Senior Systems Administrator

Job Description: Senior Systems Administrator

GDIT has an immediate opening for a Systems Administrator to fill a Core Services position supporting the NNSA (National Nuclear Security Administration). The Systems Administrator is responsible for supporting core service functions covering Server, Storage End Point Security (ESS), E-discovery, Microsoft Endpoint Configuration Manager (MECM), Monitoring Tools, Storage, and VMware teams.

• Enterprise Authorization:
  Integrate Linux Systems into a primary Windows environment (workstations & servers) where authentication, authorization, and accounting actives are controlled by Active Directory with PKI certificates and Single Sign-On.
• Enterprise Provisioning:
  Configure new Linux and Windows systems for customer use and ensuring that initial configurations meet the required enterprise baselines & controls (e.g., proper agents installed, proper configs, etc.).
• Integrate Linux and Windows systems with other enterprise tooling (e.g., ACAS, Splunk, Solar Winds, Backup systems, etc.).
• Ensure patches are maintained across a diverse Linux environment in a heavily automated manner, where possible.
• Ensure that already-provisioned Servers are kept in compliance with baseline requirements & ever-changing enterprise policy (e.g., equivalent to Group Policy in the Windows realm for ongoing compliance update).
• Provide technical support to the administration of enterprise Storage systems including Hyperflex, NAS and SAN platforms.
• Provide technical and administrative support to system backups, ensuring all backups are completing as scheduled and the system operates in an optimized manner.
• Develop an operating system lifecycle plan with integration of NNSA STIGs and other recommended security standards.
• Monitor all solutions integrated via a centralized alerting system.
• Certify log management and forwarding to a single repository.
• Serve as a technical expert for the development, implementation, management, and support of systems and networks. Plan and execute complex assignments, developing new methods and approaches in a wide variety of IT specialties.
• Maintain group policy, AD directory structure, and deployment of policies.
• Provide domain-level configuration, administration, operation, and support for the enterprise.
• Support hardware and software management; monitor and manage a software license repository across the enterprise for recording and tracking software licensing/support agreements.
• Provide configuration management support in accordance with compliance and policies and procedures.
• Perform account management (establishing, activating, modifying, disabling, and removing accounts).
• Provide configuration management, implementation, and sustainment of compliance with applicable system security controls.
• Provide support to IT systems including day-to-day operations, monitoring and problem resolution for all client/server/storage/network devices, mobile devices, etc.
• Optimize system operations and resource utilization, and perform system capacity analysis and planning.
• Provide in-depth troubleshooting experience for IT systems.

• Bachelor’s degree in computer science, Information Technology, or a related field (or equivalent work experience) or Technical Training, Certifications, and 8+ years of experience.

• At least 5-7 years of experience as a Systems Administrator or similar role.
• Strong experience with Linux and Windows-based systems administration.
• Knowledge of cloud platforms (AWS, Azure, Google Cloud).
• Experience with virtualization technologies (VMware, Hyper-V).
• Familiarity with containerization technologies like Docker and Kubernetes is a plus.
• Experience with system monitoring tools (e.g., Nagios, Zabbix, Solar Winds).
• Experience with backup strategies and industry tools such as Commvault.
• Knowledge of scripting languages (e.g., Power Shell) for automation tasks.
• Strong troubleshooting and problem-solving abilities.
• Solid understanding of networking protocols and concepts (DNS, DHCP, TCP/IP, VPN, etc.).
• Expert knowledge and experience in current Windows client/server to include OS configuration, file sharing, DNS,…