Network Security Engineer

Sr. Network Security Engineer IIIAs a Sr. Network Security Engineer III, you'll provide hands-on expertise securing mission-critical networks for a high-visibility customer with the goal of making an impact across the federal government. Our team is responsible for designing, operating, and hardening complex security environments, and you'll play a critical role in strengthening, scaling, and protecting these environments while enabling secure mission delivery across the organization.What you'll do:Design, implement, and manage firewalls, VPNs, IPS, and NAC solutions in mission-critical environmentsSecure network perimeters and internal network segments using defense-in-depth strategiesRespond rapidly to security incidents, vulnerabilities, and operational needs with urgency and disciplineSupport continuous security hardening and improvement of network infrastructureParticipate in Agile execution, technical planning, and security risk discussionsCommunicate security impacts, risks, and mitigation strategies clearly to technical and non-technical stakeholdersRecommend and implement security architecture and operational improvementsServe as a hands-on technical SME, contributing immediately with minimal ramp-upEstablish and maintain a high level of customer trust and confidence through reliable, secure deliveryApply creativity and engineering judgment to deliver practical, mission-focused security solutionsDemonstrated subject matter expertise designing, implementing, and managing next-generation firewalls, VPN solutions, intrusion prevention systems, and network access control platforms. Hands-on experience securing network perimeters and internal network segments, including policy design, segmentation, and threat mitigation. Operational experience deploying and managing firewall rule sets, VPN tunnels, and security policies in mission-critical environments. Hands-on experience with at least one enterprise security platform, such as Palo Alto Networks, Fortinet, or Cisco security technologies. Hands-on experience with Cisco ISE and Cisco ASA environments. Hands-on experience with IDS and IPS solutions and endpoint configuration hardening in secure environments. Experience supporting Zero Trust architectures and identity-centric network security patterns. Ability to contribute immediately with minimal ramp-up in a mission-critical operational environment.What you'll need to succeed:Active Top Secret security clearance with SCI eligibility requiredRequired technical certifications include Security+ and at least one platform-specific security certification, such as PCNSE, Fortinet NSE, or a Cisco security certificationPossess DoD 8140 certification aligned to the 441 Network Operations Specialist work role, such as Network+, Security+, Cloud+, SSCP, CASP+, CISSP, or CCNP Security10+ years of experience in network engineering with a primary focus on enterprise network security infrastructureBachelor's degree in a technical field is preferred. Relevant experience may substitute for education requirementsAbility to contribute immediately with minimal ramp-up in a mission-critical operational environment