Lead React Native Engineer - Canada

Role summary. Lead engineer on the delivery team. Owns the highest-complexity screens and integrations.

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.