Senior Front-End Developer (React, Three.js)

Quick Facts

• Remote W2 contract (6+ months)
• Role: Senior Front-End Developer (React, React Three Fiber/Three.js)
• Location preference: Hoboken, NJ profiles highly preferred (office visits as needed)

Description

Senior-level front-end engineering role focused on production-grade React 19 and React Three Fiber features for a real-time physics-loop application. You will build interactive 3D equipment experiences, selection-driven action systems, real-time visual effects, and the UI around them—while keeping performance tight and accessibility compliant.

Responsibilities

• Build and own complex React Three Fiber features (interactive 3D equipment, selection-driven action system, real-time visual effects, and UI)
• Keep the app fast on low-end hardware by profiling and tuning the render loop with frame budgets
• Maintain coherent state as the system grows (simulation state, equipment state, event log for assessment, UI state) using Zustand
• Implement accessibility as a core requirement: full keyboard operation, focus management, ARIA, and screen-reader support
• Use Claude Code effectively by decomposing work into agent-sized tasks and reviewing outputs
• Help maintain conventions (CLAUDE.md) and repository structure for safe, consistent AI-generated code
• Collaborate with a 3D technical artist to integrate assets and shaders cleanly

Requirements

• Deep, senior-level React (React 19 / modern React) understanding: render model, hooks discipline, effect timing, stale closures, and re-render behavior
• Production command of Three.js and React Three Fiber: scene graph, geometry and materials, useFrame render loop, and disposal/memory management
• Real-time performance discipline: frame budgets and profiling knowledge for GPU vs CPU cost
• Scalable state management experience with Zustand (or clearly transferable experience)
• Accessibility as a first-class skill: keyboard navigation, focus management, ARIA, WCAG AA, and screen-reader testing
• TypeScript fluency and modern tooling (Vite) with real testing discipline (favor testing real behavior over mocks)
• Ability to decompose work effectively for AI-assisted coding and decide when to code by hand

Benefits

• Remote W2 contract; 6+ month duration
• Opportunity to build high-performance, accessibility-first interactive 3D education experiences in React Three Fiber