Mach9 Software Engineer - Test Automation (SDET) at Mach9 will own automated test suites and test infrastructure for a browser-based 3D CAD platform. The role focuses on ensuring fast, reliable test coverage from data upload to deliverable export.
Responsibilities
At Mach9, Test Automation Engineers protect the workflows that civil engineers and surveyors rely on when they work in our browser-based 3D CAD platform. Coding agents do a growing share of our development work, but that only works when we have automated checks that return fast, trustworthy answers. You'll own the accuracy of those answers — giving us coverage that spans from data upload to deliverable export — and the test infrastructure it runs on.
This role is ideal for engineers who have built and maintained automated test suites for production web applications and can chase a failure through app code and infrastructure all the way to its root cause.
Working closely with our platform engineers, you'll help us ship confidently while shipping quickly. Success in this role will mean that our regressions will be caught by tests rather than by customers, and our engineers and agents will move faster because they'll know that your tests tell them immediately when they break something.
Where you will make an impact
Grow automated coverage across our CAD editor and drive pages
Evolve our test infrastructure and CI so our test suite stays fast and reliable as its coverage grows
Build tools for coding agents to reproduce the failures and artifacts that they need to diagnose regressions and verify fixes
Root out flaky tests so a failing build always means there's a real bug
Make our 3D editor more testable so we can automatically test our users' CAD workflows
Help other engineers write testable code and durable tests to go with every feature
3+ years building and maintaining automated test suites for production web applications with Playwright, Cypress, WebdriverIO, or similar
Proficiency in TypeScript or JavaScript, and comfort reading and changing application code
Qualification
Proficiency in TypeScript or JavaScriptInterest in AI-assisted developmentExperience testing CAD
Required
3+ years building and maintaining automated test suites for production web applications
Proficiency in TypeScript or JavaScript
Experience building or evolving E2E test frameworks
Experience integrating tests into CI and maintaining pipeline reliability
Preferred
Interest in AI-assisted development
Experience testing CAD, 3D, geospatial, mapping, high performance editor, or gaming products
