Software Engineer - 3D Graphics

Mach9; San Francisco (CA); Hybrid; USD 110,000 - 170,000; Full time

Job summary

Mach9 in San Francisco is building a browser-based 3D engine that renders tens of millions of points for LiDAR-derived CAD deliverables. This role is ideal for an early-career engineer with a strong math foundation who wants real production work, not a demo.

You will own meaningful rendering challenges, extend the point-cloud renderer, optimize for large datasets, and ship robust tools. We value practical, reliable solutions and expect you to research, test, and iterate on hard problems with

Qualifications

• Strong foundation in 3D math and spatial reasoning.
• Experience building software through coursework, projects or work.
• Ability to read and modify code you did not write.
• Attention to correctness and performance.
• Willingness to investigate problems and ship solutions.
• Experience with TypeScript and browser graphics or similar graphics code.

Responsibilities

• Build 3D tools for inspecting point clouds and creating precise drawings.
• Extend point-cloud renderer and GPU picking system.
• Solve geometry issues behind clipping, snapping, and camera controls.
• Find and fix performance problems on large datasets.
• Improve shared rendering and interaction systems for CAD tools.

Skills

3D math

TypeScript

Browser graphics

Code reading

Problem solving

initiative

Tools

WebGL

GLSL

Three.js

Cesium

Job description

The role

At Mach9, Digital Surveyor turns massive LiDAR datasets into precise CAD deliverables, automating work that currently takes surveyors and engineers weeks. Making that possible in a browser requires a 3D engine that can render tens of millions of points while supporting CAD-grade picking, clipping, snapping, and measurement. You'll work directly on that engine and the tools built on it.

This role is ideal for an early-career engineer with a strong foundation in 3D math who wants to work on a real production renderer, not a demo.

You'll do well here if you enjoy digging into difficult technical problems and building software that stays fast and reliable on large, messy real-world datasets. When the right approach isn't obvious, you'll research how others have solved similar problems, test your assumptions, and choose a practical solution. Our engineers are trusted to own their work and drive meaningful outcomes.

Where you will make an impact

• Build 3D tools that surveyors use to inspect point clouds and create precise engineering drawings

• Extend our point-cloud renderer and GPU picking system

• Solve geometry problems behind clipping, snapping, construction planes, and camera controls

• Find and fix performance problems that appear with large real-world datasets

• Improve the shared rendering and interaction systems behind our CAD tools

What you bring

• A strong foundation in 3D math and spatial reasoning, including transforms, planes, and projections

• Experience building software through coursework, personal projects, internships, or full-time work

• The ability to read and change code you did not write

• Attention to correctness and performance

• Sound judgment about when to refine a solution and when to ship it

• Experience with TypeScript and browser graphics, or comparable experience writing performance-sensitive graphics code in a statically typed language

• The initiative to investigate problems, ask useful questions, and finish what you start

Bonus experience

• WebGL, GLSL, Three.js, Cesium, or another real-time graphics system

• Point clouds, geospatial data, or large-coordinate rendering

• Experience applying geometry, spatial algorithms, or numerical methods to open-ended problems with noisy data and real-world tradeoffs

• CAD, mapping, visualization, robotics, or game-engine projects

About Mach9

Mach9 is transforming civil infrastructure design with AI-powered geospatial tools. Our platform accelerates the creation of engineering deliverables from raw data, cutting manual drafting time by 96×. Trusted by global leaders in engineering and construction, we're backed by Y Combinator, Quiet Capital, and top founders and executives from Cruise, Autodesk, Adobe, and DoorDash.

We believe the needs of a startup benefit from an in-person culture. The team works out of our office in SoMa, with the flexibility to work from home when needed.