Senior JavaScript Front-End Developer - Angular and React.js

United States
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Job Description

Senior JavaScript Front-End Developer - Angular and React.js

Jersey City, New Jersey

Job Summary

We are building a browser-based 3D virtual science lab. Students assemble apparatus, perform experiments, and are assessed on their technique — all rendered in real time with React 19, React Three Fiber (Three.js), and Zustand, built with Vite. The simulation runs on ordinary school hardware, including low-end Chromebooks, so it has to be both convincing and fast, and its behavior has to be deterministic enough to score reliably

Key Responsibilities

  • Build and own complex React Three Fiber features: interactive 3D equipment, a selection-driven action system, real-time visual effects, and the UI around them. 

  • Keep the app fast on low-end hardware — profile and tune the render loop, manage GPU/CPU cost, and hold a frame budget on Chromebook-class devices. 

  • Keep application state coherent as it grows (simulation state, equipment state, an event log used for assessment, and UI state) using Zustand. 

  • Make accessibility real: full keyboard operation, focus management, ARIA, and screen-reader support are core requirements here, not polish. 

  • Direct Claude Code effectively — decompose work into well-specified, agent-sized tasks, review the output with a senior eye, and know when to write something by hand instead. 

  • Help maintain the conventions, CLAUDE.md guidance, and repo structure that keep AI-generated code consistent and safe. 

  • Collaborate with our 3D technical artist to integrate assets and shaders cleanly. 

Skill Requirements

  • Deep, senior-level React (React 19 / modern React): the render model, hooks discipline, memoization, effect timing, and a real feel for where re-renders and stale closures come from — which matter acutely in an app running a physics loop every frame. 

  • Three.js and React Three Fiber in production. Real command of the scene graph, geometry and materials, the useFrame render loop, and disposal / memory management (WebGL leaks are a real hazard). This is the heart of the role and the skill we weight most heavily — React experience without R3F is not a substitute. 

  • Real-time performance discipline. You think in frame budgets, know what drives GPU vs CPU cost, can profile a render loop, and habitually design for the weakest target device. 

  • State management at scale with Zustand (or clearly transferable experience), keeping a growing state model coherent rather than tangled. 

  • Accessibility as a first-class skill — keyboard navigation, focus management, ARIA, WCAG AA, screen-reader testing. For an education product this is a core requirement and a procurement gate, not an afterthought

Other Requirements
Maximum Salary (US): 
Minimum Salary (US): 
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Information at a Glance

Why HCLTech?

At HCLTech, you'll supercharge your potential. You'll find your career. And you'll find your spark. All at a place that knows that helping its customers stay on top starts by putting its people first.

HCLTech is a global technology company, home to more than 223,000 people across 60 countries, delivering industry-leading capabilities centered around digital, engineering, cloud and AI, powered by a broad portfolio of technology services and products. We work with clients across all major verticals, providing industry solutions for Financial Services, Manufacturing, Life Sciences and Healthcare, Technology and Services, Telecom and Media, Retail and CPG, and Public Services. Consolidated revenues as of 12 months ending June 2026 totaled $14.8 billion. 

 

Compensation and Benefits

A candidate’s pay within the range will depend on their skills, experience, education, and other factors permitted by law. This role may also be eligible for performance-based bonuses subject to company policies. In addition, this role is eligible for the following benefits subject to company policies: medical, dental, vision, pharmacy, life, accidental death & dismemberment, and disability insurance; employee assistance program; 401(k) retirement plan; 10 days of paid time off per year (some positions are eligible for need-based leave with no designated number of leave days per year); and 10 paid holidays per year.