Sr. Network Security Engineer III
Washington dc, DC
Category: Engineer
Industry: Government
Reference ID: JN -032026-105871
Date Posted: 03/09/2026
Shortcut: http://careers.eliassen.com/GKHxJO
Description:
Onsite in Washington, DC
The Sr. Network Security Engineer III will secure and harden mission-critical enterprise networks for our client within a federal environment. The role will design and manage firewalls, VPNs, IDS/IPS, and NAC, enforce segmentation, and support incident response. The engineer will act as a hands-on subject matter expert, communicate risk to diverse stakeholders, and enable secure mission delivery across the organization.
This is a full-time, permanent opportunity, offering a competitive salary and comprehensive benefits package. Qualified applicants must be willing and able to work on a w2 basis.
Salary: $230,000 - $290,000/ yr. w2
Responsibilities:
- Design, implement, and manage firewalls, VPNs, IPS, and NAC solutions in mission-critical environments.
- Secure network perimeters and internal network segments using defense-in-depth strategies.
- Respond rapidly to security incidents, vulnerabilities, and operational needs with urgency and discipline.
- Support continuous security hardening and improvement of network infrastructure.
- Participate in Agile execution, technical planning, and security risk discussions.
- Communicate security impacts, risks, and mitigation strategies clearly to technical and non-technical stakeholders.
- Recommend and implement security architecture and operational improvements.
- Serve as a hands-on technical SME, contributing immediately with minimal ramp-up.
- Establish and maintain a high level of customer trust and confidence through reliable, secure delivery.
- Apply creativity and engineering judgment to deliver practical, mission-focused security solutions.
- Design, implement, and manage next-generation firewalls, VPN solutions, intrusion prevention systems, and network access control platforms.
- Secure network perimeters and internal segments, including policy design, segmentation, and threat mitigation.
- Deploy and manage firewall rule sets, VPN tunnels, and security policies in mission-critical environments.
- Operate at least one enterprise security platform, such as Palo Alto Networks, Fortinet, or Cisco security technologies.
- Administer Cisco ISE and Cisco ASA environments.
- Implement and manage IDS and IPS solutions and endpoint configuration hardening in secure environments.
- Support Zero Trust architectures and identity-centric network security patterns.
- Contribute immediately with minimal ramp-up in a mission-critical operational environment.
Experience Requirements:
- Active Top Secret security clearance with SCI eligibility.
- Security+ and at least one platform-specific security certification such as PCNSE, Fortinet NSE, or a Cisco security certification.
- DoD 8140 certification aligned to the 441 Network Operations Specialist work role, such as Network+, Security+, Cloud+, SSCP, CASP+, CISSP, or CCNP Security.
- 10+ years of network engineering experience focused on enterprise network security infrastructure.
- 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 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.
- Willingness to serve as essential personnel to support continuity of operations during shutdowns, emergencies, or other critical situations.
Education Requirements:
- Bachelor’s degree in a technical field preferred.
- Security+ certification.
- Platform-specific security certification such as PCNSE, Fortinet NSE, or a Cisco security certification.
- DoD 8140-aligned certification such as Network+, Security+, Cloud+, SSCP, CASP+, CISSP, or CCNP Security.
- Active Top Secret with SCI eligibility security clearance.
W2 employees of Eliassen Group who are regularly scheduled to work 30 or more hours per week are eligible for the following benefits: medical (choice of 3 plans), dental, vision, pre-tax accounts, other voluntary benefits including life and disability insurance, 401(k) with match, and sick time if required by law in the worked-in state/locality.
Please be advised- If anyone reaches out to you about an open position connected with Eliassen Group, please confirm that they have an Eliassen.com email address and never provide personal or financial information to anyone who is not clearly associated with Eliassen Group. If you have any indication of fraudulent activity, please contact InfoSec@eliassen.com.
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Eliassen Group is an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, gender identity, national origin, age, protected veteran status, or disability status. Eliassen Group’s Affirmative Action Plan (AAP) is available for inspection by any employee or applicant for employment upon request, during normal business hours of Monday through Friday, 8:30am to 5:30pm EST. Interested persons should contact Phaedra Wells at pwells@eliassen.com for assistance. It is unlawful in Massachusetts and Maryland to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.
Applicants with disabilities that believe they require an accommodation or assistance with a position, please email our HR team at hradmin@eliassen.com. This email inbox is designed exclusively to assist job seekers whose disability prevents them from being able to apply online. Emails sent for other purposes will not receive a response.
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Unfortunately, fraudulent job postings can happen. If anyone reaches out to you about an open position connected with Eliassen Group, never provide personal or financial information to anyone who is not clearly associated with Eliassen Group
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