Senior React UI Engineer - Performance, APIs & Testing

Quantum Technologies. LLC; Plano (TX); On-site; USD 120,000 - 150,000; Full time

Job summary

Quantum Technologies LLC in Plano, TX is seeking a senior front-end engineer to build reusable, scalable React components and implement React Hooks with Redux/Context. You will integrate RESTful APIs and GraphQL services, optimize performance, and maintain strong test coverage.

Collaborating with designers, backend engineers, and product managers, you will deliver high-quality UI, debug issues, and stay current with React updates and tooling like Webpack and Enzyme.

Qualifications

• 8–10 years of hands-on experience in UI / Front-End Development.
• Advanced experience with React.js, React Hooks, Redux, Flux, and component-based architecture.
• Experience with Webpack, Enzyme, and other front-end build/testing tools.
• Familiarity with REST APIs, GraphQL, and third-party service integration.
• Awareness of front-end security practices (CSP, XSS prevention, etc.).
• Hands-on experience writing unit tests and maintaining high test coverage.
• Excellent problem-solving, communication, and collaboration skills.

Responsibilities

• Build reusable, scalable React components following best practices.
• Implement React Hooks, state management (Redux / Context API), and component lifecycle methods.
• Integrate and consume RESTful APIs and GraphQL services.
• Use React ecosystem tools such as Webpack, Enzyme, Redux, and Flux.
• Work on application performance tuning, code splitting, and rendering optimizations.
• Follow front-end security best practices to ensure secure UI development.
• Develop and maintain unit tests using Jest, React Testing Library, or similar frameworks.
• Collaborate closely with designers, backend engineers, and product managers to deliver high-quality UI .
• Debug, troubleshoot, and resolve UI /UX issues across the application.
• Stay updated with the latest React updates, patterns, and industry best practices.
• Work with version control tools like Git/GitHub for code management.

Skills

UI Front-End

React.js

React Hooks

Redux

Flux

Component-based architecture

REST APIs

GraphQL

Webpack

Enzyme

Security practices

Unit tests

Testing Library

Communication skills

Tools

Webpack

Enzyme

Job description

Quantum Technologies LLC in Plano, TX is seeking a senior front-end engineer to build reusable, scalable React components and implement React Hooks with Redux/Context. You will integrate RESTful APIs and GraphQL services, optimize performance, and maintain strong test coverage.

Collaborating with designers, backend engineers, and product managers, you will deliver high-quality UI, debug issues, and stay current with React updates and tooling like Webpack and Enzyme.