Sr. Cyber Network Engineer, CHANTILLY, VA


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Full time

Posted 5 Days Ago


Secure our Nation, Ignite your Future

Job Requisition:   Sr. Cyber Network Engineer

Become an integral part of a diverse team while working at an Industry Leading Organization, where our employees come first.  At ManTech International Corporation, you’ll help protect our national security while working on innovative projects that offer opportunities for advancement.

As a Sr. Cyber Network Engineer, you will be responsible for expanding network modeling of various vendor network devices, such as routers, switches, load balancers and firewalls as well as virtual network devices in software-defined networking (SDN) and cloud environments.  Research various network devices’ features affecting “access” and create a proposal for modeling such features in RedSeal.  Examples are access lists, VRF, MPLS VPN, IPSec VPN, NAT, static routes, converged dynamic routing tables as well as high availability.  Work closely with development engineers to implement the proposed modeling of the network device as a plugin that can be loaded into RedSeal.  As such, you will introduce new data streams from network devices into RedSeal’s analytics engine.

Currently, ManTech is seeking a motivated, career and customer-oriented Sr. Cyber Network Engineer to join our team in the Chantilly, VA, area.

Responsibilities include, but are not limited to:

Prioritize requirements based on the needs of the project 
Interacts with other team members and customers at multiple levels to gather, supply, or coordinate information 
Good communication and customer service skills are needed along with ability to coordinate effectively with individuals from multiple levels 
Work closely with customers on onboarding, updates and troubleshooting issues with cybersecurity tools
Provides customer support via phone, email, or messaging services to resolve issues and answer questions.  This includes maintaining communication throughout the entire process, as necessary.
Provides insight into efficiencies that can be gained from the current workflow based on an understanding of the customers’ requirements
Work with Engineers on troubleshooting and building proof-of-concept network topologies
Analyze customer feedback to assist in process improvement
Performs engineering support and system administration of specialized cybersecurity applications and systems to include installation, configuration, maintenance, patching, and back-up/restore
Provides Tier 3 maintenance and engineering support for deployed cybersecurity technologies
Supports Assessment and Authorization activities related to cybersecurity technologies, where applicable
Identifies potential conflicts with implementation of any cybersecurity tools within the enterprise and develops recommendations to remediate these conflicts
Provides ideas for automating repetitive project tasks and metrics collection through the use of scripts and assists with testing/implementation to production
Updating project documentation, where applicable
Other project and corporate duties as assigned to support the customer

Basic Qualifications:

Minimum education: B.S. or relevant experience in related field
Minimum/general experience: 5 – 7 years of related network experience (firewalls, routers, switches and load balancers)
A solid understanding of Windows and Linux systems, general operating system security practices, TCP/IP networking, and network security concepts is required
Knowledge of and the use of AWS cloud technologies
Ability to thrive in a dynamic, agile, and nimble environment
Excellent written/oral communications skills and strong analytical and problem-solving skills
Excellent organization, planning, and multi-tasking skills with attention to detail
Must have or be willing to obtain IAT Level II or higher certification within 6 months of hire

Preferred Qualifications:

Understanding of federal Cyber Security Guidance such as NIST SP 800-37 – Guide for Applying the Risk Management Framework (RMF) to Federal Information Systems and NIST 800-137 – Information Security Continuous Monitoring (ISCM) for Federal Information Systems and Organizations
Experience in programming languages such as Python, Go, Java, Java Script, Node.js
Ability to function in a fast-paced environment and effectively manage multiple tasks simultaneously; coordinating resources and ensuring scheduled goals are met
Ability to effectively interact with various levels of senior management is necessary
Ability to make decisions and resolve problems effectively – seek out information and data to evaluate, prioritize and formulate best solution or practice
Must be able to multi-task, work independently and as part of a team, share workloads, and deal with sudden shifts in project priorities

On the job training (Must have all basic qualifications to get hired, but on the job training for below):

Other cybersecurity tools as necessary

Security Clearance Requirements:

Must possess an active TS/SCI w/ Polygraph

Physical Requirements:

Must be able to remain in a stationary position 50%
Constantly operates a computer and other office productivity machinery, such as a calculator, copy machine and computer printer
The person in this position frequently communicates with co-workers, management and customers, which may involve delivering presentations. Must be able to exchange accurate information in these situations
Ability to work in a cubicle environment without distractions


For all positions requiring access to technology/software source code that is subject to export control laws, employment with the company is contingent on either verifying U.S.-person status or obtaining any necessary license. The applicant will be required to answer certain questions for export control purposes, and that information will be reviewed by compliance personnel to ensure compliance with federal law. ManTech may choose not to apply for a license for such individuals whose access to export-controlled technology or software source code may require authorization and may decline to proceed with an applicant on that basis alone.

ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment because of race, color, sex, religion, age, sexual orientation, gender identity and expression, national origin, marital status, physical or mental disability, status as a Disabled Veteran, Recently Separated Veteran, Active Duty Wartime or Campaign Badge Veteran, Armed Forces Services Medal, or any other characteristic protected by law.

If you require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please contact ManTech’s Corporate EEO Department at (703) 218-6000. ManTech is an affirmative action/equal opportunity employer – minorities, females, disabled and protected veterans are urged to apply. ManTech’s utilization of any external recruitment or job placement agency is predicated upon its full compliance with our equal opportunity/affirmative action policies. ManTech does not accept resumes from unsolicited recruiting firms. We pay no fees for unsolicited services.

If you are a qualified individual with a disability or a disabled veteran, you have the right to request an accommodation if you are unable or limited in your ability to use or access as a result of your disability. To request an accommodation please contact and provide your name and contact information.

ManTech / Equal Opportunity Employer

JBMAN-R36061 2023.07.16

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