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)
displays10
proxy10
ubuntu10
automation10
water10
1password10
imap10
http-proxy10
php10
password-manager10
python10
ansible-role10
ssh10
login-system10
signing10
Programming languages (24)
Github contributions (5)
sigio/dehydrated-transip-dns-validator
May 2016 - Dec 2019
DNS Validator hook for dehydrated (formerly letsencrypt.sh) using the TransIP API
Contributions:1 review, 14 commits, 7 PRs in 3 years 7 months
apidehydrateddns-validatorletsencryptdns
proxytunnel/proxytunnel
Nov 2001 - Sep 2022
Stealth tunneling through HTTP(S) proxies
Contributions:4 releases, 5 reviews, 194 commits in 21 years 1 month
golangproxy-servertunnelingproxyhttp-proxy
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