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 Title: Mobile Developer (React Native + Expo) 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.