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Antithesis

Senior/Staff Engineer - Bombadil

London, UK
Salary
£140K - £170K
Level
Staff
Work type
On-site · London

Not stated in the posting: visa.

Open. First seen 9 September 2026.

Apply on the company's site →

About the role

Antithesis's standard text

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.

What this role asks for

In most of Antithesis's ads

JavaScript · Rust

Named in most of its open postings, whatever the role.

51% of this description is written for the role. The rest is Antithesis's standard text, folded away below.

Read against Antithesis's other open postings on this site.

The team: Antithesis HIRES STEADILY

This role is one of 6 open in Antithesis. 1 was posted in the last 30 days and the oldest in January: a team that hires all year rather than one being built.

WHAT THE TEAM WORKS WITH, ACROSS ITS POSTINGS

Rust (6 of 6), JavaScript (4 of 6), C (3 of 6), C++ (3 of 6), TypeScript (3 of 6)

OTHER ROLES ON THIS TEAM

From the team and dates on Antithesis's own job board.

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