Frontend Engineer - React Native, FinTech

IO Tech Solutions Limited; Hong Kong; On-site; HKD 500,000 - 900,000; Full time

Job summary

IO Tech Solutions Limited is seeking a skilled React Native Engineer to design, build, and maintain high-performance, cross-platform mobile apps for iOS and Android. You will collaborate with product managers, UI/UX designers, and backend engineers to deliver smooth, native-feeling experiences.

The ideal candidate has 5+ years in production-ready RN apps, strong TS and state-management expertise, and hands-on experience with native build tools and release processes.

Qualifications

• 5+ years of professional software engineering experience with production-ready React Native apps.
• Deep understanding of state management tools (Redux Toolkit, Zustand, Context API).
• Experience with native build systems and IDEs like Xcode, Android Studio, Gradle.

Responsibilities

• Architect and build features, components, and user journeys using React Native and TypeScript.
• Integrate RESTful or GraphQL APIs with offline storage, caching, and sync.
• Diagnose performance bottlenecks, memory leaks, and UI rendering lag.
• Develop native modules or bridges for device hardware or platform APIs.
• Manage mobile release cycles including code signing, provisioning, and deployments via Expo, TestFlight, and Google Play.
• Write unit and integration tests using Jest or React Native Testing Library.

Skills

React Native

TypeScript

State management

Performance optimization

Tools

Xcode

Android Studio

Gradle

Job description

We are looking for a skilled React Native Engineer to design, build, and maintain high-performance, cross-platform mobile applications for iOS and Android. In this role, you will collaborate closely with product managers, UI/UX designers, and backend engineers to translate complex requirements into smooth, native-feeling user experiences. The ideal candidate is passionate about mobile performance, writes clean and testable code, and stays up-to-date with the evolving mobile ecosystem.

Key Responsibilities

• Architect and build new features, reusable components, and front-end user journeys using React Native and TypeScript.
• Integrate RESTful or GraphQL APIs, handling offline storage, caching, and seamless state synchronization.
• Diagnose and fix performance bottlenecks, memory leaks, and UI rendering lag to ensure an optimal user experience.
• Write, maintain, and debug custom native modules or bridges when interacting with device hardware or platform-specific APIs.
• Manage the mobile release cycle, managing code signing, provisioning profiles, and deployments via Expo Application Services (EAS), TestFlight, and Google Play Console.
• Write robust unit and integration tests using frameworks like Jest or React Native Testing Library to support high stability.

Job Requirements

• 5+ years of professional software engineering experience, with a heavy focus on production-ready React Native applications.
• Deep understanding of state management tools such as Redux Toolkit, Zustand, or the Context API.
• Experience utilizing native build systems and IDEs like Xcode, Android Studio, and Gradle.