Demo

Network Security Engineer III (25-393) E4 / COS-83

Apex Systems
Colorado, CO Full Time
POSTED ON 11/18/2025
AVAILABLE BEFORE 12/17/2025
Job#: 2090730

Job Description:

CANDIDATES MUST HOLD AN ACTIVE SECRET SECURITY CLEARANCE OR HIGHER AND BE ABLE TO WORK ONSITE TO BE CONSIDERED

Network Security Engineer III

NES

E4

COS-83

Secret

IAT - Level II

Must have a Bachelor of Science Degree with 5 or more years of experience or a Master of Science Degree with 3 years of experience. Degrees must be in a relevant field of study.

Must have an IAT Level II (8570) Compliant Certification such as Security CE, CASP CE, GSEC, SSCP, CND, GICSP, etc.

Must have an active Secret Clearance

Must have a Bachelor of Science Degree with 5 or more years of experience or a Master of Science Degree with 3 years of experience. Degrees must be in a relevant field of study.

Must have an IAT Level II (8570) Compliant Certification such as Security CE, CASP CE, GSEC, SSCP, CND, GICSP, etc.

Must have an active Secret Clearance

Must be able to travel to alternate work locations, such as Schriever Space Force Base, to execute job duties such as deployments.

Must understand the OSI Model, TCP/IP, VLANs, UDP Multicast.

Must have firewall configuration knowledge such as Juniper, Cisco, Palo Alto.

Must have knowledge of ACL design and function.

Must have hands on experience with multi-vendor switching/routing (Juniper, Cisco).

Must be an effective communicator with excellent writing and presentation skills using Microsoft PowerPoint and Visio drawing tools.

Must be able to design security configurations and testing procedures.

Must be familiar with NIST CVE framework.

Must have experience with virtualization.

Must be able to work collaboratively in a team environment with other highly motivated network and system engineers.

Intermediate knowledge of security design, development, and testing methodologies.

Experienced in application of standard DOD security practices such as, STIG compliance and system accreditation implementation efforts.

Able to thoroughly document project design and development efforts.

Able to collaborate with other departments to explain network security requirements and compliance.

Able to learn security hardening basics for wide range of niche products, software and applications.

Able to summarize, brief, and recommend solutions to security issues to leadership.

Understand basics of VMware and ESXi STIGing/Hardening

Must know about STIG Compliance and POAMS.

# years required 3-5

Scripting knowledge Python, Ansible, PowerShell (Desired)

Solid understanding of JUNOS (Desired)

Prior C2BMC experience (Desired)

Role Description:

In this role the candidate will be responsible for providing technical support for the assessment of compliance of information systems with DoD RMF standards (review, verify and validate required DoD IA RMF documentations and artifacts using DoDI 8510.01/DoD Risk Management Framework). Candidate must have proven experience in developing Cyber-secure Network device configurations (Firewalls, switches, routers).

Responsibilities:

Candidate will be a primary Network Security Engineer supporting the C2BMC Program.

Candidate will be responsible for planning, deploying, integrating, and testing upgrades to the C2BMC network to operational sites.

Candidate will be required to conduct research on different networking and security related topics independently and produce reports on findings.

Candidate will be required to make sure that the teams’ devices are STIG's and hardened appropriately. Along with running all Cyber protocols needed.

  • Please respond with the word BLUE to [email protected] if you can interested**

Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6 months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Apex team member can provide.

EEO Employer

Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Employee Services Department at [email protected] or 844-463-6178.

Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico.

Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6 months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Apex team member can provide.

Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico.

Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6 months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Apex team member can provide.

Apex Systems is part of the Commercial Segment of ASGN Incorporated.

NYSE: ASGN

4400 Cox Road

Suite 200

Glen Allen, Virginia 23060

Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Employee Services Department at [email protected] (Do not submit resumes or solicit consultants to this email address). UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Apex Systems.

Salary : $65 - $75

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