Software Engineer | AI Hacking Agents

Does the idea of building AI agents that push the limits of offensive cybersecurity gives you butterflies

Then look no further and join us here at Hadrian as a Software Engineer focusing on building AI Hacking Agents!

We are Hadrian - an offensive cybersecurity startup. We are reshaping the future of offensive cybersecurity with AI agents built by hackers. Founded in August 2021 weve secured funding and the backing of ABN AMRO Ventures and Cherry Ventures propelling us into a new era.

Our goal is to provide companies with an autonomous Threat Exposure Management platform. At Hadrian we view security through a hackers eyes because hackers understand hackers best. We continuously map the digital footprint of organisations discover risks and prioritise remediation for security teams to harden their external attack surfaces.

Located in Amsterdams buzzing Leidseplein by Londons famous Paddington Station and our most recent US HQ in the heart of New York City our diverse team from 25 countries is on a mission to shake things up in offensive security. Join us in making waves and securing over 700 businesses and be at the forefront of automated offensive security.

As a Software Engineer on Hadrians AI team you will help build and evolve our world-class AI hacker. Youll work on our agentic pentest product as well as new AI-powered capabilities that push the boundaries of what automated hacking can do.

Were looking for someone who will take ownership of projects from ideation through development release and maintenance working across everything from agent harnesses software architecture prompts and deployments. This is a role for engineers who enjoy getting close to the problem moving quickly and turning ideas into production-ready systems without unnecessary process getting in the way.

Youll also be part of the team operating these systems in the real world! Your tasks will include evaluating pentests investigating issues and continuously improving the agents based on what you learn.

If youre excited by the idea of combining strong software engineering with cutting-edge AI to build systems that can actually hack wed love to hear from you.

• Build and optimize AI hacking agents that autonomously perform offensive security tasks and power Hadrians agentic pentest product.

• Own projects end-to-end from identifying an opportunity and designing a solution to shipping operating and iterating on it in production.

• Evaluate and optimize agent performance using real-world pentest results and feedback to make our AI hackers more capable and reliable.

• Build high-quality reliable and debuggable software across LLM applications agent harnesses APIs prompts and data models.

• Respond to production issues and bugs helping ensure our AI systems remain reliable as they operate against real-world targets.

• Move quickly from idea to MVP learn from real-world feedback and iterate until you have something that works.

• Are cracked at Python and have experience owning high-reliability Python codebases.

• Have hands-on experience building with LLM APIs.

• Have 3 years of software engineering experience or equivalent experience building production software.

• Are comfortable taking end-to-end ownership of ambiguous and high-impact projects including communicating with stakeholders outside of engineering.

• Are pragmatic and biased toward action. You ship a MVP quickly learn from feedback and improve it rather than waiting for perfection.

• Are excited to work 50% in person from our Amsterdam office.

• Built AI agent harnesses or worked with agentic frameworks such as LangGraph LangChain or PydanticAI.

• Experience with TypeScript Go or C#.

• Experience with Kubernetes GCP or AWS.

• Hands-on hacking or offensive security experience.

• Contributed significantly to open-source AI projects or repositories.

• Published research or presented at conferences in AI or related fields alongside strong practical engineering experience.

• Experience building AI products at a startup or scale-up or having founded a company yourself.

• Unlimited paid holiday

• Stock options package

• Mobile phone stipend

• Work-from-home budget

• Business travel card

• Swapfiets

Make the internet safer: We enable companies to protect their customers employees and other stakeholders from malicious hackers by providing real-time Exposure Management from the Hackers perspective

Board a primed rocket ship: Hadrian is growing fast; the team is approaching 90 wonderful people notable customers are signed and significant funding is raised. Now is the time to join our high-growth journey

Be part of a strong and dynamic culture: Our values define who we are as a group and serve as the cornerstones to guide us in building a product that our customers love. At Hadrian we achieve this by championing a culture that takes ownership succeeds together increases velocity and pursues growth

Our customers are seeking a world-class and reliable digital security service. That is exactly what we are offering. Therefore a background check will be part of the process.