Network Engineer *Active Top Secret Required*

Network Engineer

Location: Onsite – Secure Compartmented Information Facility (SCIF)
Clearance Required: Active Top Secret with SCI eligibility

Job Description

Seeking an experienced Network Engineer to support the U.S. Department of the Treasury’s mission-critical classified IT system that enables Treasury’s national security, intelligence, and counter-threat finance missions.

The selected candidate will operate within a Secure Compartmented Information Facility (SCIF) and be responsible for ensuring the reliability, security, and performance of Treasury’s classified network infrastructure supporting the Treasury Foreign Intelligence Network (TFIN).

This role supports both day-to-day network operations and ongoing modernization efforts in a highly secure environment.

Responsibilities

• Build, configure, and maintain the day-to-day operation of the Treasury Foreign Intelligence Network (TFIN).
• Manage and support Cisco network devices including routers, switches, enterprise firewalls, controllers, and wireless access points.
• Configure, maintain, and troubleshoot firewall policies, access control lists (ACLs), and VPN connectivity in support of mission and security requirements.
• Protect data, software, and hardware by implementing and maintaining DISA STIGs, NIST 800-53, and CNSS 1253 compliant security controls.
• Troubleshoot, diagnose, and resolve complex hardware, software, and connectivity issues across LAN/WAN environments.
• Support secure Video Teleconferencing (VTC) services, including network connectivity, firewall traversal, Quality of Service (QoS), and coordination with system and VTC support teams.
• Support disaster recovery and continuity of operations planning and execution.
• Monitor, analyze, and optimize network performance using tools such as SolarWinds and Wireshark.
• Maintain network documentation including block diagrams, Simple Network Diagrams (SND), and Detailed Network Diagrams (DND).
• Assist in the development of IATT and ATO packages and ensure ongoing accreditation compliance.
• Research, test, and implement emerging network technologies to enhance performance and security.
• Participate in customer briefings, design reviews, and after-action reports.

Qualifications

Required

• Active Top Secret clearance with SCI eligibility (final, favorable adjudication).
• Minimum 5 years of experience supporting network operations in a federal, DoD, or Intelligence Community environment.
• Demonstrated expertise with Cisco enterprise network devices and architectures.
• Hands-on experience supporting enterprise firewall technologies in a secure or regulated environment.
• Strong understanding of LAN/WAN design, network protocols, VLANs, VPNs, and Quality of Service (QoS).
• Experience applying DISA STIGs and NIST security frameworks.
• Proficiency with network monitoring and diagnostic tools (e.g., SolarWinds, Wireshark).
• Strong documentation, communication, and analytical skills.

Desired

• Bachelor’s degree in Information Technology, Computer Science, Network Engineering, or related field.
• Industry certifications such as CCNP, CCNA, Security+, or Network+.
• Experience supporting classified or Intelligence Community networks.
• Familiarity with secure VTC or unified communications environments.
• Exposure to Citrix, hybrid AWS/Azure environments, or Treasury systems.

Additional Information

• This position is onsite in a classified environment; remote or hybrid work is not available.
• U.S. citizenship is required.

Tenacity Solutions, LLC (Tenacity) is a Service-Disabled Veteran Owned Small Business (SDVOSB) founded by our CEO, Gabriel Brown, CAPT, USN (Ret). Tenacity is an innovative company, leveraging talent, skill, and knowledge with cutting-edge and proven practices to deliver solutions and products that exceed customers’ requirements and surpasses their expectations. Tenacity immediately has become a leading technology and management solutions provider with a mission to advance healthcare services for specialized populations including Veterans and their families. Headquartered in North, Bethesda, Maryland (DMV), our talented resources are located across the United States. We bring diverse talent to design solutions that help customers with their greatest challenges.