APX Security builds autonomous AI agents that perform offensive security testing the way an attacker would — probing APIs, crawling web applications, reversing mobile binaries and mapping networks. Rather than emitting scanner alerts, its agents chain findings into a working exploit and deliver reproducible proof that the vulnerability is real. The company ships two products: Cipher, a managed assessment of internet-facing applications, and Niro, continuous self-managed pentesting wired into the software development lifecycle. It was founded by Gaurav Singhal, who previously led security tooling across engineering teams at AWS.