ManTech seeks an experienced and passionate, career and customer-oriented System Administrator to join our team located in the San Antonio, TX area. Responsibilities include, but are not limited to: Demonstrate experience creating and managing virtual environments (VMWare ESX, VCenter Administration) Experience in administration of LinuxExperience configuring and maintaining storage and file systems (NFS, EXT3/4, XFS) Experience in developing and delivering briefings, technical presentations,