Mr. Leemans is certified as Solaris System Adminstrator up to Solaris 11, Certified Solaris network administrator, HP-UX System Administator, HP Technical Professional, HP Certified Instructor, Linux LPI Certified, Cisco Certified Network Professional (CCNP), Cisco Certified Data Center DCICN, Cisco Certified System Instructor (CCSI) 32987, and Certified Juniper JNCIS-ENT.

He has worked with – and installed many open source technologies: webservers, mailserver, firewalls, dns servers, mailservers, voip servers, Juniper routers (Olive), loadbalancers, IPV6, WIFI hardware, etc etc.