I've been an MVS, OS/390, z/OS system programmer since 1993. Since I work in a relatively small site, I've become familiar with most aspects of z/OS system work including:
Installing z/OS using serverpac
Installing IBM products using CBPDO
Installing ISV software
Maintaining IBM and ISV software
Techinical support
Hardware configruation
Performance monitoring
Capacity Planning

Specialties: z/OS
SAS
REXX