On a side note, there are a couple of categories that were deemed difficult to narrow. In this case, there were two of them, security and storage. We felt it best to stick with broad skills, such as SSL for security or SAN for storage. Also, within the networking section, it was determined to stick with application protocols, such as DNS. The remaining categories provided a much easier means to narrow the field to an exact skill. As always, we are open to feedback. Thus, if there is a better way to get more specific results for security or storage, we are all ears.
Operating Systems
RedHat Enterprise Linux
Red Hat Enterprise Linux, or RHEL, is the enterprise-grade version of Red Hat's open source Linux operating system distribution.
Database
MySQL/MariaDB
MySQL is an open-source relational database management system. MariaDB is a community-developed fork MariaDB.
Scripting language
Python
Python is a widely used, general-purpose high-level programming language.
Virtualization
VMware ESXi
VMware ESXi (formerly ESX) is an enterprise-class, type-1 hypervisor developed by VMware for deploying and serving virtual computers.
Containerization
Docker
Docker open source container software platform that packages applications in containers.
Cloud Infrastructure
Amazon Web Services
Amazon Web Services (AWS) is a subsidiary of Amazon.com that provides on-demand cloud computing platforms to individuals, companies and governments.
Automation
Puppet
Puppet is an open source systems management tool for centralizing and automating configuration management.
App Development
Java
The Java Programming Language is a general-purpose, concurrent, class-based object-oriented language.
Security
VPN
VPN, or Virtual Private Network, allows you to create a secure connection to another network over the Internet.
Version control
Git
Git is actively maintained open source project distributed version control system.
Network Protocol
HTTP
HTTP or Hypertext Transfer Protocol, is an application protocol for distributed, collaborative, and hypermedia information systems.
Storage
SAN
SAN or storage area network, is a network which provides access to consolidated, block level data storage.