Job description

Xenith Solutions is seeking a highly skilled SME Network & Computer Systems Administrator to support DHS ICE Homeland Security Investigations (HSI) Title III and Linguists Unit (T3LU) under the CALEA program. This role provides advanced technical leadership and mission-critical support for secure law-enforcement systems operating 24/7 across multiple locations. The SME Administrator will manage and troubleshoot enterprise networks, servers, virtual environments, and security configurations while collaborating on the design and maintenance of the CALEA Continuity of Operations (COOP) site in Scottsdale, AZ. A shared responsibility among government, and vendor partners. Responsibilities • Install, configure, administer, and maintain CALEA LAN/WAN infrastructure, servers, SANs, and network devices • Administer Active Directory (AD), including: • Promoting/demoting domain controllers • Troubleshooting DNS and DHCP issues • Managing GPO hierarchy and execution • Writing and maintaining PowerShell/Bash scripts for automation • Analyzing event logs and Windows system errors • Plan, deploy, and maintain COOP and DR capabilities in coordination with the Government and vendor partners, ensuring redundancy and failover readiness • Patch and update servers and workstations; ensure security baseline compliance with DHS and FISMA standards • Apply and troubleshoot security hardening requirements and vulnerability remediation; support the ATO process and collaborate with the ISSO to resolve findings • Administer virtualization and storage platforms, including: • VMware ESXi/vCenter – patching, updates, capacity planning, troubleshooting • Nutanix – cluster management and maintenance • NetApp – SAN/NAS configuration and data management • Assist with Palo Alto firewall deployment and rule migration (from Cisco ASA 5506) to support network segmentation and high availability • Configure and troubleshoot Cisco and Dell switches; support VPN tunnels and IP transition projects (copper to fiber) • Support lab environment setup and testing for patch validation and COOP simulation • Perform hardware replacement (hard drives, memory modules, power supplies, etc.) • Maintain technical documentation, diagrams, and SOPs in CALEA repositories • Liaise with Harmonia and ICE technical leads to coordinate troubleshooting and mission support Required Qualifications • Bachelor’s degree in IT, Engineering, or related field OR +5 years equivalent experience • 10+ years enterprise IT systems/network administration experience • Preferred Certifications: • Microsoft Certified Solutions Associate (MCSA) • Microsoft Certified Systems Engineer (MCSE + Security) • CompTIA Security+ (active certification preferred) • PMP (Project Management Professional) • Proficiency in: • Active Directory, DNS, DHCP, and GPO management • PowerShell or Bash scripting for automation and administration • VMware, Nutanix, and NetApp administration • Windows Server and Linux system management • Server/workstation patching and security remediation • Security standards, ATO processes, and coordination with ISSO • Cisco/Dell network devices and Palo Alto firewalls • Excellent communication skills with both technical and non-technical stakeholders • Ability to work independently in high-pressure, mission-critical environments Preferred Qualifications • Experience supporting federal law enforcement IT systems or CALEA-related operations • Hands-on experience assisting with the design or deployment of COOP/DR sites • Knowledge of Palo Alto firewall configuration and migration • Familiarity with Kubernetes or containerized applications (e.g., JSI platforms) • Experience with static routing, VPN tunnels, and multi-site network resiliency • Familiarity with lab testing and replication validation processes • Prior experience supporting high-availability, 24/7 mission operations Soft Skills • Analytical and detail-oriented with strong initiative • Adaptability to changing mission needs and operational tempo • Collaborative approach with vendors (JSI, Palo Alto) and government teams

Requirements