Mobile Engineer

Job Title:

Location:

Experience Level:

About the Role:

Senior React Native Engineer

Key Responsibilities:

• Develop and maintain

  React Native applications

  for iOS and Android.
• Collaborate with product, design, and backend teams to build new features and improvements.
• Write

  clean, modular, and testable code

  using TypeScript.
• Optimize mobile apps for

  performance, scalability, and usability

  .
• Integrate

  RESTful APIs

  and third-party libraries.
• Conduct code reviews and uphold best practices.
• Debug, troubleshoot, and resolve app performance and crash issues.

Required Skill Set:

• 5+ years

  of professional software development experience (with

  3+ years in React Native

  ).
• Strong proficiency in

  TypeScript & modern JavaScript (ES6+)

  .
• Experience with

  React.js / Next.js

  .
• Solid understanding of

  mobile app architecture, performance tuning, and SDK integration

  .
• Hands-on with

  testing frameworks

  (Jest, Detox, RN Testing Library).
• Proven experience

  publishing apps

  to the App Store and Google Play.
• Familiarity with

  Firebase, analytics SDKs, Git workflows

  .
• Understanding of

  algorithms (sorting, searching) and performance characteristics

  .
• Experience with

  monitoring & crash reporting tools

  (Sentry, Bugsnag, Datadog).
• Agile/Scrum development background.
• Fluency in

  English (business level)

  .

Good to Have:

• Experience working in a

  CI/CD environment

  .
• Contributions to

  open-source projects / tech blogs

  .
• Conversational fluency in

  Japanese

  .