Senior Network Engineer (SEAS) with Security Clearance - Synertex LLC : Job Details

S enior Network Engineer (SEAS) Springfield, VA Full-Time | On-site | Immediate Hire Join Synertex LLC and bring your expertise to a mission that matters. We're looking for a dynamic Senior Network Engineer to join our Systems Engineering and Architecture Services (SEAS) Team in support of a critical national security customer. If you're passionate about modernizing and sustaining complex network infrastructures and thrive in a fast-paced, technically challenging environment-this opportunity is for you. RESPONSIBILITIES * Translate stakeholder and Government requirements into enterprise network solutions, upgrades, and modifications. * Lead the deployment, maintenance, and optimization of Cisco, Juniper, Riverbed, and SolarWinds-based solutions. * Serve as the highest internal escalation tier for the Networking O&M team, providing advanced troubleshooting and Root Cause Analysis (RCA). * Produce and maintain accurate documentation including as-built network diagrams, performance plans, and secure system lifecycle planning. * Collaborate with the IT Architecture and Engineering (A&E) team to research and evaluate new technologies for modernizing network infrastructure. * Support global ROBO and data center network operations with approximately 15% annual travel. * Mentor junior team members and provide on-the-job training (OJT) to elevate team capabilities. REQUIREMENTS * 7+ years of progressive experience in network engineering across enterprise IT systems * Cisco Certified Network Professional (CCNP) Data Center * Associate's Degree OR active certifications (CompTIA Security+ ce, GSEC, or SSCP) * 5+ years of hands-on experience with Cisco Routing and Switching technologies (e.g., BGP, OSPF, QoS, VRF) * Experience with secure encrypted devices (e.g., Taclanes), Next-Gen Firewalls, and network-based security protocols * Strong background in high availability, load balancing, COOP, and secure processing environments (DISA STIGs/SRGs) * Demonstrated experience working in globally dispersed teams and delivering against mission-critical deadlines * Active DoD TS/SCI clearance with the ability to obtain/maintain a CI Polygraph PREFERRED QUALIFICATIONS * CCNP Routing and Switching, CCNP Collaboration, or CCNP Security * Technical certifications in Juniper, Riverbed, and other enterprise solutions * Experience with Cisco ASA, Unified Communications Manager (CUCM), and TelePresence systems * Familiarity with Riverbed Steelhead, SolarWinds NCM, and Juniper Firewalls * Experience with Cisco ACI and Data Center Network Manager (DCNM) for Software Defined Networking (SDN) * Ability to mentor and lead junior engineers while supporting the CSWF Network Operations Specialist role (SECNAV M-5239.2 Intermediate Level) Join a mission-driven team advancing global network operations for national security. Apply today and become part of Synertex LLC's legacy of engineering innovation and technical excellence.