IT Consultant · Linux, BSD & Networking
Reliable infrastructure, built on open source.
I help companies plan, operate and future-proof their infrastructure — from Linux/BSD servers to IPv6 rollouts and BGP peering, all defined as code so production never drifts from its intended state.
Services
How I can help
From rock-solid Linux/BSD environments to IPv6 rollouts and BGP peering — I deliver open-source-based solutions built to stay in production.
Linux & BSD operations
Debian, Ubuntu, RedHat/Fedora, SUSE, FreeBSD and OpenBSD — from server design and hardening to daily operations and migration.
Infrastructure-as-Code & DevSecOps
Everything defined in Ansible and versioned in Git, so environments never drift from their intended state. Security built into the pipeline, not bolted on afterwards.
Networking, IPv6 & BGP
Design and rollout on Cisco and Ubiquiti (Unifi). IPv6 planning, BGP/OSPF peering, VLAN, 802.1x, DNS and DNSSEC.
Virtualization & Kubernetes
KVM, VMware and Hyper-V, plus on-prem/hybrid Kubernetes clusters spanning multiple datacenters, with Docker and CI/CD.
Security & firewalling
iptables/PF, VPN, FreeRADIUS, penetration testing and hardening — plus mail security with DKIM, SPF and DMARC.
Process automation
RPA development and process optimization with UiPath and Power Automation, from scoping to high-availability operations.
About
From one-person IT shop to infrastructure architect
I've worked with Linux, BSD and networking for over 20 years — from my first consulting work in 2000 to advising companies today on infrastructure, architecture and automation.
In recent years I've specialized in Infrastructure-as-Code and a DevSecOps mindset: everything — servers, networking, security policy — is defined in Ansible and versioned in Git. That applies both to my clients' environments and my own infrastructure at home, where nothing is changed by hand, so production can never drift from its intended state.
In 2007 I founded SemarkIT to offer independent consulting in open-source operations and networking. Since then, I've led an IPv6 rollout with my own Provider Independent range and BGP peering for a major Danish hosting provider, and built and operated Kubernetes clusters spanning multiple datacenters.
I believe in solutions that are transparent, well documented and built to last — without unnecessary complexity or vendor lock-in.
Read more →Open source & community
Open source & community
I'm an active contributor to the open-source community — from filing bugs with Debian developers to helping ship FreeBSD releases.
Debian contributions
Reported and helped fix bugs with Debian developers, particularly around virtualization.
FreeBSD
Active in the FreeBSD community and contributed to the FreeBSD release.
Forums & IRC
Long-time activity on LinuxIN.dk and IRC channels for Debian, Samba and FreeRADIUS.