Sr. Front-End Engineer (React TypeScript)

Job Title Sr. Front-End Engineer (React / TypeScript)

Location Jersey City NJ (100% Onsite)

Job Summary

STAFFXPERT LLC is seeking a Sr. Front-End Engineer on behalf of our client in Jersey City NJ.

This role is responsible for leading the design and development of modern high-performance web applications using React and TypeScript. The ideal candidate will play a key role in shaping front-end architecture defining engineering standards and delivering scalable accessible and user-centric web experiences.

You will collaborate closely with Product UX Backend and Platform teams to build robust UI solutions and drive excellence in front-end engineering practices across the organization.

Key Responsibilities

• Lead the design and development of complex user-facing web applications using React and TypeScript.

• Own front-end architecture decisions including state management routing and application structure.

• Develop scalable reusable UI components leveraging existing design system foundations.

• Collaborate with Product and UX teams to translate design requirements into high-quality production-ready interfaces.

• Define and enforce front-end engineering standards including coding conventions testing practices and component architecture.

• Optimize application performance including Core Web Vitals bundle size rendering efficiency and runtime behavior.

• Implement responsive cross-browser compatible and accessible user interfaces.

• Build and support advanced UI features such as real-time updates complex forms and data-rich interfaces.

• Ensure secure front-end practices including authentication flows token handling and vulnerability prevention.

• Work closely with backend teams on REST and GraphQL API integration including pagination filtering and error handling strategies.

• Establish and maintain comprehensive testing strategies using unit integration and E2E testing tools.

• Implement observability practices including client-side logging monitoring and error tracking.

Required Qualifications

• 8 years of professional software engineering experience with a strong focus on front-end development.

• Expert-level proficiency in React including hooks component design and performance optimization.

• Strong experience with TypeScript and modern JavaScript.

• Solid understanding of front-end build tools (Vite Webpack Babel/SWC) and package managers (npm yarn or pnpm).

• Strong CSS skills including responsive design and scalable styling approaches (CSS Modules CSS-in-JS or utility frameworks).

• Deep understanding of web accessibility standards (WCAG ARIA) and best practices.

• Proven experience optimizing web performance and Core Web Vitals.

• Strong experience integrating REST and GraphQL APIs.

• Knowledge of web application security best practices (XSS CSRF prevention secure authentication patterns).

• Experience implementing testing strategies using tools such as Jest React Testing Library Playwright or Cypress.

• Familiarity with AI-assisted development tools (e.g. GitHub Copilot Claude Code) to improve productivity and code quality.

Preferred Qualifications

• Experience with SSR frameworks such as or Remix.

• Experience working with design systems Storybook or design tokens.

• Exposure to micro-frontend architecture or module federation.

• Experience with data visualization or advanced UI libraries (e.g. D3 Canvas WebGL).

• Familiarity with enterprise authentication standards such as OAuth2 or OIDC.

• Experience modernizing legacy front-end applications and improving developer experience.