These are my area of expertise :
1) Windows servers configuration and administration.
2) Linux servers configuration and administration.
3) Web Hosting Server Migrations or Transfers.
4) Troubleshooting issues such as Email (Authentication/Validation, Blacklists, Bounces etc.), apache/nginx/tomcat/IIS, , DNS, MySQL/MariaDB, MSSQL, PHP etc.
5) Installing and configuring Mail (hMailServer, SmarterMail, Exim, Postfix, iRedMail etc.) and DNS Servers (BIND, MS DNS).
7) Server Security Audits.
8) PHP Hardening.
9) Web Hosting Control Panel installations such as WebsitePanel/SolidCP/MSCPControl, WHM, zPanel/Sentora, Plesk Onyx, Webmin/Virtualmin, VestaCP, CWP etc.
10) Scripts installations (WordPress, Joomla, Moodle, PrestaShop, Magento, Drupal etc.) and transfers.
11) Wordpress security and migrations.
12) Administering Cloud Environment like AWS EC2, Azure.
13) Office365 Mail Domains setup and Azure Administration.
14) SSL installations and tweaking.
15) WHMCS Setup and Integration