Senior JavaScript Front-End Developer

Quick Facts

• Role: Senior JavaScript Front-End Developer

• Contract length: 6 months

• Work mode: Remote

Description

You’ll build and own complex React-based interactive 3D features using React (React 19 / modern React) and React Three Fiber in production. The role emphasizes real-time performance discipline (frame budgets), scalable state management with Zustand, and first-class accessibility aligned with WCAG AA. You’ll also collaborate with a 3D technical artist and work effectively with Claude Code to deliver safe, consistent code.

Responsibilities

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

• Keep the app fast on low-end hardware by profiling and tuning the render loop and managing GPU/CPU cost while holding a frame budget

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

• Make accessibility real: full keyboard operation, focus management, ARIA, and screen-reader support as core requirements

• Direct Claude Code effectively by decomposing work into agent-sized tasks, reviewing output with a senior eye, and writing by hand when appropriate

• Help maintain repo conventions and guidance (CLAUDE.md, repository structure) to keep AI-generated code consistent and safe

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

Requirements

• Senior-level production experience with modern React (React 19), including hooks discipline, memoization, effect timing, and understanding re-renders and stale closures

• Production experience with Three.js and React Three Fiber, including scene graph expertise, geometry and materials, the useFrame render loop, and disposal/memory management to prevent WebGL leaks

• Real-time performance discipline: frame-budget thinking, profiling/render-loop tuning, and managing GPU vs CPU cost

• State management at scale using Zustand (or clearly transferable experience)

• Accessibility expertise: keyboard navigation, focus management, ARIA, and screen-reader testing meeting WCAG AA

• TypeScript fluency, Vite, and a testing discipline focused on real behavior rather than mocks

• Ability to work effectively with Claude Code by decomposing work into well-specified tasks and reviewing AI output

• Collaboration experience integrating 3D assets and shaders with a 3D technical artist

Benefits

• 6-month remote contract