Mobile Developer (Remote)

About this role

Sage Grey Technologies Limited, a Nigerian venture studio and technology provider, is hiring a Mobile Developer specializing in React Native and Expo. The role is remote with a contract arrangement, based in Lagos according to the listing. The developer will build and maintain cross‑platform mobile apps for iOS and Android, collaborating with product managers, designers and backend engineers to ensure performance, security and reliability. Key tasks include implementing UI, integrating APIs and third‑party services, managing state, handling authentication and navigation, and deploying via Expo Application Services. The position targets candidates with strong React Native, Expo, JavaScript/TypeScript skills and experience with mobile app lifecycles, testing and collaboration in a team setting.

What you would do

• Build reusable mobile components and optimise app performance.
• Integrate RESTful APIs and third‑party services.
• Manage application state using modern state management solutions.
• Collaborate with backend developers to define and integrate APIs.
• Implement authentication flows, push notifications, deep linking and app navigation.
• Participate in code reviews and follow mobile development best practices.
• Debug and resolve issues on Android and iOS devices.
• Handle mobile app builds and deployments using Expo Application Services (EAS).
• Publish and manage apps on Google Play Store and Apple App Store.
• Convert UI/UX designs into responsive mobile interfaces and write well‑documented code.

What they are asking for

• Experience with Git and collaborative workflows.
• Familiarity with navigation libraries (React Navigation).
• Understanding of responsive design across screen sizes.
• Ability to integrate REST APIs and third‑party SDKs.
• Strong knowledge of JavaScript and TypeScript.
• Experience with local storage options (AsyncStorage, SQLite, SecureStore).
• Understanding of mobile app architecture and lifecycle.
• Experience with React Hooks and functional components.
• Must have completed NYSC.
• Hands‑on experience with Expo framework and Expo Application Services (EAS).

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