ManTech International

Network Firewall Engineer

ManTech International • $90K — $120K *
Virginia Beach, VA 23464In-Person
Information Technology
Less than 5 years of experience
Today
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Job Overview by Ladders

Qualifications

  • Masters degree with 3+ years or Bachelors with 5+ years of experience in networks, or High School Diploma with 9+ years of experience.
  • Proficient in systems administration for both Linux and Windows environments.
  • Possession of or ability to obtain VMware, Windows, or Linux OS certification within 6 months of hire.
  • Minimum IAT-II level certification, such as CompTia Sec+, per DoD standards.
  • Strong analytical skills with keen attention to detail.

Responsibilities

  • Support the Project Manager in a matrix organization.
  • Plan and execute installation of new capabilities across enterprise managed networks.
  • Manage hardware installation and maintenance, focusing on routers, switches, and firewalls.
  • Configure and deploy Firepower Threat Defense devices and integrate them with the Firewall Management Center.
  • Edit and enforce network security policies including access control and intrusion prevention.
  • Diagnose and resolve complex FTD and FMC issues, ensuring network efficiency and security.
  • Foster a collaborative team environment promoting innovation and efficiency.

Benefits

  • Onsite work environment in Virginia Beach, VA.
  • Opportunity for professional development and certifications.
  • Collaborative team culture focused on innovation.
  • Anticipated travel of up to 25% for client support and meetings.
  • Ability to work on complex network security tasks.
Full Job Description
General information

Requisition #

R68530

Locations

USA-VA-Virginia Beach

Posting Date

06/10/2026

Security Clearance Required

TS/SCI

Remote Type

Onsite

Time Type

Full time

Description & Requirements

MANTECH seeks a motivated, career and customer-oriented Network Firewall Engineer to join our team in Virginia Beach, VA. This position is onsite.

Responsibilities include but are not limited to:
  • Reports directly to the Project Manager and supports execution in a matrix organization.
  • Responsible for planning and executing the installation of new capabilities, as well as operating, maintaining, and troubleshooting network connectivity and infrastructure on enterprise managed networks across classification levels.
  • Responsible for hardware installation, management, and patching, including routers, switches, and firewalls, and managing the flow and safekeeping of data to maintain network efficiency and security.
  • Configures and deploys new Firepower Threat Defense (FTD) devices and integrates them with the Firewall Management Center (FMC).
  • Edits and enforces policies, to include access control rules, intrusion prevention system (IPS) and file/malware policies.
  • Diagnoses and resolves complex issues related to FTD and FMC, maintaining network efficiency and security.
  • Support a team environment based on mutual respect and teamwork, dedicated to innovation and effective, efficient work practices.


Minimum Qualifications:
  • Masters degree and 3+ years of relevant network experience, or a Bachelors degree and 5+ years of relevant network experience, or a High School Diploma and 9+ years of relevant network experience in lieu of a Masters degree
  • Experience in systems administration with proficiency in both Linux and Windows environments
  • VMware, Windows, or Linux Operating System (OS) certification, or ability to obtain within 6 months of hire
  • IAT-II level at a minimum in accordance with SECNAV M-5239.2 and DoD 8140/8570. (ex. CompTia Sec+)
  • Strong analytical skills and attention to detail


Preferred Qualifications:
  • Familiarity with the United States Navy preferred
  • Extensive experience and judgment to plan and accomplish goals and independently performs a wide variety of complicated tasks
  • Strong technical, interpersonal, written, and verbal skills


Clearance Requirements:
  • Must have a current and active TS/SCI Clearance with ability to obtain SAP access.


Physical Requirements:
  • Up to 25% travel anticipated.
  • Work will require movement from Government site to/from MANTECH site for client meetings and support functions.
  • The person in this position must be able to remain in a stationary position 50% of the time.
  • Occasionally move about inside the office to access file cabinets or to communicate with co-workers, management, and customers, via email, phone, and or virtual communication, which involve delivering presentations.


About ManTech International

ManTech International Corporation is an American defense contracting firm that was founded in 1968. The company provides cybersecurity, intelligence, and defense solutions to the United States Government. ManTech has over 9,000 employees and operates in 40 countries worldwide. The company's services include software development, systems engineering, and enterprise IT solutions. ManTech has been awarded numerous contracts by the U.S. Department of Defense and other government agencies.
Learn more about ManTech International
Size
9,800 employees
Market Cap
$3.7 billion
Industry
Information Technology
Net Income
$120.5 million
Founded
1968
5 Year Trend
+9.8%
Revenue
$2.5 billion
NASDAQ
MANT
* Ladders Estimates

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