preferred Qualifications:

• Prior experience as a technical lead or architect in a fast-paced Agile/Scrum environment
• Familiarity with Kotlin Multiplatform, Jetpack Compose and cross-platform frameworks (Flutter, React Native)
• Knowledge of mobile security best practices (OAuth2, JWT, certificate pinning, encryption)
• Experience with A/B testing frameworks, feature flags (Firebase Remote Config)
• Contributions to open-source Android libraries or technical blogs/presentations

Languages Required: Elementary level Japanese and business level English

Company Description:

We are a strategic digital transformation company helping businesses evolve through cloud-native technologies.

As a leading AWS Advanced Consulting Partner with 18 years of deep expertise, commitment to digital innovation, service excellence, and customer success, we understand what it takes to make our clients’ cloud migration and modernization business goals a reality with the most advanced technologies and services the cloud has to offer.

Working strategically, we enable enterprises to unlock new business capabilities, rapidly scale, and accelerate growth on the cloud. To further eliminate the repetitive, time-consuming, and labor-intensive work for every cloud-native solution, we leverage our accelerator, ARC - a true differentiator in the industry.