Karolin Varner has had a thirteen-year career in the tech industry and in science and has been a part of the chaose community even longer. She started out as a software developer in 2012 and has been in charge of the development of complex software projects from the very beginning. In 2018, she began to focus primarily on cryptography and computer security. Since the beginning of 2024, she has been working at the Max Planck Institute for Security and Privacy to devote herself to scientific research into cryptographic network protocols and research into software development methods for cryptographic applications. She is the first chairperson of Rosenpass e.V. and leads the Rosenpass project introducing post-quantum security for WireGuard. She is active in the CCC and in the feminist hacker group Haecksen in particular. She supports the Haecksen infrastructure team in running the server infrastructure with her technical experience and starte the local Hannover feminist hacker group Megahertz.