Mark Janssen
SPOF at SIG-I/O automatisering
The Hague, South Holland, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolMark Janssen is a seasoned Unix/Linux engineer with 24 years of experience supporting government bodies and enterprises across the Netherlands, specializing in HP-UX, AIX, Solaris and Debian/CentOS/Ubuntu environments. He runs SIG-I/O automatisering, offering systems maintenance, monitoring and private cloud services, and has a track record modernizing production stacks with automation (Ansible), backups (borg) and mesh networking (WireGuard). Comfortable in both hands-on operations and consultancy roles, he has led monitoring and logging upgrades for large public services and trained professionals in RHCSA and Ansible. Based in The Hague, he only accepts short-term, mostly remote engagements within 30km, and prefers contractor work over employment. An active community contributor, he has chaired a local hackerspace and served on the board of the Dutch Unix/Linux user group, reflecting a long-standing commitment to knowledge sharing and tooling.
24 years of coding experience
13 years of employment as a software developer
Red Hat Certified Systems Administrator (RHEL 7), IT, Red Hat Certified Systems Administrator (RHEL 7), IT at Red HatSNIA Essentials / Foundation, SNIA Essentials / Foundation at SNIA FoundationsNCLA, Novell Certified Linux Administrator, NCLA, Novell Certified Linux Administrator at Novell Certified Linux AdministratorSCSA, SCSA at Sun Certified System Administrator, Solaris 10Bachelor, Computer Science, Bachelor, Computer Science at De Haagse Hogeschool / The Hague University of Applied SciencesLPI Level 2, LPI Level 2 at LPI - Linux Certification
English, Dutch, German
Github Skills (200)
shodan10
automation10
redis-client10
imap10
timesheet10
php10
password-manager10
python10
bash10
pop310
xadmin10
ssh10
login-system10
signing10
proxies10
Programming languages (23)
Github contributions (5)
hackeropuit/hackeropuit
Feb 2020 - Jun 2026
HackErOpUit.nl website
Contributions:40 reviews, 49 PRs, 167 pushes in 6 years 4 months
hugojekyll
sigio/ansible-role-mariadb-galera
Apr 2017 - Jan 2021
MariaDB role with galera clustering (rhel/centos/ubuntu)
Contributions:24 commits, 19 pushes, 1 branch in 3 years 9 months
centosclusteringgaleramariadbrhel
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