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, Certified Juniper JNCIS-ENT and Juniper Security JSEC.

He has worked with – and installed many open source technologies: webservers, mailserver, firewalls, dns servers, mailservers, voip servers, Juniper routers and Firewalls, Routers, Switches, Loadbalancers, IPV6, WIFI hardware, etc etc.