I'm Hagen Paul Pfeifer, Chief Software Strategist based in Munich. I advise large engineering organizations on technology direction, architecture, and engineering practice: consulting, not managing, grounded in how systems actually behave, down to the instruction level. In practice that means guiding the adoption of new technologies and large-scale modernization, and turning strategy into concrete architectures, tooling and development practices.

The technical basis comes from decades of hands-on work. I've contributed to IETF standards on TCP, IPv6 and BGPv4, small pieces that helped shape today's Internet. Upstream, I've worked across the Linux kernel: networking, tracing, perf, epoll and the KVM hypervisor. I've also contributed to tcpdump, gcc, iproute2, libpcap, ns-2 and several other open source projects.

I wrote Linux-Systemanalyse, a systematic guide to analyzing modern Linux systems (in German). I write for Heise Medien, give talks at conferences like FOSDEM, IETF meetings, BSides and Heise DevSec, and I'm a member of the ACM and the German Informatics Society (GI).