THE ROLE: At Mach9, Frontend Engineers build the connective tissue of our product: the surfaces that turn our powerful CAD engine into a whole product that civil engineers and surveyors can live in every day. You’ll partner with our design and product teams to shape how users bring in massive datasets, organize thousands of files, and run their teams. You’ll craft the experience that makes serious technical tooling feel effortless. This role is perfect for frontend engineers with strong design instincts who love building reusable UI components, and who care about the small details that can make complex software feel responsive and simple. You'll set the bar for quality across a fast-growing surface area, from our onboarding flow to our drive page to the component library behind our editor. You’ll build the foundation to let every other team ship faster as we transform how the world designs critical infrastructure. WHERE YOU WILL MAKE AN IMPACT: - Own our drive and project user experience: file organization and hierarchies, permissions and sharing, usage dashboards, and searching across thousands of files - Build the onboarding, account, settings, billing, and team-management surfaces that keep our customer organizations running - Build the ingest flows that get geospatial data into Mach9’s product - Create the notification system and collaboration surfaces that let teams work together - Develop and maintain the UI component library behind our editor, raising quality and consistency even as our surface area grows - Translate designs into pixel-accurate React UIs in close partnership with our designers, so that we can keep our data-dense interfaces fast under real-world load WHAT YOU BRING: - 3+ years building production-grade web applications - Strong proficiency in React, Next.js, TypeScript, and Tailwind - Experience building and maintaining a design system or a shared component library - A strong eye for detail and visual clarity - A product mindset and comfort working in a fast-moving, collaborative environment BONUS EXPERIENCE: - Org or file-management UIs (hierarchies, permissions, large lists) - Prior work on design tools or other creative/editing software - Experience with Storybook - Experience building LLM-powered or agentic interfaces 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.