Sr. Frontend Developer - Berkley Heights NJ (Onsite) - Contract.

Job Title : Sr. Frontend Developer

Location: Berkley Heights NJ

Job Type : Contract

• Web App: Build and maintain React/Next.js components that run reliably inside iOS and Android webviews.
• Accessibility (ADA/WCAG): Ensure product accessibility to meet ADA and WCAG 2.1 AA standards; implement semantic markup, keyboard navigation, focus management, ARIA attributes, screen-reader compatibility (VoiceOver/TalkBack), and automated/manual accessibility testing.
• Shell Scripting & AWS Deployment: Author and maintain shell scripts and CLI tooling for build, deployment, and operations (Bash/zsh). Integrate with AWS tooling and CI/CD pipelines to automate releases, rollbacks, and environment promotion.
• Cross-Platform Collaboration: Coordinate with iOS/Android engineers to maintain reliable webview bridges, intents, and native callbacks; deliver platform-specific UX while maximizing shared code.
• State & Security: Manage Redux state flows for payment/pass data, ensure secure token handling, session management, and adherence to security/PCI considerations.
• Testing & Observability: Write unit/integration tests (Jest, React Testing Library), e2e tests for wallet and widget flows, and instrument critical paths with logging/monitoring (e.g., Datadog).
• Performance & UX: Optimize webview performance for low-power tablets and network-constrained environments; implement progressive enhancement and graceful degradation.
• Code Quality & Processes: Enforce best practices with ESLint, Prettier, Husky, code reviews, and SonarQube/CI checks.

Required Skills & Experience

• Experience: 5+ years frontend engineering with strong TypeScript + React (v18+) + Next.js experience.
• State Mgmt: Deep knowledge of Redux and side-effect handling (thunks/sagas/observables).
• Wallet Expertise: Practical experience with Apple Wallet and Google Wallet/Passes or equivalent token/pass provisioning.
• Accessibility: Proven ability to deliver accessible applications compliant with WCAG 2.1 AA; experience running VoiceOver/TalkBack and accessibility audit tools.
• Shell & AWS: Proficient in shell scripting (Bash/zsh), AWS CLI, and common AWS services used in frontend delivery; experience automating deployments and troubleshooting CI/CD.
• Mobile WebView: Experience developing/debugging WebView-based apps and native-web interactions.
• Security & Compliance: Secure token handling, CORS, CSRF, secure storage patterns, and familiarity with fintech compliance basics.
• Testing & Tooling: Jest, React Testing Library, CI/CD familiarity, Docker basics, ESLint, Prettier.
• Styling & UX: Material-UI (v4/v5), Emotion/Styled Components, responsive and tablet-first design.

Nice-to-Have

• Native iOS/Android development familiarity.
• Experience generating/signing wallet passes, JWT workflows, or HSM integrations.
• Prior fintech or payments domain experience.

Technical Environment
Frontend: React 18, Next.js, TypeScript, Redux
Styling: Material-UI, Emotion/Styled Components
Testing: Jest, React Testing Library
CI/Deployment: Docker, shell scripts, AWS CLI, CI providers (GitHub Actions/Jenkins/etc.), SonarQube
Monitoring: Datadog.