Multi-OS System Admin Required

I need an experienced System Administrator who's well-versed in both Windows and macOS. My main needs revolve mainly around user management, software installation and updates, network management, troubleshooting and the added responsibility of CCTV security. Applicants should have proven expertise in handling 1-5 servers. Proficiency in both Windows and macOS is necessary, as well as a good understanding of Networking and CCTV Security systems.