Role summary: Lead engineer on the delivery team, owning the highest-complexity screens, integrations, and engineering patterns across a production mobile application. The role requires strong hands-on expertise in React Native 0.76+, New Architecture (Fabric, TurboModules, Bridgeless), TypeScript, Hermes, Expo SDK 52, TanStack Query, Zustand, and Detox, along with native Swift/Kotlin development.
You will own key integrations including Auth0/OIDC, Apple Pay, Google Pay, APNs, FCM, Universal Links, and App Links, with experience in iOS Keychain and Android Keystore for secure token storage. Prior production experience with native-to-React Native replatforming and migration of authentication tokens, push notifications, and cached data is required.
Responsibilities.
- Deliver highest-complexity screens and integrations across three delivery waves.
- Set engineering patterns, reference implementations, and code standards for the team.
- Pair with the client's engineers on paired-programming and knowledge transfer.
- Own payment integration, Auth0 identity flow, and push notification architecture at code level.
- Lead pull request reviews.
- Contribute to Architecture Decision Records.
- Support the four self-sufficiency exercises during hypercare (deploy hotfix, onboard from KB, restore during simulated P1, extend using established patterns).
Must-have technical experience
- 8+ years mobile engineering, minimum 5 years hands-on React Native in production.
- Direct production experience with React Native 0.76+ and the New Architecture (Bridgeless, TurboModules, Fabric).
- Strong TypeScript, comfortable with strict mode.
- Hands-on with Hermes engine and Expo SDK 52 prebuild.
- Direct experience with TanStack Query and Zustand.
- Detox authorship for end-to-end mobile tests, both iOS and Android.
- Prior integration of Apple Pay and Google Pay (tokenised payment handles).
- Prior integration of Auth0 or equivalent OIDC identity in mobile.
- Prior implementation of APNs and FCM push notifications, including token migration on version upgrades.
- Universal Links and App Links deep-link routing.
Native platform expertise (required).
- Comfortable reading and writing native iOS (Swift or Objective-C) and native Android (Kotlin or Java) at the level required to author or maintain TurboModules bridging native SDKs into React Native.
- Prior experience with iOS Keychain and Android Keystore for secure token storage.
Migration and replatform experience (required).
- Direct experience on at least one mobile replatform from native to React Native, in production.
- Understanding of auth token migration, push token re-registration, cached data reconciliation on first launch after replatform.
Industry background (preferred).
- Regulated Canadian mobile experience (public sector, transportation, financial services).
- Bilingual (English and French) app delivery experience.
- WCAG 2.1 or 2.2 accessibility delivery.
