Senior Mobile Front-End Engineer (React Native) for AI Assistant

Amazon; Bellevue (WA); On-site; USD 168,000 - 227,000; Full time

Job summary

Amazon.com Services LLC in Bellevue, WA is seeking a Senior Front-End Mobile Engineer to own the mobile experience for Aza on iOS and Android. You will ship high‑fidelity conversational and voice interfaces, partnering with designers to translate intent into shipped product.

You\'ll work across the mobile stack—from UI animations to native modules to CI/CD pipelines—and raise the bar for mobile engineering at scale. This role demands React Native expertise and collaboration across teams.

Qualifications

• 4+ years of non-internship frontend/web/mobile development with JavaScript, HTML and CSS experience.
• 5+ years of front-end developer creating prototypes or wire-frames for enterprise web applications or workflows experience.
• Experience developing with MVC/MVM frameworks (e.g. React.JS, AngularJS, Vue).
• Bachelor's degree in Computer Science or other technical degree or related experience.
• 4+ years of UI Automation (preferably on mobile platforms) experience.
• Demonstrated experience with React Native's New Architecture (Fabric, TurboModules) and leading major RN version upgrades.
• Working fluency with native mobile tooling: Xcode, CocoaPods, Gradle, code signing, and beta distribution (TestFlight / internal tracks).
• Experience writing unit and component tests for UI code (Jest, React Native Testing Library or equivalent).

Responsibilities

• Build and own the mobile experience for Aza across iOS and Android using React Native.
• Implement complex UI animations and gestures using Reanimated (UI-thread animation), gesture handling, custom navigation transitions, and spring physics.
• Build conversational UI components: streaming/token-by-token rendering, markdown rendering, autoscroll, prompt suggestions, and nested prompt menus.
• Implement voice interaction features: live audio visualizers/waveforms, mic and session state management, wake-word handling behind feature flags, and text-to-speech playback using Amazon Nova and Polly.
• Integrate real-time client features—streaming responses from Bedrock, connection recovery, and long-lived session state.
• Build and extend the shared component library and design-token system (spacing, color, typography) used across PXT AI products.
• Implement multi-brand theming at scale—supporting light/dark modes and design variations across one codebase.
• Own keyboard, safe-area, and bottom-sheet interactions: composer-to-keyboard sync on the UI thread, detents, and edge-to-edge layouts.
• Drive React Native version upgrades and adopt the New Architecture (Fabric, TurboModules) to improve performance and maintainability.
• Ensure accessibility (WCAG) in mobile: screen-reader semantics and announcements, dynamic type and font-scale capping, focus order, and touch-target sizing.
• Implement internationalization and localization across 8+ languages, including RTL and text-expansion-safe layouts.
• Build feature-flagged, incremental rollout workflows—gating, staged launches, and clean revert/re-land patterns.
• Partner closely with product designers in Figma, providing implementation insight and pushing back constructively to improve designs.
• Write unit and component tests for UI code, and contribute to CI/CD infrastructure and release pipelines using AWS CDK or equivalent.
• Practice secure client engineering: no secrets in the client, backend-proxy patterns for credentialed calls, and supply-chain hygiene in package dependencies.
• Mentor other front-end engineers through code review and knowledge-sharing, raising the quality bar for the team.

Skills

JavaScript

React Native

UI Prototyping

Unit Testing (Jest)

Secure client engineering

Education

Bachelor's degree in Computer Science or related field

Tools

Xcode

CocoaPods

Gradle

TestFlight

Jest

RN Testing Library

AWS CDK

Job description

Amazon.com Services LLC in Bellevue, WA is seeking a Senior Front-End Mobile Engineer to own the mobile experience for Aza on iOS and Android. You will ship high‑fidelity conversational and voice interfaces, partnering with designers to translate intent into shipped product.

You\'ll work across the mobile stack—from UI animations to native modules to CI/CD pipelines—and raise the bar for mobile engineering at scale. This role demands React Native expertise and collaboration across teams.