Software Engineer - Test Automation (SDET)
Mach9
San Francisco, CA · $130k–$170k a year · Posted September 4, 2026
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Where San Francisco, CA ranks
Where San Francisco, CA placed in our monthly rankings, month by month. Each month stays online at its own address.
November 2026
- #1Best cities for security jobs316 openings · of 20
- #1Best cities for technology jobs7,178 openings · of 100
- #1Best cities for financial services pay after cost of living$173k · of 33
- #1Best cities for entry-level jobs that want AI skills35% · of 100
- #1Best cities for entry-level jobs that want AI skills in the West Coast35% · of 54
- #1Cities with the most jobs that do not need a four-year degree in the West Coast902 jobs · of 47
Rankings about engineering jobs
- Best cities for software and engineering jobs #1 San Francisco (3,412 openings)
- Best cities for engineering pay after cost of living #1 San Mateo ($216k)
- Most requested AI skills in engineering jobs #1 AI tools in daily work (6.1%)
- AI tools named most often in engineering jobs #1 Claude (1.7%)
- Employers with the most engineering jobs #1 Amazon (2,992 roles)
Pay compared with the market
This listing pays about $150,000 a year. Across 475 open software engineer listings that state pay, the middle half runs $159,500 to $238,500 and the median is $197,500. That is 24% below the median, below the middle half of those listings.
Listed pay is what employers advertise, not what people are paid.
How AI is used in this kind of work
Among software developers, AI is already used for some of the tasks. Measured exposure for software developers: 29% (some).
Share of this job’s tasks that AI is already used for at work, from real usage. It is not a forecast of job loss, and a low number means no use seen yet. Source: Anthropic Economic Index.
Skills this job asks for
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About the job
THE ROLE
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
WHAT YOU BRING
- 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
- Experience building or substantially evolving an E2E test framework: fixtures, test data, isolation, parallel execution, and flakiness control
- Experience integrating tests into CI and keeping pipelines fast and reliable
- Interest in AI-assisted development and using agents to improve software quality
- Experience with performance regression tracking
- Experience testing CAD, 3D, geospatial, mapping, high performance editor, or gaming products
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 from our office in SoMa five days a week, with flexibility when needed. Visa sponsorship is available for this role.