Mobile Developer (React Native + Expo)

Mobile Developer (React Native + Expo) Job at Sage Grey Technologies Limited

Sage Grey Technologies is a Nigerian Company incorporated as a Venture Studio for technology startups and investments. A technology provider that creates impact by developing and deploying practical and sustainable solutions across various sectors.

We are recruiting to fill the position below:

Job Position: Mobile Developer (React Native + Expo)

Job Location: Lagos (Remote)

Employment Type: Contract

About the Role

• We are looking for a skilled and passionate Mobile Developer with strong experience in React Native and Expo to join our engineering team.
• The ideal candidate will be responsible for building high-quality, scalable, and user-friendly mobile applications for both iOS and Android platforms.
• You will work closely with product managers, designers, and backend engineers to deliver reliable mobile experiences while ensuring performance, security, and maintainability.

Responsibilities

• Design, develop, and maintain cross-platform mobile applications using React Native and Expo.
• Build reusable, scalable, and efficient mobile components.
• Convert UI/UX designs into responsive and pixel-perfect mobile interfaces.
• Integrate RESTful APIs and third-party services.
• Implement authentication flows, push notifications, deep linking, and app navigation.
• Manage application state using modern state management solutions.
• Optimize mobile applications for performance, speed, and reliability.
• Debug and resolve application issues across Android and iOS devices.
• Handle mobile app builds and deployments using Expo Application Services (EAS).
• Publish and manage applications on Google Play Store and Apple App Store.
• Collaborate with backend developers to define and integrate APIs.
• Write clean, maintainable, and well-documented code.
• Participate in code reviews and follow mobile development best practices.

Requirements

• Strong experience building mobile applications with React Native.
• Hands-on experience with Expo framework and Expo Application Services (EAS).
• Strong knowledge of JavaScript and TypeScript.
• Experience with React Hooks and functional components.
• Understanding of mobile application architecture and lifecycle.
• Experience with navigation libraries such as React Navigation.
• Experience with state management tools (Redux, Zustand, Context API, or similar).
• Ability to integrate REST APIs and third-party SDKs.
• Experience handling local storage solutions such as AsyncStorage, SQLite, or SecureStore.
• Understanding of mobile authentication and security best practices.
• Experience debugging applications using React Native development tools.
• Familiarity with Git and collaborative development workflows.
• Good understanding of responsive design across different screen sizes.
• Must have completed NYSC.

Nice to Have:

• Experience working with native modules.
• Knowledge of Swift or Kotlin is a plus.
• Experience with Firebase services (Authentication, Cloud Messaging, Analytics, Crashlytics).
• Experience implementing maps, geolocation, payments, camera, and media features.
• Knowledge of CI/CD pipelines for mobile applications.
• Understanding of App Store and Play Store review processes.
• Experience with performance monitoring tools such as Sentry.

Technical Stack:

Mobile:

• React Native
• Expo
• TypeScript
• JavaScript

State Management:

• Redux / Zustand / Context API

APIs & Services:

• REST APIs
• Firebase
• Push Notifications
• Third-party SDK integrations

Development Tools:

• Expo EAS Build
• Git
• App Store Connect
• Google Play Console

Soft Skills:

• Strong problem-solving skills.
• Ability to take ownership of mobile features.
• Attention to detail and user experience.
• Ability to work independently and collaborate with a team.
• Passion for building high-quality mobile products.

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