Senior Network Security Engineer Jobs
Senior Network Security Engineer jobs are open across financial services, healthcare, defense, technology, and critical infrastructure, at every level from mid-level to principal and distinguished engineer, with specializations in zero-trust architecture, cloud security, and threat detection. Find a role that fits from the openings below and apply directly.
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Showing 5 of 279+ Senior Network Security Engineer jobs
Description
Computer Network Defense (CND) Security Engineer
Suitland, MD
Leidos is hiring a Computer Network Defense (CND) Security Engineer to join our team in Suitland, MD. In this role, you will help protect critical Department of Defense networks by monitoring and analyzing security events, investigating cyber threats, performing vulnerability management activities, and supporting advanced cybersecurity technologies across Windows, Linux, and VMware environments. This is an opportunity to work on mission critical systems while collaborating with a highly skilled cyber team.
Primary Responsibilities
- Monitor and analyze security events using Trellix ePO, Splunk, Palo Alto, and RSA.
- Investigate endpoint security alerts, including malware, rogue systems, and removable media events.
- Build dashboards, perform ACAS scans, and assist with vulnerability remediation efforts.
- Apply STIGs, perform system patching, and manage SCAP scans.
- Contribute to RMF documentation and maintain system and network diagrams.
Basic Qualifications
- Bachelor's degree with 8+ years of experience, or a Master's degree with 6+ years of experience. Additional relevant experience or certifications may be considered in lieu of a degree.
- Active TS/SCI clearance (in DISS).
- Active IAT Level II certification (CompTIA Security+ CE preferred).
- Linux administration experience, specifically with Red Hat Enterprise Linux (RHEL).
- 3+ years of Computer Network Defense (CND) experience.
- Experience administering enterprise scale vulnerability management systems, including deploying multi scanner architectures with Tenable Security Center (Tenable.sc) and Nessus Manager.
- Experience managing credentialed scans, performing offline plugin updates in air gapped environments, and deploying Nessus Agents at scale across diverse endpoints.
- Hands on experience with Splunk, Trellix ePO, ACAS, and RMF.
Preferred Qualifications
- Experience with VMware ESXi.
- Experience with ACAS and Nessus.
If you're looking for an opportunity to help defend critical national security systems while working with advanced cybersecurity technologies, we'd love to hear from you.
DABAOPP1
NITESONI
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:
July 31, 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 - $195,050.00The 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.
About Leidos
Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com.
Pay and Benefits
Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits.
Securing Your Data
Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system – never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com.
If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.
Commitment to Non-Discrimination
All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.
Description
Computer Network Defense (CND) Security Engineer
Suitland, MD
Leidos is hiring a Computer Network Defense (CND) Security Engineer to join our team in Suitland, MD. In this role, you will help protect critical Department of Defense networks by monitoring and analyzing security events, investigating cyber threats, performing vulnerability management activities, and supporting advanced cybersecurity technologies across Windows, Linux, and VMware environments. This is an opportunity to work on mission critical systems while collaborating with a highly skilled cyber team.
Primary Responsibilities
- Monitor and analyze security events using Trellix ePO, Splunk, Palo Alto, and RSA.
- Investigate endpoint security alerts, including malware, rogue systems, and removable media events.
- Build dashboards, perform ACAS scans, and assist with vulnerability remediation efforts.
- Apply STIGs, perform system patching, and manage SCAP scans.
- Contribute to RMF documentation and maintain system and network diagrams.
Basic Qualifications
- Bachelor's degree with 8+ years of experience, or a Master's degree with 6+ years of experience. Additional relevant experience or certifications may be considered in lieu of a degree.
- Active TS/SCI clearance (in DISS).
- Active IAT Level II certification (CompTIA Security+ CE preferred).
- Linux administration experience, specifically with Red Hat Enterprise Linux (RHEL).
- 3+ years of Computer Network Defense (CND) experience.
- Experience administering enterprise scale vulnerability management systems, including deploying multi scanner architectures with Tenable Security Center (Tenable.sc) and Nessus Manager.
- Experience managing credentialed scans, performing offline plugin updates in air gapped environments, and deploying Nessus Agents at scale across diverse endpoints.
- Hands on experience with Splunk, Trellix ePO, ACAS, and RMF.
Preferred Qualifications
- Experience with VMware ESXi.
- Experience with ACAS and Nessus.
If you're looking for an opportunity to help defend critical national security systems while working with advanced cybersecurity technologies, we'd love to hear from you.
DABAOPP1
NITESONI
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:
July 31, 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 - $195,050.00The 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.
About Leidos
Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com.
Pay and Benefits
Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits.
Securing Your Data
Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system – never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com.
If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.
Commitment to Non-Discrimination
All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.
Senior Network Security Engineer Jobs by Experience Level
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Find JobsSenior Network Security Engineer Job Market
Who's Hiring
Top Industries Hiring
- Technology & Software36
- Investment & Asset Management8
- Consulting & Professional Services8
- Electronics & Hardware7
- Accounting & Auditing5
What Employers Look For
The qualifications that appear most often in senior network security engineer jobs.
- Seven or more years of hands-on network security engineering experience in enterprise or critical infrastructure environments
- Deep expertise in firewalls, intrusion detection and prevention systems, and network access control tools
- CISSP, CCNP Security, or CCIE Security certification is strongly preferred or required
- Experience designing and implementing zero-trust network architecture and microsegmentation strategies
- Proficiency with SIEM platforms such as Splunk, Microsoft Sentinel, or IBM QRadar for threat monitoring
- Bachelor's degree in computer science, cybersecurity, information systems, or a closely related field
Tips for Your Senior Network Security Engineer Job Search
Align your resume to each job
Generic resumes lose out at this level. Mirror the exact stack each posting names, whether that's Palo Alto, Cisco Firepower, or SASE platforms, and lead with measurable outcomes like network segments hardened or incidents reduced, not just job duties.
Earn certifications that clear automated screens
CISSP, CCIE Security, and CCNP Security appear as hard filters in most applicant tracking systems for senior roles. If you hold one but not the others, list it prominently and note active pursuit of the next certification so screeners don't filter you out early.
Apply early to roles that fit
Migrate Mate lists senior network security engineer openings from across the United States in one place, so you can find roles that match and apply directly to each listing.
Target roles by the security domain you own
Search by domain, not just title. Cloud network security, OT and ICS security, and zero-trust implementation are distinct hiring tracks. Filtering for your strongest domain surfaces roles where your experience reads as a direct match rather than a partial fit.
Prepare a threat-scenario walk-through for interviews
Senior-level technical screens routinely ask you to architect a defense against a specific attack vector or post-breach scenario. Prepare two or three walk-throughs using a recent real-world incident type, covering detection, containment, and remediation steps in your preferred toolchain.
Negotiate scope before accepting an offer
At the senior level, titles and compensation vary widely based on whether you own architecture decisions, manage a team, or carry an on-call rotation. Clarify these responsibilities before accepting so your day-to-day matches what you agreed to.
Senior Network Security Engineer Jobs: Frequently Asked Questions
Which companies are hiring the most senior network security engineers?
The companies hiring the most senior network security engineers right now include Deloitte, Palo Alto Networks, and Koch, with the largest share of openings in California, Texas, and Virginia, based on current listings on Migrate Mate as of August 2026. Defense contractors, major financial institutions, and large cloud providers consistently post the highest volume of senior-level openings.
How many senior network security engineer jobs are remote?
About 54% of senior network security engineer openings are fully remote or hybrid as of August 2026, though roles tied to classified environments or on-premises infrastructure typically require on-site presence. Cloud network security and threat detection roles are the most likely to offer fully remote arrangements, while OT, ICS, and government-adjacent positions almost always require a physical location.
How do you become a senior network security engineer?
Start with a foundation in networking, earning certifications like CompTIA Network+ and then CCNA before moving into security-specific credentials such as CCNP Security or CISSP. Build hands-on experience across firewall management, vulnerability assessment, and incident response. Progress through network security analyst or engineer roles, take on architecture responsibilities, and develop fluency in at least one major SIEM and cloud security platform before targeting senior openings.
Can I get hired as a senior network security engineer without direct senior-level experience?
It's possible if your mid-level experience directly overlaps with senior responsibilities. Candidates who have owned firewall architecture decisions, led a significant network segmentation project, or served as the de facto senior engineer on a small team often qualify. A strong CISSP or CCIE Security credential can offset a gap in title history, especially at organizations that weight demonstrated technical depth over years of service.
What does the senior network security engineer interview process look like?
Most processes start with a recruiter screen focused on your domain experience and certification status, followed by a technical phone or video interview covering network protocols, firewall logic, and threat modeling. A hands-on or whiteboard exercise asking you to design a secure network segment or respond to a simulated breach scenario is common at the senior level. Final rounds typically include a panel with the security architecture or engineering leadership team.
Where can I find and apply to senior network security engineer jobs?
You can find and apply to senior network security engineer jobs on Migrate Mate, which lists current openings from across the United States. Search the listings to find roles that match your domain expertise, seniority level, and preferred work arrangement, then apply directly to each listing that fits.
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