Software Engineer - 3D Graphics

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.