Senior Network Engineer with Security Clearance

Job Description ECS is seeking a Senior Network Engineer to work in our Arlington, VA office / remote . The Network Engineer will play a critical role in supporting a large-scale federal IT modernization initiative focused on transforming legacy infrastructure into secure, scalable, and cloud-ready network architectures. This position requires collaboration with federal stakeholders, systems integrators, and cross-functional technical teams to design, implement, and maintain enterprise network solutions that meet strict federal security requirements and compliance standards. The successful candidate will contribute to the migration of mission-critical systems while ensuring minimal disruption to ongoing federal operations and maintaining the highest levels of cybersecurity and data protection. Responsibilities * Network Architecture & Design: Develop comprehensive network designs for hybrid cloud environments, including on-premises data centers, public cloud platforms (AWS GovCloud, Azure Government), and secure connectivity solutions that support federal agency requirements * Infrastructure Migration: Lead the planning and execution of network infrastructure migrations from legacy systems to modernized platforms, ensuring seamless transition of critical federal services and applications * Security Implementation: Design and implement network security controls including firewalls, intrusion detection systems, VPNs, and zero-trust architecture principles in compliance with federal cybersecurity frameworks (NIST, FedRAMP, FISMA) * Performance Optimization: Monitor, analyze, and optimize network performance across distributed federal environments, implementing solutions to improve bandwidth utilization , reduce latency, and enhance user experience * Documentation & Compliance: Maintain detailed network documentation, configuration management databases, and ensure all implementations meet federal compliance requirements including Authority to Operate (ATO) processes * Incident Response: Participate in 24/7 network operations support, troubleshoot complex network issues, and coordinate with federal IT security teams during incident response activities * Stakeholder Collaboration: Interface with federal program managers, security officers, and technical teams to translate business requirements into technical network solutions and provide regular status updates on modernization progress Required Skills * U.S. Citizen * Bachelor's degree in Computer Science , Information Technology, or related technical field * Minimum 5 years of experience in enterprise network engineering with demonstrated experience in federal or highly regulated environments * Ability to obtain and maintain a DHS Public Trust suitability determination Desired Skills * Professional certifications: CCNP, CCIE, or equivalent Cisco/Juniper certifications * Hands-on experience with federal cloud platforms (AWS GovCloud, Microsoft Azure Government) * Deep understanding of federal cybersecurity requirements (NIST Cybersecurity Framework, FedRAMP, FISMA) * Proficiency in network protocols (BGP, OSPF, MPLS, SD-WAN) and enterprise networking technologies * Cloud networking certifications (AWS Advanced Networking, Azure Network Engineer) * Experience with Infrastructure as Code (Terraform, CloudFormation, Ansible) * Knowledge of federal procurement processes and contractor requirements * Previous experience on federal IT modernization or digital transformation programs * Familiarity with federal compliance frameworks (DISA STIGs, CNSSI-1253) * Experience with network automation and programmability (Python, REST APIs) * Project management experience in federal contracting environments #ECS1 ECS is an equal opportunity employer and does not discriminate or allow discrimination on the basis any characteristic protected by law. All qualified applicants will receive consideration for employment without regard to disability, status as a protected veteran or any other status protected by applicable federal, state, or local jurisdiction law. ECS is a leading mid-sized provider of technology services to the United States Federal Government. We are focused on people, values and purpose. Every day, our 3300+ employees focus on providing their technical talent to support the Federal Agencies and Departments of the US Government to serve, protect and defend the American People.