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Added 7 mins ago
Network Engineer 3
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Working knowledge of Microsoft 365, Azure, cloud infrastructure, cybersecurity, backup and disaster recovery, networking, and endpoint management.

GD Information Technology, Inc.

Sr. Network Security Engineer

United States

The likely salary range for this position is $142,792 - $172,500.

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Job details

Pay: The likely salary range for this position is $142,792 - $172,500.
Posting language: English
Posted: Nov 3, 2026

Original job description

Type of Requisition:

Regular

Clearance Level Must Currently Possess:

None

Clearance Level Must Be Able to Obtain:

None

Public Trust/Other Required:

NACI (T1)

Job Family:

Cyber and IT Risk Management

Job Qualifications:

Skills:

Cisco ASA Firewall, Cisco Firewall Security, Cisco Identity Services Engine (ISE), Cisco IPS, Cisco NACCertifications:

NoneExperience:

10 + years of related experienceUS Citizenship Required:

Job Description:

The Senior Network Security Engineer is responsible for the configuration, deployment, and management of the customer’s NAC solution in a 24x7x365 environment. The senior engineer is accountable for but not limited to monitoring, configuration changes, accounts, and software updates for the customer’s NAC, Cisco ISE and IDS/IPS solutions. The engineer must be able to analyze, troubleshoot, and remediate issues within the enterprise. The engineer will also work closely with other teams to ensure that these solutions are performing to standard.

This position is located at 6555 Rock Spring Drive, Bethesda, MD travel is primarily local in the DC metro area.

Responsibilities:

Collaborate in the Architecture and Administration of LAN technologies of Cisco Switches and Cisco ASA Firewalls
Collaborate in the architecture and Administration of Network Access Control systems including but not limited Cisco ISE, Forescout, Cisco ACS, RSA, Cisco AnyConnect, Gigamon, IDS/IPS.
Troubleshoot and problem solve a wide variety of client/user issues and act as an escalation point for LAN/NAC related issues
Work closely with other IT functional teams to ensure cohesive support and strategies across the IT organization
Support the development of project schedules and execute as authorized
Maintain relationships with key Third-Party software/hardware vendors to provide support to the infrastructure as needed.
Provide daily support for tickets: service requests, incidents, problems, and tasks
Execute tasks to support projects
Provide regular updates to tickets
Produce daily/weekly status reports
Develop and execute change request plans
Identify appropriate security access control solutions to satisfy customer business objectives/requirements
Develop High-Level Designs (HLDs) and Low-Level Designs (LLDs)
Document physical and logical topologies for security solutions
Develop High-Level task lists/Work Breakdown Structure (WBS)
Determine the Level of Effort (LOE) for service/solutions
Develop Bills of Materials (BOMs) and participate in the decision-making process for the acquisition of current/new technologies for the customer environment
Document solution risks, issues and mitigation strategies
Create and maintain network diagrams
Provide Subject Matter Expertise for network security technologies
Meet with management and the customer to present and discuss design and implementation efforts

Required Skills:

BS degree in Computer Science, Information Systems or equivalent.
Must have a minimum of 10 years of experience implementing and maintaining Network Access Control technologies (Cisco IDS/IPS, ISE, Forescout, Cisco AnyConnect, etc.)
Must have minimum 10 years of experience in a Network Engineering role.
Experience with network infrastructure in enterprise datacenter solutions.
Experience with mid to large scale implementations of Network Access Control technologies.
Ability to obtain/maintain a Public trust which requires background check, fingerprints, etc.

Desired Skills:

Cisco CCNA/CCNA/Security, CCNP/CCNP Security, CCIE certifications
Cisco SISE certification
Forescout FSCA/FSAA/FSCE certifications
Experience with Cisco wireless LAN controllers.
Experience with Forescout security products.
Experience configuring Cisco ASAs and switches.
Experience configuring 802.1X.
Experience configuring and implementing network segmentation including VLANs and MPLS.
Experience with multiple end-system operating systems including Windows, Linux, Mac OS, and Apple IOS.
Experience with ServiceNow and Visio is an asset

The likely salary range for this position is $142,792 - $172,500. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience, geographic location and possibly contractual requirements and could fall outside of this range.

Scheduled Weekly Hours:

Travel Required:

None

Telecommuting Options:

Hybrid

Work Location:

USA MD Bethesda

Additional Work Locations:

Total Rewards at GDIT:

Our benefits package for all US-based employees includes a variety of medical plan options, some with Health Savings Accounts, dental plan options, a vision plan, and a 401(k) plan offering the ability to contribute both pre and post-tax dollars up to the IRS annual limits and receive a company match. To encourage work/life balance, GDIT offers employees full flex work weeks where possible and a variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave. To ensure our employees are able to protect their income, other offerings such as short and long-term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available. We regularly review our Total Rewards package to ensure our offerings are competitive and reflect what our employees have told us they value most.

Our Identity Verification Process:

As part of the hiring process, we will ask you to complete an identity verification process that leverages advanced biometrics and artificial intelligence to ensure authenticity and protect against identity fraud. You are expected to be on camera during virtual interviews. We reserve the right to take your picture to verify your identity and prevent fraud. By proceeding, you authorize the collection, processing, and use of your biometric data for identity verification and security purposes.

About Our Work:

We are GDIT. A global technology and professional services company that delivers technology solutions and mission services to every major agency across the U.S. government, defense and intelligence community. Our 26,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 50+ countries worldwide, offering leading mission-ready capabilities in AI, cloud, cyber and software development.

Join our Talent Community to stay up to date on our career opportunities and events atgdit.com/tc.

Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans

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More about this job

Skills

Risk management
IPS
IDS
Troubleshoot
LAN
Microsoft Access
Control systems
Cisco AnyConnect
Decision making
Computer science
CCNA
CCNP
Microsoft Windows
Linux
Apple iOS

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