At a Glance
- Tasks: Build innovative property-based testing libraries to enhance software reliability.
- Company: Join Antithesis, a cutting-edge tech company redefining software reliability.
- Benefits: Competitive salary, collaborative culture, and opportunities for professional growth.
- Other info: Dynamic team environment with diverse backgrounds and strong mentorship.
- Why this job: Make a real impact on software reliability using the latest technologies.
- Qualifications: Experience with property-based testing and proficiency in at least one programming language.
The predicted salary is between 60000 - 80000 £ per year.
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
This role, on a team based in London, is responsible for building out Hegel, our new family of property-based testing libraries. We are building open source libraries to provide top quality property-based testing in every language, both for the benefit of the community at large, and because it provides a natural on-ramp for potential customers to test their software in Antithesis.
Must have for this role
- Experience using property-based testing (PBT).
- Experience with Hypothesis would be slightly preferred but experience with any other PBT library is fine too.
- Comfortable with the idea of using AI assistance in developing Hegel, with a lot of human review and care to maintain quality.
Nice to haves
- Familiarity with at least one, ideally both, of Python and Rust.
- Willingness to work in a variety of languages.
- Expert-level in at least one language that you would be keen to be “tastemaker” for a Hegel implementation.
- Having maintained an active open source library is a strong plus.
The Tech
You can see most of the tech in question on GitHub. hegel-core is Python, and hegel-rust is our most mature client library. We also have Go, TypeScript, C++, and OCaml (some not yet public). We’re not immediately planning to support more, but if there’s some language you’d be keen to add support for feel free to let us know. We are heavy Claude Code users. Antithesis more broadly are heavy Nix users, and it would be a plus to be familiar with that, but because Hegel integrates with existing language package managers we are not actually heavy users of it on this team in particular.
The Culture
Our team is composed of people with a variety of backgrounds: standard engineering degrees to philosophy degrees; big-tech backgrounds to scrappy startups. But we have at least one common skill: everyone on the team, including managers, is held to the same high standard of engineering competency. In addition, we value in-person work for its value in building trust and sharing knowledge and mentoring each other.
Note: This is a 5 days a week in-office job in London, UK.
Senior Software Engineer employer: Antithesis
At Antithesis, we pride ourselves on being an exceptional employer that fosters a culture of innovation and collaboration. Our London-based team thrives in a dynamic environment where every voice is valued, and employees are encouraged to tackle challenging problems in software reliability. With a strong emphasis on professional growth, mentorship, and the opportunity to work on cutting-edge technology, we offer a rewarding experience for those looking to make a significant impact in the tech industry.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Software Engineer
✨Tip Number 1
Get your networking game on! Reach out to current employees at Antithesis on LinkedIn or other platforms. A friendly chat can give you insider info and maybe even a referral, which can really boost your chances.
✨Tip Number 2
Show off your skills in real-time! If you get the chance, participate in coding challenges or hackathons related to property-based testing. This not only sharpens your skills but also demonstrates your passion for the field.
✨Tip Number 3
Prepare for technical interviews by brushing up on your knowledge of Python and Rust. Make sure you can discuss your experience with property-based testing confidently, as this is key for the role at Antithesis.
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, it shows you’re genuinely interested in joining the team at Antithesis.
We think you need these skills to ace Senior Software Engineer
Some tips for your application 🫡
Show Your Passion for Software Reliability:When you're writing your application, let us see your enthusiasm for software reliability. Share any experiences or projects where you've tackled tough problems, especially in property-based testing. We love hearing about what drives you!
Tailor Your Application:Make sure to customise your application to fit the role. Highlight your experience with property-based testing and any relevant languages like Python or Rust. The more you align your skills with what we're looking for, the better!
Be Clear and Concise:Keep your application straightforward and to the point. We appreciate clarity, so avoid jargon unless it's necessary. Make it easy for us to see your qualifications and why you'd be a great fit for our team.
Apply Through Our Website:Don't forget to submit your application through our website! It helps us keep everything organised and ensures your application gets the attention it deserves. We can't wait to hear from you!
How to prepare for a job interview at Antithesis
✨Know Your PBT Inside Out
Make sure you brush up on property-based testing (PBT) concepts and libraries, especially Hypothesis if you can. Be ready to discuss your experience with PBT in detail, including any challenges you've faced and how you overcame them.
✨Show Off Your Coding Skills
Since the role involves working with Python and Rust, be prepared to demonstrate your expertise in at least one of these languages. Bring examples of your previous work or open-source contributions that showcase your coding abilities and problem-solving skills.
✨Familiarise Yourself with Their Tech Stack
Take some time to explore Antithesis's GitHub repositories, especially hegel-core and hegel-rust. Understanding their tech stack will not only help you answer technical questions but also show your genuine interest in the company’s projects.
✨Emphasise Team Collaboration
Antithesis values in-person work and team collaboration, so be ready to discuss how you’ve worked effectively in teams before. Share examples of how you’ve mentored others or contributed to a positive team culture, as this aligns with their values.
