**Job Description:** AT&T Global Public Sector is a trusted provider of secure, IP enabled, cloud-based, network solutions and professional services to the Federal Government. 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. The scope of this Contract requires specialized expertise in areas such as high-performance computing (HPC), automated processing systems, distributed software design, and secure hosting and networking solutions. The IT infrastructure consists of a mix of Linux, Windows, and UNIX. The environment includes a variety of network devices, server interconnections, mass storage solutions, and essential supporting infrastructure services. The services provided under this Contract support areas including HPC, infrastructure maintenance for HPC systems, networking, office automation, and the development of specialized software. AT&T has an opening for a **Principle High Performance Computing (HPC) Systems Administrator:** To support a large client-based IT enterprise installation, configuration and networking of Linux and Windows based platforms. This position requires office presence a minimum of 5 days per week and is only located in the location(s) posted. No relocation is offered. Work Performed in Ft. Meade, MD 20755. **Description of Job Duties/Responsibilities:** + Oversee servers running Red Hat, CentOS, SolarisX64, SuSe, Virtual Appliances, with direct attached and FC SAN storage. + Troubleshoot PXE and DHCP boot process. + Perform Microsoft Exchange Policy management, mailbox management, enterprise-leve, multi-site design and architecture. + Support Tier 3 Infrastructure services such as: DNS, NIS, Active Directory, Centrify, Zenoss, SiteScope, HP Openview, HP Oneview, HPSA, HPSE, SPLUNK, Sendmail, Exchange, NetQoS, Infoblox, Nagios, HP Cluster Management. + Install, configure, tune and troubleshoot multi-vendor servers running numerous COTS, open source and in-house applications. **Experience with the following:** + Servers running Red Hat, CentOS, SolarisX64, SuSe, Virtual Appliances, with direct attached and FC SAN storage. + Large SPU, memory SMP systems and clusters with many cores. + Enterprise client server configurations (Group Policy, Centrify, DNS, LDAP. + Linux Scripting (Bash, Perl etc). + Linux Logical Volume Management (LVM). + Distributed Filesystems. + Configuration Management tools. + Experience troubleshooting PXE and DHCP boot process. + Multi-vendor filesystems such as XFS, GPFS, and CXFS, EXT4, CIFS, NFSClustered Blade systems and associated interconnects (iSCSI, SAD, FC, TCP/IP, etc.). + Advanced Red Hat/CentOS and Microsoft Windows Operating System (including Group Policy management) + Microsoft Exchange policy management, mailbox management, enterprise-level multi-site design and architecture. + Enterprise Active Directory/Centrify Zone management (creation, update, RBAC). + Tier 3 Infrastructure support for services such as DNS, NIS, Active Directory, Centrify, Zenoss, SiteScope, HP Openview, HP Oneview, HPSA, HPSE, SPLUNK, Sendmail, Exchange, NetQoS, Infoblox, Nagios, HP Cluster Management. + Thin client solutions based on Virtual bridges and Centrix, VPN. + NoMachine NX Virtual Desktop management. + Experience with Enterprise Virtualization products; VMWare, vSphere, vCenter, vRealize Automation, vSAN + vSwitch, Distributed Switch, Console management. + OpenShift, Docker, Kubernetes. **Installation, configuration, tuning, troubleshooting and administration of:** + Multi-vendor servers running numerous COTS, opensource, and in-house applications to accommodate HPC Division IT support requirements. + Multi-vendor servers running Red Hat of SuSe with direct attached, FC SAN storage or SSDs. + Distributing computing tools such as ReS, LSF, and SLURM. + HPC farm systems, HPC MPP clustered systems, Front End servers of Special Purpose devices (SPDs). + IBM of HP Blade servers with FC/SAS/Network back end. + Multi-vendor filesystems such as XFS, GPFS and Lustre. + Pre-Factory testing, Factory testing, System integration and Acceptance testing during the purchase process of the HPS systems. + MDOPS. Work Performed in Ft. Meade, MD 20755. **Required Clearance:** TS/SCI with polygraph. (#ts/sci) (#polygraph) **Required Qualifications:** Candidates shall have a Bachelor’s Degree in Computer Science or related field and have fifteen (15) years of demonstrable experience in system administration and support of a large client-server based IT enterprise. OR: The individual shall have five (5) years of full time computer science work that can be substituted for the Bachelor’s Degree, and have fifteen (15) years of demonstrable experience in system administration and support of a large client-server based IT enterprise. + Accepted professional certifications include a valid Red Hat Certified System Administrator or higher, Microsoft Certified Solutions Expert certification. **Ready to join our team? Apply today!** Our Principal High Performance Computing (HPC) (SA III) (Government) earns between $108,000 - 251,700 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 coverage + 401(k) plan + Tuition reimbursement program + Paid Time Off and Holidays (based on date of hire, at least 23 days of vacation each year and 9 company-designated holidays) *Pro-rated when working less than 40 hrs/wk. + Paid Parental Leave + Paid Caregiver Leave + Additional sick leave beyond what state and local law require may be available but is unprotected · Adoption Reimbursement + Disability Benefits (short term and long term) + Life and Accidental Death Insurance + Supplemental benefit programs: critical illness/accident hospital indemnity/group legal + Employee 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 **Weekly Hours:** 40 **Time Type:** Regular **Location:** Columbia, Maryland It is the policy of AT&T to provide equal employment opportunity (EEO) to all persons regardless of age, color, national origin, citizenship status, physical or mental disability, race, religion, creed, gender, sex, sexual orientation, gender identity and/or expression, genetic information, marital status, status with regard to public assistance, veteran status, or any other characteristic protected by federal, state or local law. In addition, AT&T will provide reasonable accommodations for qualified individuals with disabilities. AT&T is a fair chance employer and does not initiate a background check until an offer is made. AT&T will consider for employment qualified applicants in a manner consistent with the requirements of federal, state and local laws We expect employees to be honest, trustworthy, and operate with integrity. Discrimination and all unlawful harassment (including sexual harassment) in employment is not tolerated. We encourage success based on our individual merits and abilities without regard to race, color, religion, national origin, gender, sexual orientation, gender identity, age, disability, marital status, citizenship status, military status, protected veteran status or employment status