Location: Remote (Working Hours: CST Time Zone) Type: Long-term Contract Start Date: ASAP Client Domain: Smart Devices  Sphere is looking for  Senior Frontend Developer to join a forward-thinking client developing smart device solutions.   Candidates must be available to collaborate during CST working hours. Responsibilities Develop application using Angular (must-have) and React Write scalable, well-tested TypeScript and JavaScript code Implement responsive design, smooth UI interactions, and dynamic components Collaborate closely with cross-functional teams to translate product vision into high-quality software Work with backend teams to integrate APIs and ensure seamless user experiences Maintain design consistency by contributing to shared UI libraries and component systems Review code, mentor teammates, and champion frontend best practices Requirements 5+ years of experience in frontend development with a strong focus on Angular Experience with React and an understanding of component-based architecture Experience with TypeScript, JavaScript (ES6+), HTML5, and CSS3 Experience building responsive, mobile-friendly user interfaces Strong API integration experience (RESTful services) Familiar with Git workflows, Agile methodologies, and modern frontend tooling (Webpack, ESLint, etc.) Comfortable working remotely and aligned with CST time zone Nice to Have Background working with IoT, smart devices, or connected hardware platforms Experience with Mendix/OutSystems