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Senior Firewall Engineer

Type: Full-time
Category: Network Engineer
Location: Reston, VA
Clearances: Secret; TS; TS/SCI; TS/SCI with CI Poly; TS/SCI with Full Poly


As a member of our solutions delivery team, you will have the unique opportunity to work on programs advancing the digital transformation of critical government systems. This program is operating and enhancing Open Source sources and collection through the delivery of superior network, platform, and systems engineering solutions.

Job Description:

NT Concepts is seeking an experienced Network Security Engineer to design and implement a scalable, efficient, secure & cost-effective network infrastructure. As the Security Engineer you will focus on planning, coordinating, and implementing network security measures to protect data, software, and hardware.


Primary Responsibilities:

  • Participate in discovery, design, deployment of network security hardware and software
  • Install, configure, and support firewalls, routing, switching, security, load-balancers, and related technologies.
  • Researching, configuring, and testing various network devices in a lab setup before deploying to customer production environments
  • Working within established configuration and change management policies to ensure awareness, approval, and success of changes made to the network infrastructure
  • Monitoring and analyzing network characteristics utilizing Cisco ADSM, ACS, and other related utilities and appliances
  • Preparing script configuration files for Cisco devices, such as routers, switches, firewalls, gateways, email guards, and anti-malware systems
  • Evaluating and reporting on new network technologies to enhance capabilities of the network
  • Providing installation instructions and procedures to assist with deployment and troubleshooting for maintenance support groups


Basic Qualifications:

  • Clearance: Minimum Secret clearance required; Active TS/SCI with Full-Scope Poly (active) preferred.
  • Experience configuring and operating various firewall platforms (e.g., Cisco NGFW/ASA and Juniper SRX)
  • Experience working with IDS/IPS products (e.g., Cisco FMC/Firepower, Fortinet, and TippingPoint)
  • Experience with Antivirus, anti-malware, and email security appliances (e.g., Cisco ESA and Cisco FireAMP)
  • Administrator level ability with Unix (e.g., Linux or other variant)
  • Experience creating network diagrams utilizing Microsoft Visio
  • Experience with development and maintenance of high Level and low-level Design documentation
  • Strong troubleshooting skills, analytical problem- solving ability, and organizational skills


Clearance: Minimum of a Secret clearance with ability to obtain TS/SCI with Full Scope Poly

Preferred Qualifications:

  • Experience with software-defined networking and software-defined WAN technology


Location: Reston, VA with remote flexibility


Physical Requirements

  • Prolonged periods setting at a desk and working on a computer.
  • Must be able to lift 10-15 pounds at times.



Working at NT Concepts means that you are part of an innovative, agile company dedicated to solving the most critical challenges in National Security. We're expert leaders and problem solvers who roll up our sleeves to get the job done. We're passionate, curious, and committed to doing important work. At the same time, we're life-long learners, avid mentors, and we like to have fun.

We're looking for the best and the brightest to join us in supporting the mission of National Security. If meaningful work, initiative, creativity, and continuous self-improvement are important to your career, join our growing talent network and discover What's Next for you.

NT Concepts is committed to hiring and retaining a diverse workforce. We are proud to be an Equal Opportunity/Affirmative Action Employer, making decisions without regard to race, color, religion, creed, sex, sexual orientation, gender identity, marital status, national origin, age, veteran status, disability, or any other protected class. U.S. Citizenship is required for all positions. Contact us if you need a reasonable accommodation for any part of the employment process. All resumes are held in confidence. NT Concepts participates in E-Verify.