Overview

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).
- Solid 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.

Candidates must be based in Canada. Pay: $40.00-$90.00 per hour

Expected hours: 40.0 per week

Work Location: Hybrid remote in Greater Toronto Area, ON

📌 Lead React Native Developer (Greater Toronto Area)
🏢 Zazz
📍 Greater Toronto Area