About Us
Built for deep, embedded partnerships.
We work as an extension of our clients' teams, close enough to understand not only how a system works, but also the dependencies, assumptions, and accumulated decisions that shape it.
Founding team
Led by people who’ve spent decades securing consequential systems.
Jonathan Claudius
Jonathan Claudius has more than two decades of experience in cybersecurity and a strong track record of building high-performing teams. Having held roles including Chief Security Officer at Jump Crypto, Director of Security Assurance at Mozilla, and Lead Security Researcher at Trustwave SpiderLabs, his experience spans product security, incident response, vulnerability research, open-source ecosystems, and more.
Felix Wilhelm
Felix is a renowned security researcher with a proven track record and someone our clients want close to their hardest technical problems. Before co-founding AR, he worked at Google Project Zero and Jump Crypto, where his research focused on finding subtle, high-impact vulnerabilities in complex systems. His work on web3 protocols has helped clients avoid more than $5B in potential losses.
Jeff Schroeder
Jeff has extensive experience building and running infrastructure where failure is highly consequential. He worked on high-frequency trading systems at Jump Trading and Virtu, and on large-scale platforms at Ticketmaster. Throughout his career, he’s gained hands-on experience with Linux and open-source tooling, automation, validator operations, and security engineering. At AR, he applies that operator’s view to securing our clients’ most critical systems.
Our team
We’ve spent our careers working on systems where failure is expensive.
The AR team includes researchers, engineers, operators, and security experts. We come from a variety of backgrounds, but we share a strong sense of curiosity and know that the hardest problems cut across verticals. Whether responding to an incident or advising on a long-term technical decision, we stay with problems until we have a deep understanding of what is happening and why.
Team members across the Americas, Europe, Africa, and Asia
50+
Potential loss avoided through responsible disclosure
$5B+
Notes from the field
Meet a few of the AR engineers.
From real-world exploits to complex vulnerabilities, our team is committed to sharing knowledge to benefit the broader ecosystem.