Hello,
I have been working with Plesk servers for more than 12 years.
I mainly used Plesk running my own small webhosting business, and occasionally helped others who had problems with Plesk.
I have experience with plesk command line toos, and also have some knowledge about Plesk internals and api.
During these years I have developed some tools to make my job easier (e.g. a python program to analyze and score SASL logins, locking out automatically hijacked accounts, and triggering Nagios alert.)
I also have two decades of linux and unix epreience with web and mail servers, databases.
Regards,
Imre Csatlós