Senior/Staff Engineer - Bombadil at Antithesis UK Limited
Antithesis UK Limited · London, UK {'postalAddress': {'addressCountry': 'United Kingdom', 'addressLocal
- Occupation group: Software & IT
- Licensed sponsor: Antithesis UK Limited
Employer on register 23 October 2026 Ad mentions sponsorship
From the advert
About Antithesis
We've been quietly reinventing how the world thinks about software reliability, and we're just getting started! At Antithesis, we start at the foundations – we run entire software systems inside a deterministic simulation and break them in every way imaginable. Every issue then comes with a perfect reproduction, so you can identify root causes fast instead of spending days trying to recreate what went wrong.
The rise of AI-generated code has made this work more urgent than ever. Agents can write code faster than any human, but speed doesn't matter much when the output is buggy, stuck in review, or slipping through undetected. The verification bottleneck is real, it's growing, and solving it is one of the most consequential problems in software right now. That's what you'd be working on.
We're well-funded and deeply technical, the kind of place where the hardest problems get the most attention and the best ideas win regardless of who has them. If you want to do work that actually moves the needle on how reliable software can be, keep reading.
About the Role
We're looking for engineers in the Senior to Staff levels to build the future of autonomous testing. No matter your particular field of experience, if you've been ambitiously building complex software and think you could be a fit; drop us a note.
In this role you will be part of the team that maintains our open-source project Bombadil (https://github.com/antithesishq/bombadil). This includes working with the specification language and verifier, Chromium automation, advanced property-based testing, frontend development, and much more.
Must have for this role:
- Proficient in Rust development
- Experience with property-based testing or fuzzing
- Comfortable with web technology (browsers, HTTP, HTML, Javascript, CSS)
Experience that would be a plus:
- Chrome Devtools Protocol, Playwright, Cypress, or Selenium
- Formal specification languages (e.g. TLA+ or some LTL)
- Implementing parsers, type…
Advert text as supplied by the employer's job board; it may be a shortened extract.
Summary
Senior/Staff Engineer - Bombadil at Antithesis UK Limited in London. Antithesis UK Limited is listed on the Home Office register of licensed sponsors (23 October 2026). Read the full job advert and apply on the employer's or job board's site. A sponsor licence means the employer is on the Home Office register. It does not mean this role is sponsored. Check with the employer. This is not immigration advice.
Read the full advert and apply
A sponsor licence means the employer is on the Home Office register. It does not mean this role is sponsored. Check with the employer. This is not immigration advice.