Senior/Staff Engineer - Bombadil
Most applications go out cold — see where you stand first. No sign-up to start.
Don't just apply. Show up ready.
Olive works from this exact posting — no sign-up to start.
At a glance
Job overview
Antithesis is hiring a Senior/Staff Engineer - Bombadil. Antithesis is seeking Senior to Staff level engineers to build the future of autonomous testing. The company is reinventing software reliability by running entire systems in a deterministic simulation to identify root causes of issues. This role involves working on their open-source project Bombadil, focusing on specification language, verifier, Chromium automation, and advanced property-based testing. The work addresses the growing verification bottleneck in software, especially with the rise of AI-generated code.
Key focus areas include Maintain the open-source project Bombadil, Work with the specification language and verifier, and Work with Chromium automation.
Important skills include Rust Development, Property-Based Testing, Fuzzing, Web Technology, Browsers, and HTTP. Preferred (not required): Engineering Quality.
Skills & qualifications
Skills
Qualifications
Full job description
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 systems, and interpreters
About Our Team
Our team spans CS degrees, philosophy, mathematics, and everything in between, or nothing formal at all. What everyone shares is a high bar for engineering quality. We work in-person because it's how we build trust and tackle hard problems together.
Location: This position is 5 days in the office in London, UK.
You've read the whole posting — now see how you match it.