System One Holdings, LLC is hiring: Senior React Developer in Greenwood Village

Senior React Developer

This role is located at the client site in Denver, CO area (Centennial, CO). Also, requires onsite presence Tuesday through Thursday each week. This is a hands-on consulting role focused on designing and delivering high-quality, scalable, and performant front-end solutions using React and TypeScript. The ideal candidate brings deep front-end engineering expertise, strong architectural instincts, and the ability to collaborate closely with UX, backend engineering, and cross-functional stakeholders to deliver enterprise-grade digital applications.
How You'll Make An Impact

• Design and implement modular, high-quality front-end features using React and TypeScript • Establish and maintain scalable front-end architecture supporting long-term maintainability and growth • Develop reusable Node.js modules and shared libraries to drive cross-project consistency • Build intuitive, accessible user interfaces leveraging Material UI or comparable design systems • Integrate applications with RESTful and/or GraphQL APIs, optimizing data access and state management • Implement comprehensive UI testing strategies using Jest, Cypress, React Testing Library, or similar tools • Optimize build performance and bundle efficiency through modern tooling such as Webpack and related technologies • Ensure solutions meet enterprise standards for performance, accessibility, and security • Partner with backend engineers to define API contracts and improve data-fetching strategies • Troubleshoot complex UI, caching, and state management challenges • Contribute to technical design discussions, conduct code reviews, and mentor junior developers • Stay current with evolving front-end trends, frameworks, and best practices
Angular
Front End Development
Front-end Architecture
Required qualifications to be successful in this role
What You'll Bring

• 10+ years of front-end engineering experience, including significant production experience with React • Deep proficiency in TypeScript with strong understanding of scalable typing patterns and coding standards • Experience implementing enterprise UI design systems such as Material UI or similar frameworks • Working knowledge of Node.js, including development of shared packages or internal libraries • Hands-on experience implementing automated front-end testing strategies • Strong understanding of modern build tooling, module bundling, tree shaking, and performance optimization techniques • Experience with state management libraries such as Redux, Zustand, Recoil, or similar tools • Proven ability to improve application performance through lazy loading, code splitting, and bundle optimization • Experience integrating RESTful services and/or GraphQL APIs with efficient data handling strategies • Familiarity with CI/CD pipelines and release management practices for front-end deployments • Strong analytical and troubleshooting skills in complex client-side environments • Effective communication skills and ability to collaborate across product, design, backend engineering, and business teams Strongly Preferred • Experience with AEM Cloud and SPA Editor • Familiarity with server-side rendering frameworks such as Next.js • Experience working within micro-frontend or modular front-end architectures • Knowledge of accessibility standards (WCAG) and advanced front-end performance optimization techniques • Prior consulting or client-facing experience