* Linux (Red Hat, CentOS, OpenSuse, Ubuntu)
* Red Hat Certified System Administrator (RHCSA)
* Docker Essentials (from IBM)
* Kubernetes Essentials (from IBM)
* Sun Solaris 10 / HP-Unix
* Shell Scripting
* Cisco (CCNA, CWNA, CCNP)
* Huawei (HCNA, HCNP)
* Windows 2003/2008 Servers (MCITP)
* HP, Sun & Huawei Hardwares
* C++ / Python3 Programming Language
* Oracle Database 11g (PL/SQL)
* ITIL4 Service Operation
* AVR / ARM11 Microcontrollers