Senior Mobile Developer (React Native/ Swift / Kotlin / ReactJS)

Our Company

We’re Hitachi Digital Services, a global digital solutions and transformation business. Our expertise, innovation and technology unlocks potential – from taking theme park fans on magical rides, conserving natural resources, protecting rainforests, and saving lives. We automate, modernize, optimize, and accelerate. Our people are trusted transformers, with deep engineering expertise, focused on a sustainable future for all.

Imagine the sheer breadth of talent it takes to inspire the future. We don’t expect you to ‘fit’ every requirement – your life experience, character, perspective, and passion for achieving great things in the world are equally important to us.

The Role

We are looking for a Senior Mobile Developer with strong experience in Android native development and React Native to build high-performance mobile applications for both prototype and production use cases.

Responsibilities

• Mobile Application Development
• Develop, enhance, and maintain mobile applications using:
  • Native Android (Kotlin/Java)
  • React Native (JavaScript/TypeScript)
• Build modules to acquire Android device sensor data (accelerometer, gyroscope, GPS, etc.) and process them efficiently.
• Integrate mapping solutions (Google Maps SDK, Mapbox, or similar) and visualize real-time data on the map.
• Implement cross-platform UI components and business logic in React Native to maximize code reusability across mobile projects.
• Integrate push notifications using Azure or AWS services.
• Architecture & Quality
• Apply modern architectural patterns (MVP, MVVM, Clean Architecture).
• Design reusable components and write clean, maintainable, testable code.
• Participate in code reviews and advocate for engineering best practices.
• Performance, Security, and Optimization
• Optimize sensor sampling, app performance, and battery usage.
• Ensure proper handling of device permissions, background execution, and thread management.
• Troubleshoot and debug performance bottlenecks, crashes, and UI/UX issues.
• Collaboration & Documentation
• Work with PM/BA/UIUX to refine requirements and propose technical solutions.
• Prepare and maintain technical documentation (architecture design, API usage, data flow).
• Support continuous integration and deployment workflows.

Requirements:
Education

• A Bachelor’s degree in Computer Science, Information Technology, or equivalent.

Technical Skills

• At least 3 years of experience in React Native development.
• Hands-on experience with:
  • React Native, JavaScript/ES6+, React Hooks
  • HTML/CSS/JS fundamentals
• Experience with push notification services on Azure or AWS.
• Strong experience in Native Android development:
  • Android Studio / SDK
  • Java
• At least 1 year of experience in Kotlin
• Solid understanding of:
  • Object-Oriented Programming (OOP)
  • Functional Programming
  • Design Patterns
  • MVP, MVVM, or Clean Architecture

Soft Skills

• Strong problem-solving skills and analytical thinking.
• Ability to work independently and collaborate in cross-functional teams.
• Good communication skills in English
• Having Japanese Languages is a big plus
• Willing to go onsite customer's office in HCMC  

Our Values

We strive to create an inclusive environment for all and are open to considering home working, compressed/flexible hours and flexible arrangements. Get in touch with us to explore how we might be able to accommodate your specific needs.

We are proud to say we are an equal opportunity employer and welcome all applicants for employment without attention to race, colour, religion, sex, sexual orientation, gender identity, national origin, veteran or disability status. 

About us

We’re a global, team of innovators. Together, we harness engineering excellence and passion to co-create meaningful solutions to complex challenges. We turn organizations into data-driven leaders that can make a positive impact on their industries and society. If you believe that innovation can bring a better tomorrow closer to today, this is the place for you.

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