Open Source / Linux / Security / Automation Architect / Engineer / Enthousiast and Tech Nerd in General

Owner / System architect

Managed Server, the name says it all. Your Linux environment is professionally managed. This can be a physical server or a VPS. Solution are build using providers like TransIP, Leaseweb, OVH, Contabo, Digital Ocean, Netcup or Hetzner. Customers pay the providers themselves. No vendor lock-in. Your environment is managed for a fixed fee per month.

Solutions are based on proven technologies:

• All servers run on Debian Linux
• Updates are installed daily or more
• Almost everything is managed by Ansible
• Hardware tokens as extra layer of security
• Your servers are monitored by Zabbix, you get access too!
• Your servers, remote backups are send to a remote location
• You get access to the documentation of your environment, full disclosure

All of this for a fixed price per month.

Owner / All-round ICT system engineer

My personal Linux and Open Source consultancy practice. Organizations can engage me as an independent infrastructure engineer to help manage, upgrade, or migrate their existing or future IT environments. With 25 years of hands-on experience, I bring deep technical expertise and practical solutions to businesses of all sizes.

I provide the following services, built entirely around Linux and Open Source technologies:

• IT Consultancy.
• Infrastructure Design and Implementation.
• Systems and Network Administration.
• Custom System Development.

Owner / System engineer

My own small webhosting company. High available solution build on Open Source. Main focus is WordPress hosting and support

• Distributed ISPConfig, web/mail/database environment.
• WordPress support.
• Mail scanning based on Proxymox Mail Gateway.
• Daily / hourly backups of mail, databases and websites.

Freelance Linux system engineer

Migration of legacy CentOS servers to AlmaLinux using Ansible.

• New AlmaLinux servers, Zabbix monitoring and backup environment.
• Set up a new Plesk hosting environment and guide migrations.
• Consultancy on new hosting solutions.

Senior System Engineer

Management of web solutions, virtualization, security and datacenter infrastructure.

• Migration from VMware to XenServer.
• Build complete high available infrastructure based on Ubuntu Linux.
• Web servers, mail servers, HA NFS, database and HAProxy clusters.
• PCI-DSS security responsibilita.y
• pfSense firewall management.
• Ansible deployments.
• Design, build and manage internal IT network infrastructure based on Ubiquiti Unify.
• Technical IT lead Microsoft 365 migration and implementation.

Freelance Linux system engineer

Temporary Linux engineering for Ubuntu LTS and Debian servers within VMware.

• Upgrades, updates, patching and consultancy.
• Support for customers with hosting solutions.

Freelance Unix administrator

Management of internet infrastructure and a mobile billing platform on SUSE Enterprise Linux.

• Environment of approximately 700 physical and virtual systems.
• Debian installation with Puppet, Proxmox, Ceph/NetApp and VMware management.
• PostgreSQL administration, server migrations and Ansible/Puppet automation.

Freelance MySQL DBA

Database conversions and production optimization.

• MySQL upgrade from 5.6 to 8 in multiple stages.
• MySQL cluster with ProxySQL load balancer.
• Conversion from MyISAM to InnoDB and performance optimizations.

Senior Linux DevOps system engineer

Management of Ubuntu Linux environments for an MSP and its customers.

• DRBD, NFS and MySQL clusters, HAProxy/IPVS load balancing.
• DNS infrastructure with PowerDNS & MySQL.
• Docker, Ansible patching, backups and migrations.

DevOps engineer

Ubuntu servers with LXC containers for an email marketing platform.

• Ansible server installations, FreeIPA and security penetration tests.
• Upgrade/migration from Ubuntu 12.04/14.04 to 16.04/18.04.

Senior Linux / Unix / Network specialist

Long-standing foundation in enterprise Unix, networking, security, hosting and datacenter management.

• Debian/Solaris systems, Postfix/Sendmail, Apache, MySQL/PostgreSQL and BIND.
• Checkpoint, pfSense, IPTables, OpenVPN, Nagios, Pandora FMS and HP OpenView.
• High-availability MySQL/PostgreSQL, DRBD, NFS, Samba, Zarafa and HA web clusters.