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Lennart Poettering, creator of systemd, has left Microsoft to co-found Amutable, a Berlin-based Linux security startup. The company aims to build determinism and verifiable integrity into Linux systems through proactive security measures rather than reactive threat detection. Led by Poettering as Chief Engineer, Christian Brauner as CTO, and Chris Kühl as CEO, the team consists of experienced open source developers from projects like the Linux kernel, Debian, Fedora, and Kubernetes. Amutable plans to develop foundational verification technologies over the coming months and will present at FOSDEM 2026.