Front-End Engineer (React + Java Backend Integration) (Reading,PA)

Job Description We are seeking a skilled Front-End Engineer to join a team focused on enhancing and scaling an existing product in the later stages of production. This role will involve a mix of new feature development and ongoing maintenance, working within established systems rather than pure greenfield builds. The ideal candidate is comfortable navigating mature codebases and contributing to incremental product evolution beyond MVP. Key Responsibilities

• Design, develop, and maintain scalable front-end solutions using React and TypeScript
• Contribute to both net-new feature development and enhancements to existing functionality in a production environment, working in large-scale, established applications (non-greenfield environments)
• Collaborate closely with backend engineers to integrate with Java/Spring-based services
• Optimize application performance, reliability, and user experience
• Work within and contribute to design systems and reusable component architectures
• Implement and manage feature rollouts using feature flagging tools
• Participate in code reviews, debugging, and troubleshooting across the application lifecycle
• Support onboarding and knowledge transfer within a large, complex application ecosystem We are a company committed to creating diverse and inclusive environments where people can bring their full, authentic selves to work every day.

We are an equal opportunity/affirmative action employer that believes everyone matters. Qualified candidates will receive consideration for employment regardless of their race, color, ethnicity, religion, sex (including pregnancy), sexual orientation, gender identity and expression, marital status, national origin, ancestry, genetic factors, age, disability, protected veteran status, military or uniformed service member status, or any other status or characteristic protected by applicable laws, regulations, and ordinances. If you need assistance and/or a reasonable accommodation due to a disability during the application or recruiting process, please send a request to HR@insightglobal.com.

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https://insightglobal.com/workforce-privacy-policy/. Skills and Requirements

• Strong experience in modern front-end engineering with strong fundamentals in React, TypeScript, and component architecture
• React deep expertise: Hooks, context, suspense, concurrent rendering, render optimization, custom hook design
• Scalable UI architecture: Component composition, design systems, state management patterns (Redux/Zustand/TanStack Query), monorepo/module federation
• Strong TypeScript & JavaScript skills: Advanced types, generics, async patterns, type-safe API contracts
• Backend integration: REST consumption against Java/Spring services, WebSocket and SSE for real-time data, optimistic updates, retry/backoff, error boundaries
• Full-stack development experience with the ability to effectively collaborate with backend teams
• Ability to go onsite 3x a week in Reading, PA
• Angular
• Familiarity with feature flagging tools and controlled feature rollouts