Senior Network Defense Design Engineer at Leidos

Unleash Your Potential

At Leidos, we deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customer’s success. We empower our teams, contribute to our communities, and operate sustainably. Everything we do is built on a commitment to do the right thing for our customers, our people, and our community. Our Mission, Vision, and Values guide the way we do business.

If this sounds like an environment where you can thrive, keep reading!The Mission

The Leidos team delivers the core backbone of the Service, Management, Integration and Transport (SMIT) program, including cybersecurity services, network operations, service desk, and data transport. Leidos will support network modernization efforts to provide Sailors, Marines and the civilian workforce with the tools they need to be more efficient at increasing naval capabilities and further empowering the Navy Marine Corps team to compete and win.

Your Main Objective

• Assist the Government Lead in the daily engineering duties on systems. Operate and manage all aspects of Information Systems, data availability, integrity, authentication, confidentiality, and non-repudiation. Implement and monitor security measures for communication systems, networks, and provide advice that systems and personnel adhere to established Government security requirements.

• Develop and execute security policies, plans, and procedures.

• Develop Continuity of Operations Plan/Disaster Recovery (COOP/DR) plans and support certification of Information Systems and Networks.

• Operate and Design Enterprise solutions for Logging, Forensics, Security Incident and Event Management (SIEM), and Design Network Access Control (NAC).

• Design and implement the Enterprise Services portion of the Sensor Grid within the security infrastructure that collects intrusion, incident, and audit data from a collection of sources including, but not limited to, Content Monitoring products, Content Filtering products, Host Based Security System (HBSS) for servers and hosts with the capability for packet capture, deep inspection, and customized signature capability.

• Design and implement HW sensors into the Navy/Marine Corps architecture for on-call and future CND tools.

• Design, plan, and implement actions on the enterprise as required by each of the Cyber Readiness Conditions.

• Design and integrate Computer Network Defense (CND) mechanisms, including anti-spam tools, Network Access Control, HBSS, and HBSS Device Control Modules at Enterprise locations.

• Assist with the development and integration of identity and access management requirements.

• Execute Project Management tasks such as developing a Plan of Actions and Milestones (POA&M) for system compliance.

• Monitor and optimize replication speed of directory services.

• Oversee Rights Management Services for administrators, users and groups.

• Perform tasks associated with application networking ports and protocols, Information Assurance (IA), routing and Local Area Network (LAN).

• Perform integration with Public Key Infrastructure (PKI) certificates and network accounts to support two-factor authentication for all Active Directory (AD) domain account categories and eliminate the need for password-based authentication.

• Administer intrusion prevention.

• Perform Backup (Disaster Recovery).

• Perform integration tasks using Mc Afee IPS and Mc Afee SIEM.

What Sets You Apart

• Bachelor's Degree in Computer Science, MIS, Business, or related field

• 10 years of related experience

• Must possess and Information Assurance Technician (IAT) Level III

• Must possess an Information Technology Infrastructure Library (ITIL)

• US Citizen with an active Do

D Secret Security Clearance:

NGEN

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Original Posting:

May 4, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:

Pay Range $107,900.00 - $195,050.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.