| Operating Systems | Maintain | 86,683 | $107,500 |
| Linux | Maintain | 83,424 | $142,500 |
| SAP | Maintain | 30,766 | $102,500 |
| Systems Administration | Not rated | 28,181 | $117,500 |
| IT Infrastructure | Not rated | 27,975 | $122,500 |
| IT Systems | Not rated | 25,874 | $112,500 |
| Bash | Maintain | 24,631 | $142,500 |
| PowerShell | Invest | 22,258 | $127,500 |
| IT Services | Not rated | 21,933 | $107,500 |
| ITIL (Information Technology Infrastructure Library) | Maintain | 20,262 | $117,500 |
| Microsoft Windows | Not rated | 17,797 | $72,500 |
| Systems Analysis | Maintain | 17,320 | $117,500 |
| Systems Maintenance | Maintain | 15,626 | $77,500 |
| Shell | Maintain | 14,585 | $142,500 |
| System Upgrade | Maintain | 13,866 | $97,500 |
| IT Operations | Maintain | 13,550 | $122,500 |
| Windows Server | Maintain | 11,416 | $107,500 |
| Systems Configuration | Not rated | 10,299 | $112,500 |
| Computer Operations | Not rated | 10,245 | $67,500 |
| Shell script | Maintain | 9,678 | $142,500 |
| Windows 10 | Migrate | 9,410 | $52,500 |
| UNIX | Migrate | 8,559 | $137,500 |
| System Documentation | Not rated | 8,370 | $107,500 |
| Legacy System Management | Migrate | 7,619 | $157,500 |
| Systems Installation | Maintain | 7,576 | $62,500 |
| Command Line | Maintain | 7,010 | $122,500 |
| Mainframe Computing | Migrate | 6,660 | $112,500 |
| IT Infrastructure Management | Maintain | 6,637 | $152,500 |
| RTOS Development | Invest | 6,615 | $152,500 |
| Linux administration | Maintain | 5,953 | $137,500 |
| IT Service Management (ITSM) | Maintain | 5,777 | $112,500 |
| Patch Management | Maintain | 5,120 | $122,500 |
| Shared Resources | Maintain | 5,083 | $72,500 |
| MacOS | Maintain | 4,487 | $107,500 |
| IT Management | Not rated | 4,109 | $107,500 |
| RHEL | Maintain | 4,085 | $137,500 |
| Platform Management | Not rated | 4,059 | $107,500 |
| Windows Operating System | Maintain | 3,990 | $72,500 |
| Software Configuration | Maintain | 3,710 | $117,500 |
| Server Administration | Maintain | 3,628 | $112,500 |
| Linux command line | Maintain | 3,429 | $132,500 |
| Application Management | Not rated | 3,170 | $127,500 |
| Oracle ERP | Maintain | 3,015 | $127,500 |
| Red Hat Enterprise Linux | Maintain | 2,929 | $127,500 |
| Web Server | Not rated | 2,778 | $127,500 |
| Device Drivers | Maintain | 2,683 | $152,500 |
| Kernel | Not rated | 2,667 | $182,500 |
| IBM iSeries | Migrate | 2,543 | $62,500 |
| MCSE | Obsolete | 2,479 | $102,500 |
| Ubuntu | Maintain | 2,479 | $137,500 |
| System Setup | Maintain | 2,467 | $52,500 |
| Server Management | Not rated | 2,391 | $97,500 |
| Infrastructure Modernization | Not rated | 2,291 | $152,500 |
| Performance optimization | Not rated | 2,231 | $162,500 |
| Email Services | Maintain | 2,122 | $62,500 |
| System Center Configuration Manager | Migrate | 2,107 | $107,500 |
| UNIX Shell | Maintain | 2,046 | $142,500 |
| Command Line Tools | Maintain | 1,995 | $122,500 |
| JCL (Job Control Language) | Migrate | 1,987 | $127,500 |
| Microsoft Exchange Server | Maintain | 1,977 | $102,500 |
| Remote Administration | Maintain | 1,865 | $37,500 |
| IT Architecture | Not rated | 1,830 | $142,500 |
| Nginx | Maintain | 1,827 | $147,500 |
| CentOS | Migrate | 1,800 | $137,500 |
| IT Service Delivery | Maintain | 1,738 | $102,500 |
| Technical Maintenance | Maintain | 1,596 | $67,500 |
| KVM | Monitor | 1,571 | $137,500 |
| AppFolio Property Manager | Maintain | 1,501 | $47,500 |
| Systems Operation | Maintain | 1,499 | $137,500 |
| Windows Administration | Maintain | 1,439 | $117,500 |
| Application Configuration | Maintain | 1,405 | $122,500 |
| Windows Server Administration | Maintain | 1,214 | $117,500 |
| Technical Setup | Not rated | 1,152 | $92,500 |
| Server Architecture | Not rated | 1,130 | $157,500 |
| Redundancy | Not rated | 1,123 | $137,500 |
| Unix Environments | Maintain | 1,104 | $112,500 |
| Command Line Interface | Maintain | 1,070 | $122,500 |
| Driver Development | Invest | 1,069 | $167,500 |
| Hypervisor | Maintain | 1,011 | $152,500 |
| Server Configuration | Maintain | 981 | $107,500 |
| IBM AIX | Maintain | 944 | $117,500 |
| ITIL Framework | Maintain | 927 | $112,500 |
| Linux Scripting | Maintain | 925 | $92,500 |
| Oracle Solaris | Migrate | 887 | $132,500 |
| UNIX Commands | Maintain | 857 | $142,500 |
| IBM iSeries Access | Migrate | 817 | $72,500 |
| Kernel development | Invest | 802 | $207,500 |
| Windows Server 2008 | Not rated | 793 | $82,500 |
| Microsoft System Center | Maintain | 791 | $87,500 |
| QNX | Invest | 784 | $162,500 |
| Server Virtualization | Maintain | 710 | $107,500 |
| IT Documentation | Maintain | 666 | $67,500 |
| Windows Services | Monitor | 666 | $112,500 |
| Microsoft Virtual Server | Not rated | 641 | $97,500 |
| Software Installation and Configuration | Maintain | 632 | $62,500 |
| IT Automation | Invest | 627 | $137,500 |
| Debian | Maintain | 608 | $137,500 |
| System Migration | Invest | 590 | $77,500 |
| Computing Architectures | Not rated | 564 | $162,500 |
| Server Handling | Maintain | 561 | $97,500 |
| Desktop Virtualization | Invest | 537 | $127,500 |
| Microsoft Windows XP | Not rated | 522 | $62,500 |
| System Coordination | Not rated | 520 | $112,500 |
| QEMU | Maintain | 477 | $177,500 |
| Red Hat Satellite | Maintain | 468 | $92,500 |
| Infrastructure Setup | Maintain | 467 | $152,500 |
| AS/400 Systems | Migrate | 458 | $92,500 |
| UNIX Administration | Migrate | 456 | $137,500 |
| SAP Solution Manager | Migrate | 441 | $147,500 |
| Time sharing option (TSO) | Migrate | 414 | $102,500 |
| OS Management | Maintain | 387 | $122,500 |
| Operating System Concepts | Maintain | 386 | $137,500 |
| IBM Interactive System Productivity Facility (ISPF) | Maintain | 367 | $117,500 |
| Oracle Enterprise Manager | Maintain | 364 | $122,500 |
| Kaseya VSA | Maintain | 362 | $72,500 |
| Mainframe Development | Migrate | 345 | $112,500 |
| OS Installation | Migrate | 332 | $107,500 |
| SUSE | Maintain | 321 | $147,500 |
| POSIX | Maintain | 309 | $182,500 |
| Archibus | Maintain | 299 | $117,500 |
| Operating System Development | Maintain | 284 | $102,500 |
| Linux kernel development | Invest | 255 | $202,500 |
| Windows Server 2003 | Not rated | 247 | $142,500 |
| Background Services | Maintain | 243 | $152,500 |
| Email Configuration | Maintain | 231 | $72,500 |
| Infor CloudSuite | Maintain | 216 | $97,500 |
| IBM MVS | Migrate | 203 | $102,500 |
| OS Fundamentals | Not rated | 202 | $172,500 |
| Remote Operation | Maintain | 200 | $87,500 |
| Operating System Configuration | Maintain | 196 | $97,500 |
| C shell | Migrate | 191 | $157,500 |
| Virtual Memory Management | Maintain | 184 | $182,500 |
| Email Servers | Maintain | 180 | $62,500 |
| Background Processing | Maintain | 175 | $192,500 |
| Graphics Driver | Migrate | 152 | $202,500 |
| OS Configuration | Maintain | 152 | $127,500 |
| KornShell | Migrate | 140 | $117,500 |
| Remote Installation Services | Not rated | 139 | $62,500 |
| DOS shell script | Not rated | 133 | $92,500 |
| Fedora | Maintain | 133 | $152,500 |
| System Customization | Maintain | 133 | $117,500 |
| IBM Tivoli | Migrate | 130 | $122,500 |
| IBM Power Systems | Maintain | 129 | $117,500 |
| macOS Development | Maintain | 127 | $202,500 |
| Computer Systems Design | Not rated | 126 | $112,500 |
| IT Infrastructure Design | Not rated | 125 | $137,500 |
| Oracle Application Server | Migrate | 123 | $127,500 |
| Operating System Design | Maintain | 119 | $187,500 |
| Amazon Linux | Maintain | 115 | $122,500 |
| Logical partition (LPAR) | Migrate | 115 | $122,500 |
| Zsh | Not rated | 107 | $117,500 |
| Mainframe Management | Migrate | 104 | $142,500 |
| System Cleanup | Migrate | 95 | $72,500 |
| Command Line Proficiency | Maintain | 91 | $122,500 |
| Game Streaming Setup | Maintain | 88 | $172,500 |
| Daemon Processes | Maintain | 84 | $102,500 |
| Application Server Management | Not rated | 82 | $102,500 |
| Microsoft Windows Pre-installation Environment | Maintain | 81 | $82,500 |
| macOS Administration | Maintain | 80 | $92,500 |
| IBM z/OS operating | Maintain | 78 | $112,500 |
| Server Performance Monitoring | Maintain | 77 | — |
| FreeBSD | Maintain | 74 | $147,500 |
| Facilities Data Center | Invest | 72 | $122,500 |
| Terminal Access | Maintain | 70 | $72,500 |
| Operating System Management | Not rated | 68 | $142,500 |
| Web Server Management | Not rated | 67 | $127,500 |
| Plesk | Maintain | 66 | $37,500 |
| Web Server Configuration | Maintain | 65 | $122,500 |
| Command-line usage | Maintain | 63 | $82,500 |
| Windows Configuration | Maintain | 63 | $87,500 |
| IBM Domino | Migrate | 61 | $137,500 |
| DOS | Obsolete | 59 | $67,500 |
| zSeries | Maintain | 59 | $112,500 |
| UNIX Tools | Maintain | 58 | $157,500 |
| Terminal Emulation | Monitor | 57 | $127,500 |
| Customer information control system CICS | Migrate | 56 | $137,500 |
| IT Support and Administration | Not rated | 51 | $47,500 |
| VMWare Workstation | Maintain | 47 | $112,500 |
| PuTTY | Maintain | 46 | $102,500 |
| Hewlett-Packard HP OpenVMS | Migrate | 43 | $167,500 |
| IT Service Alignment | Not rated | 38 | — |
| Automated Response Systems | Invest | 35 | $102,500 |
| Postfix | Maintain | 35 | $152,500 |
| Windows Cloud-Managed Server Operations | Maintain | 35 | — |
| IBM CICS | Maintain | 32 | $147,500 |
| Middleware Configuration | Maintain | 32 | $167,500 |
| Edge Computing Fleet Management | Invest | 31 | $182,500 |
| Bourne Shell | Migrate | 30 | $217,500 |
| Email Hosting | Not rated | 29 | $82,500 |
| Hewlett Packard HP-UX | Migrate | 28 | — |
| Cygwin | Migrate | 25 | — |
| WSL | Maintain | 25 | — |
| apt | Maintain | 25 | — |
| AlmaLinux | Maintain | 22 | — |
| Microsoft Systems Management Server | Migrate | 21 | — |
| Payara Server | Migrate | 20 | — |
| Microsoft Windows Sysprep | Maintain | 18 | — |
| Puppet Enterprise | Migrate | 17 | — |
| Automated installation software | Not rated | 16 | — |
| DLL Management | Maintain | 15 | — |
| Middleware Management | Not rated | 15 | $107,500 |
| Redundancy Solutions | Invest | 14 | $147,500 |
| Synchronization Services | Maintain | 14 | $172,500 |
| MobaXterm | Maintain | 13 | — |
| CPanel | Migrate | 12 | — |
| Decommissioning Procedures | Invest | 11 | — |
| Custom Linux Distribution | Maintain | 10 | — |
| Server Based Computing | Migrate | 8 | — |
| Arch Linux | Maintain | 7 | — |
| Win CE | Migrate | 7 | $52,500 |
| Command interpreters | Maintain | 6 | — |
| Oracle iPlanet Web Server | Obsolete | 6 | — |
| Linux Container Host Hardening | Invest | 5 | — |
| Windows Media Services | Migrate | 5 | — |
| openSUSE | Monitor | 5 | — |
| System Restore | Migrate | 4 | — |
| The Administrator (LIDP) | Not rated | 4 | — |
| UA Business Software Professional Edition | Migrate | 4 | — |
| Unix System Management | Migrate | 4 | — |
| Gentoo Linux | Maintain | 3 | — |
| Platinum For Windows | Not rated | 3 | — |
| virtualBox | Monitor | 3 | — |
| JRun | Migrate | 2 | — |
| Microsoft Windows XP Professional | Not rated | 2 | — |
| OpenBSD | Maintain | 2 | — |
| Operating system shells | Not rated | 2 | — |
| Rasmussen Software Anzio | Not rated | 2 | — |
| Settings for Disabled | Not rated | 2 | — |
| CPU Tracker | Not rated | 1 | — |
| LogicalBit Eimas | Not rated | 1 | — |
| Microarchitecture simulation software | Maintain | 1 | — |
| Systemware | Not rated | 1 | — |
| Zimbra Collaboration Suite | Migrate | 1 | — |
| Clustermatic | Monitor | — | — |
| CoVirt VirtGate | Monitor | — | — |
| Computer Systems Company R4 (ACERT) | Not rated | — | — |
| Device Drivers or System Software | Maintain | — | — |
| Hoffman Computer Systems Amsoft | Obsolete | — | — |
| IBM Director | Migrate | — | — |
| IDX Groupcast | Monitor | — | — |
| IT Maintenance Scheduling | Not rated | — | — |
| Intel Graphics Drivers | Migrate | — | — |
| LAMP Administration | Migrate | — | — |
| Lynchval Systems Lvadmin | Not rated | — | — |
| Lynchval Systems Lvval | Not rated | — | — |
| Lynchval Systems Lvxact | Monitor | — | — |
| Mac OSX Administration | Maintain | — | — |
| MicroFocus GroupWise | Not rated | — | — |
| Microsoft Windows | Maintain | — | — |
| Microsoft Windows Vista Business | Not rated | — | — |
| New World Systems Logos.NET | Maintain | — | — |
| Nginx Experts | Maintain | — | — |
| OctTools | Not rated | — | — |
| Patch management | Not rated | — | — |
| RailTech Software Systems Mars for the 21st Century | Monitor | — | — |
| RegMon | Migrate | — | — |
| SimWindows | Monitor | — | — |
| Virtual Systems Mail-Shop | Migrate | — | — |
| Windows Embedded Compact | Migrate | — | — |
| ZOC Terminal | Migrate | — | — |