Full stack IT expert

Hi

We are small company that develop and market applications around voice processing. Our application involves strong servers over the cloud and web and mobile clients.
We are looking for free lancer to maintain and support the company's IT in the company's office and of its server over the cloud.

Here is list of subjects involved in our IT systems:
AWS
QA
DB - SQL server, Mongo DB
SSL certificate installation
Word Press
Google apps
Apple store
Vmware
Dropbox
Linux
GitHub
IP-telephony
Microsoft accounts
Fortigate
FTP
ESET anti-virus
Printer installation
Android
iOS

We are looking for long term contact that can include minimal monthly retainer.