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.