AT&T Global Public Sector is a trusted provider of secure, IP enabled, cloud-based, network solutions and professional services to the Intelligence Community. We are dedicated to recruiting, developing and empowering a diverse, high-performing workforce that is passionate about what they do, committed to our shared values and dedicated to our customers' mission.Our National Security Team supports the intelligence community, providing, operating and assuring critical voice, video and collaboration services for the full spectrum of operations.AT&T has an opening for a Server Systems Administrator to support the enterprise-wide integration, automation, and management of Linux and Windows servers and integration with disparate network system resources.Description of Job Duties/Responsibilities:Install, configure, and maintain Linux and Windows-based servers and systems, ensuring optimal performance, security, and availability.Identify servers to be virtualized, create test environments, convert servers, and maintain physical/virtual infrastructure as part of standard IT systems administration.Perform system updates, patches, DISA STIG implementations and upgrades as needed to maintain a secure and stable environment.Configure and manage WSUS/SCCM for patching and application management.Ensure the security of our systems by implementing and enforcing best practices, such as firewall configuration, intrusion detection, and access control.Monitor system performance, identify issues, and implement necessary optimizations and improvements.Develop and maintain comprehensive documentation for the Linux and Windows infrastructure, including processes, procedures, and guidelines.Troubleshoot and resolve complex technical issues related to the Linux and Windows infrastructure.Collaborate with cross-functional teams to develop and implement innovative solutions that meet business requirements.Manage users and groups, including use of a centralized directory for authentication.Monitor system and storage utilization.Provide SQL database support related to mission specific applications services including service life-cycle maintenance of databases, implementing reporting features, correcting database errors, modifying databases performing upgrades, and user training.Provide technical guidance and support to other team members as needed.Required Clearance: TS/SCI with polygraph. (#ts/sci) (#polygraph)Required Qualifications: Candidate must have a total of 12 years of applicable experience. The experience can be a combination of degree and work history. This can be a High School degree and 12 years of work history OR an Associate's and 10 years, a Bachelors' and 8 years, a Masters and 6 years or a PhD and 4 years of work history. Bachelor's degree in computer science, Information Technology, or a related field. 3 years of experience in Linux or Windows system administration, preferably in large-scale environments.Proficiency in various Linux distributions, such as Red Hat, CentOS, Ubuntu, and Debian.Strong knowledge of Linux server virtualization technologies, such as KVM, VMware, and Xen.Experience with Red Hat Enterprise Linux (RHEL 7.x 8.x 9.x) is required.Proficiency in various Windows server operating systems, such as Windows Server 2012, 2016, and 2019.Familiarity with Linux storage management, including LVM, RAID, and SAN/NAS.Experience with Linux security best practices and tools, such as SELinux, firewalls, and intrusion detection/prevention systems.Familiarity with Windows storage management, including RAID, SAN, and NAS.Experience with security best practices and tools, such as firewalls, intrusion detection, and access control.Desired Qualifications:Relevant certifications, such as RHCE, RHCSA, LFCE, MCSA or MCSE are a plus.Excellent problem-solving, communication, and interpersonal skills.Demonstrated experience managing the installation and maintenance of IT infrastructure.Experience working in an environment with rapidly changing job priorities.Ready to join our team? Apply TodayOur Server Systems Administrator-Expert earns between $79,300 - 177,809 yearly. Not to mention all the other amazing rewards that working at AT&T offers. Individual starting salary within this range may depend on geography, experience, expertise, and education/training.Joining our team comes with amazing perks and benefits:Medical/Dental/Vision coverage401(k) planTuition reimbursement programPaid Time Off and Holidays (based on date of hire, at least 23 days of vacation each year and 9 company-designated holidays)Paid Parental LeavePaid Caregiver LeaveAdditional sick leave beyond what state and local law require may be available but is unprotected Adoption ReimbursementDisability Benefits (short term and long term)Life and Accidental Death InsuranceSupplemental benefit programs: critical illness/accident hospital indemnity/group legalEmployee Assistance Programs (EAP)Extensive employee wellness programs Employee discounts up to 50% off on eligible AT&T mobility plans and accessories, AT&T internet (and fiber where available) and AT&T phone Job ID 2337380 Date posted 11/10/2023