Principal/Senior Principal Network Engineer with Security Clearance

Position Description Serco is seeking a motivated and experienced Principal/Senior Principal Network Engineer to join our team in Stafford, Virginia. In this role, you will be instrumental in supporting a government customer site, maintaining critical network infrastructure, and ensuring secure, reliable network operations. You will be a key contributor in designing, configuring, and monitoring complex local and global networks with a focus on security, optimization, and compliance. In this role, you will: Maintain smooth operation of local area, global, and VPN networks using Cisco ASA and Firepower devices. Plan, evaluate, and coordinate installation or reconfiguration of network hardware and software. Maintain technical expertise in all areas of networking and system integration including routers, switches, firewalls, and servers. Design networks and select appropriate hardware/software solutions to support operational and cost optimization. Conduct continuous monitoring, analyze logs and alerts, and investigate network anomalies. Perform compliance scanning (STIG, SCAP, vulnerability), validate findings, and support system accreditation. Support system administration functions including account setup, documentation, software installation, and performance tuning. Participate in a 24/7 support rotation approximately every 14 weeks. Qualifications Qualifications Level 3: Bachelor's degree in a STEM field with 5 years of relevant experience, or Master's with 3 years, or 9 years of experience in lieu of a degree. Level 4: Bachelor's degree in a STEM field with 9 years of relevant experience, or Master's with 7 years, or 13 years of experience in lieu of a degree. Active Top Secret security clearance with SCI and ability to complete a CI polygraph. Security+ or equivalent certification. Information Assurance Technical (IAT) Level II or higher. Hands-on experience in network design, development, monitoring, and testing. Experience with VLAN configuration, ACL enforcement, and firewall rule sets including NAT and PAT. Strong Windows and Server administration skills. Familiarity with DoD security practices such as STIG compliance and system accreditation. Willingness to travel up to 10%. To be successful in this role, you will have: Proven ability to manage secure network environments. Expertise in integrating and troubleshooting multi-platform network systems. Ability to effectively document findings and recommend network improvements. Additional desired experience and skills: Experience with network modeling tools such as Red Seal. Cisco certifications (e.g., CCNA, CCNP). Hands-on experience with Firepower or Cisco ISE. Familiarity with SPLUNK integration and auditing tools. If you are interested in making an impact with a passionate team, submit your application now for immediate consideration. It only takes a few minutes and could change your career. Company Overview Serco Inc. (Serco) is the Americas division of Serco Group, plc. In North America, Serco's 9,000+ employees strive to make an impact every day across 100+ sites in the areas of Defense, Citizen Services, and Transportation. We help our clients deliver vital services more efficiently while increasing the satisfaction of their end customers. Serco serves every branch of the U.S. military, numerous U.S. Federal civilian agencies, the Intelligence Community, the Canadian government, state, provincial and local governments, and commercial clients. While your place may look a little different depending on your role, we know you will find yours here. Wherever you work and whatever you do, we invite you to discover your place in our world. Serco is a place you can count on and where you can make an impact because every contribution matters. To review Serco benefits please visit: . If you require an accommodation with the application process please email: or call the HR Service Desk at , option 1. Please note, due to EEOC/OFCCP compliance, Serco is unable to accept resumes by email. Candidates may be asked to present proof of identify during the selection process. If requested, this will require presentation of a government-issued I.D. (with photo) with name and address that match the information entered on the application. Serco will not take possession of or retain/store the information provided as proof of identity. For more information on how Serco uses your information, please see our Applicant Privacy Policy and Notice . Serco does not accept unsolicited resumes through or from search firms or staffing agencies without being a contracted approved vendor. All unsolicited resumes will be considered the property of Serco and will not be obligated to pay a placement or contract fee. If you are interested in becoming an approved vendor at Serco, please email . Serco is an equal opportunity employer. We evaluate qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, veteran status, and other legally protected characteristics.