Senior JavaScript Front-End Developer

Pay Range: $45.00hr - $50.00hr Job Overview: The candidate will serve as a Senior Front-End Developer responsible for building complex 3D interactive applications using modern React, Three.js, and React Three Fiber. The role focuses on real-time performance optimization, scalable state management, and accessible user interfaces for interactive platforms. Front-End Engineering Foundations: Demonstrate deep, senior-level expertise in React (React 19 and modern React), including the render model, hooks discipline, memoization, effect timing, and performance optimization for frame-based applications. Utilize Three.js and React Three Fiber in production environments with strong command over the scene graph, geometry, materials, the useFrame render loop, and proper memory/WebGL leak management. Apply real-time performance discipline by accounting for frame budgets, profiling render loops, understanding GPU vs. CPU trade-offs, and optimizing for lower-spec target devices. Manage application state at scale using Zustand to maintain a clean, coherent architecture. Implement accessibility as a core requirement, including full keyboard navigation, focus management, ARIA standards, WCAG AA compliance, and screen-reader testing. Utilize TypeScript, Vite, and modern testing strategies that favor validating real application behavior over excessive mocking. Responsibilities: Build and own complex React Three Fiber features, including interactive 3D equipment, selection-driven action systems, real-time visual effects, and supporting UI components. Profile and tune the render loop to maintain frame rate performance on lower-end devices. Maintain coherent application state across simulation elements, equipment, event logs, and UI components using Zustand. Ensure full accessibility compliance through keyboard operation, screen-reader compatibility, and ARIA standards. Direct AI coding tools effectively by breaking down work into well-specified tasks, reviewing generated output, and writing custom logic when required. Help maintain repository structure and coding guidelines to keep codebase contributions consistent and secure. Collaborate with the 3D technical artist to integrate assets and shaders efficiently. Benefits: Our Benefits Include: Medical, Dental, and Vision Insurance 401(k) Retirement Plan Health Savings Account (HSA) Disability Insurance (Short-Term and Long-Term) Life and AD&D Insurance Paid Sick Leave (where required by applicable state or local law) Supplemental Insurance Plans Identity Theft Protection Pet Insurance Employee Wellness Programs Employee Assistance Program (EAP) Career Growth and Professional Development Opportunities Disclaimer: Benefits eligibility, accrual rates, and usage limits may vary based on employment status, length of service, and work location. Paid Sick Leave is provided in strict accordance with applicable state and municipal mandates. Cynet Systems Inc. reserves the right to modify, amend, or terminate any benefit plans at any time in accordance with applicable laws. About Cynet Systems Founded in 2010 and headquartered in the Washington, DC metro area, Cynet Systems Inc. is a leading technology staffing and workforce solutions company serving Fortune 500 companies, government agencies, and enterprise organizations across the United States and Canada. We deliver agile, scalable talent solutions across IT, engineering, life sciences, clinical, and professional staffing, powered by a high-performing recruitment engine operating across North America and Asia. As a nationally and locally certified Minority Business Enterprise (MBE), Cynet Systems is committed to helping organizations build high-performing teams while empowering professionals to grow rewarding careers. Our organization is certified to ISO 9001, ISO 14001, ISO 27001, and SOC 2 Type II standards, reflecting our commitment to quality, security, operational excellence, and customer success.