Senior 3D Engineer

Role Overview

You will build the 3D heart of Moon's platform - real-time 3D in React Three Fiber and Three.js that homeowners experience in their own homes. This is a role for an engineer who loves both the craft of real-time 3D and the discipline of building for other engineers: new capabilities shipped as clean abstractions, and performance treated as a feature with a number on it.

About the role

•   You will join a small, senior team with a mandate to build boldly. The 3D experience is used by designers selling in customers' homes - it runs on tablets, in the field, in front of homeowners - so everything you build is measured in frames, megabytes, and seconds to first render. You will own hard, high-leverage optimization problems whose specifics we share during the interview process.

What you'll do

•   Develop new 3D capabilities that serve multiple product teams - exposed as clean, versioned, documented APIs rather than one-off features.

•   Own render and runtime performance on real devices: frame rates, load times, and memory budgets on tablets in customers' homes - profile, fix, and hold the budgets.

•   Own the optimization of our core 3D data formats and structures - significant size reduction is a priority, and you will design the formats, pipelines, and loading strategies that get us there (specifics shared under NDA).

•   Do deep scene-graph work: materials, geometry, lighting, instancing, and data-driven scene assembly.

•   Write the documentation and examples that make your work consumable without meetings; support consuming teams on a light rotation.

•   Ship daily behind flags with AI-assisted workflows on a shared design system.

Qualifications

•   5+ years of front-end/graphics engineering with production Three.js or React Three Fiber.

•   Strong 3D fundamentals: scene graphs, materials, lighting, geometry, GPU performance - and the linear algebra beneath them.

•   Real experience optimizing data formats, asset pipelines, or file sizes (compression, binary formats, lazy loading, LODs) - you can tell a before/after story with numbers.

•   Profiling depth across GPU, CPU, and memory; you find the actual bottleneck, not the assumed one.

•   Experience building libraries or SDKs consumed by other teams a strong plus.

•   Pragmatic, detail-oriented, and fast-moving.