For the data center:

• Systems Programming – z/OS, z/VM, z/Linux, z/VSE, Comm Server (VTAM, TCP/IP), CICS, MQ, Db2, IMS.
• Program Product Support – SMP/E maintenance/installs, product upgrades/migrations, exit coding.
• Storage Administration – DFSMS, DFSMShsm, DFSMSdss, DFSMSrmm, ACS routines, data replication/mirroring, GDPS, Disaster Recovery, etc.
• Networking – TCP/IP, VTAM, TLS, FTP, Enterprise Extender, zERT, SMC, etc.
• Security Administration – RACF, ACF2, TSS, etc.
• Troubleshooting – Dump analysis (IPCS, Abend-AID, etc.), traces (GTF), system monitors (Omegamon, TMON, MainView).
• Capacity Planning/Performance Tuning – WLM, source data extraction and analysis (SMF, RMF, log files), creation of charts and reports.
• Mainframe Automation – REXX, OPS/MVS, SA z/OS.
• Hardware Configuration – HMC, HCD, CPU upgrades, datacenter migrations.
• Systems-level Database Administration – Db2, IMS.

For the vendor:

• Commercial Product Development – HLASM, Java, C/C++/C#, PL/X, REXX, etc.
• L1/L2/L3 Support – Troubleshooting (IPCS, XDC, etc.), SMP/E packaging, coding fixes.
• Pre/Post Sales Engineering – Technical marketing, presentations, on-site product support.
• Quality Assurance – Regression testing, automation scripting, root cause analysis.