Senior Principal Network Engineer

Company: GD Information Technology
Location: Arlington
Posted on: April 4, 2026

Job Description:

Type of Requisition: Regular Clearance Level Must Currently Possess: Top Secret Clearance Level Must Be Able to Obtain: Top Secret Public Trust/Other Required: None Job Family: IT Infrastructure and Operations Job Qualifications: Skills: Aruba ClearPass, DNS Management, Enterprise Network, IT Network Security Certifications: None Experience: 10 years of related experience US Citizenship Required: Yes Job Description: GDIT is seeking a Senior Principal Network Engineer to help support our JSP ETM-NG activities at the Pentagon. Due to the nature of work this role entails, telecommuting is not allowed. You will provide technical leadership for the Core Transport Network Engineering team and ensures the health, stability, and performance of a large, complex enterprise network. This role oversees more than 8,000 network devices, guiding engineers on best practices, executing network upgrades, and leading troubleshooting efforts. Responsibilities include comprehensive network administration, security remediation, and support for routers, switches, load balancers, VPNs, wireless, and VoIP systems. The engineer works both independently and collaboratively across teams. MEANINGFUL WORK AND PERSONAL IMPACT • Serve as subject-matter expert in routing, switching, network performance, and troubleshooting. • Lead design reviews, system enhancements, and provide recommendations to management and clients. • Assess new applications, infrastructure, and cloud solutions for alignment with enterprise strategy. • Define system specifications and ensure hardware/software compatibility. • Mentor junior engineers and support technical staff; may provide supervisory oversight. • Act as senior liaison with clients, ensuring requirements and expectations are met. • Resolve incidents and coordinate vendor support when needed. • Deploy and maintain network hardware and services per industry standards. • Perform daily monitoring and review logs to validate system health and availability. • Document and execute configuration changes during maintenance windows. • Lead on?call troubleshooting and resolution activities. • Develop and maintain installation, configuration, and process documentation. • Partner with Security teams to identify and remediate vulnerabilities. • Collaborate with cross?functional teams to support diverse user needs. • Create automation scripts to support migrations and operational tasks. • Perform root?cause analysis and ensure effective long?term fixes. • Support multiple projects and stay current on emerging technologies. • Participate in special projects as assigned. WHAT YOU'LL NEED TO SUCCEED - REQUIRED: CLEARANCE: Active Top Secret clearance CERTIFICATIONS: DoD 8570 IAT Level II certification At least ONE active network certification - CCNA, CCNP, or ACSA EDUCATION: Bachelor’s degree in a technical field or equivalent experience YEAR’S EXPERIENCE: 10 years of IT experience TECHNICAL SKILLS: Advanced knowledge of IT principles, network engineering, and troubleshooting Extensive experience with Cisco/Juniper hardware and SDN technologies Proficiency with routing and switching protocols (TCP/IP, MPLS, OSPF, BGP, SDN, 802.1x) Experience with DNS, DHCP, IPAM, NTP across multi?site environments Strong background in network security (firewalls, IDS/IPS, VPN, remediation) Familiarity with network monitoring tools (SolarWinds, NetScout, NetCool, NetBrain, Infovista, Clearpass, Aruba, Arista) CLI configuration experience and scripting for automation Strong documentation, hardware troubleshooting, and customer?service skills Experience supporting remote users and teleworkers LOCATION: Arlington, VA (on?site at the Pentagon) DESIRED QUALIFICATIONS: CLEARANCE: Active TS/SCI or TS with SCI eligibility TECHNICAL SKILLS: Experience with proposals, Remedy ITSM, Linux/Windows/UNIX administration, and Visio network diagrams GDIT IS YOUR PLACE At GDIT, the mission is our purpose, and our people are at the center of everything we do. Growth: AI-powered career tool that identifies career steps and learning opportunities Support: An internal mobility team focused on helping you achieve your career goals Rewards: Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time off Community: Award-winning culture of innovation and a military-friendly workplace OWN YOUR OPPORTUNITY Explore an enterprise IT career at GDIT and you’ll find endless opportunities to grow alongside colleagues who share your desire to drive operations forward. The likely salary range for this position is $191,250 - $258,750. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience, geographic location and possibly contractual requirements and could fall outside of this range. Scheduled Weekly Hours: 40 Travel Required: Less than 10% T elecommuting Options: Onsite Work Location: USA VA Arlington Additional Work Locations: Total Rewards at GDIT: Our benefits package for all US-based employees includes a variety of medical plan options, some with Health Savings Accounts, dental plan options, a vision plan, and a 401(k) plan offering the ability to contribute both pre and post-tax dollars up to the IRS annual limits and receive a company match. To encourage work/life balance, GDIT offers employees full flex work weeks where possible and a variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave. To ensure our employees are able to protect their income, other offerings such as short and long-term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available. We regularly review our Total Rewards package to ensure our offerings are competitive and reflect what our employees have told us they value most. We are GDIT. A global technology and professional services company that delivers consulting, technology and mission services to every major agency across the U.S. government, defense and intelligence community. Our 30,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 50 countries worldwide, offering leading capabilities in digital modernization, AI/ML, Cloud, Cyber and application development. Together with our clients, we strive to create a safer, smarter world by harnessing the power of deep expertise and advanced technology. Join our Talent Community to stay up to date on our career opportunities and events at gdit.com/tc . Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans

Keywords: GD Information Technology, Fort Worth , Senior Principal Network Engineer, IT / Software / Systems , Arlington, Texas