Information Systems Security Engineer - Careers at Leidos
Leidos
Information Systems Security Engineer - Careers at Leidos
Job Description
Join Leidos as an Information Systems Security Engineer in Linthicum, MD
Leidos seeks a seasoned Information Systems Security Engineer (ISSE) to deliver onsite support for critical DoD programs. If you thrive in high-stakes environments, possess TS/SCI with Polygraph, and excel at securing complex networked enclaves, this role demands your expertise. We're not seeking comfort-seekers—we recruit disruptors who outpace the status quo.
Key Responsibilities
- Conduct technical security assessments of computing environments, identifying vulnerabilities, non-compliance, and mitigation strategies.
- Validate system security requirements, design IA architectures for multi-enclave environments with varying classifications.
- Integrate security into operational systems, enforce trusted relations, and support security planning/risk management.
- Review Certification & Accreditation (C&A) documentation for compliance.
- Brief senior DoD officials with confidence in prepared and ad-hoc settings.
Required Qualifications
- Bachelor’s in Computer Science, IA, or related + 7+ years ISSE/Network Engineer experience (4 extra years accepted sans degree).
- CASP+ OR CISSP required.
- Active TS/SCI with Polygraph.
- Expertise in NIST 800 Series, CNSSI 1253, DoD 8500; hands-on with routers, firewalls, IPS/IDS.
- Proven skills in vulnerability research, requirements gap analysis, and independent execution.
Why Leidos?
Work on mission-critical defense projects with a pay range of $107,900 - $195,050, influenced by experience and skills. Enjoy full-time onsite role in Linthicum, MD, with opportunities to innovate in cybersecurity. Leidos outthinks, outbuilds, and outpaces—join us to refuse failure.
Original posting: January 23, 2026. Positions open at least 3 days.
Locations
- Linthicum, Maryland, United States
Salary
107,900 - 195,050 USD / yearly
107,900 - 195,050 USD / yearly
* This is an estimated range based on market data and may vary based on experience and qualifications.
Skills Required
- CASP+ or CISSP certificationintermediate
- NIST SP 800 Series, CNSSI 1253, DoD 8500intermediate
- Network security components (routers, firewalls, IPS, IDS)intermediate
- System security requirements analysisintermediate
- Vulnerability assessment and mitigationintermediate
- Network protocols and architecturesintermediate
Required Qualifications
- Bachelor’s degree in Computer Science, IA, or related field + 7+ years ISSE/Network Engineer experience (or 11+ years without degree) (experience)
- Active TS/SCI with Polygraph clearance (experience)
- Strong technical writing and briefing skills for senior DoD officials (experience)
- Hands-on experience implementing security/network components (experience)
- Ability to work independently with minimal direction (experience)
Responsibilities
- Perform/review technical security assessments to identify vulnerabilities and recommend mitigations
- Validate/verify system security requirements and establish security designs
- Design/develop/implement IA and security systems for networked enclaves
- Assist in building security architectures and trusted relations among systems
- Assess/mitigate threats throughout program lifecycle and support C&A documentation
Benefits
- general: Competitive salary $107,900 - $195,050
- general: Comprehensive health, dental, and vision insurance
- general: 401(k) matching and retirement plans
- general: Professional development and certification reimbursement
- general: Mission-critical work with cutting-edge DoD programs
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Answer 10 quick questions to check your fit for Information Systems Security Engineer - Careers at Leidos @ Leidos.
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Information Systems Security Engineer - Careers at Leidos
Leidos
Information Systems Security Engineer - Careers at Leidos
Job Description
Join Leidos as an Information Systems Security Engineer in Linthicum, MD
Leidos seeks a seasoned Information Systems Security Engineer (ISSE) to deliver onsite support for critical DoD programs. If you thrive in high-stakes environments, possess TS/SCI with Polygraph, and excel at securing complex networked enclaves, this role demands your expertise. We're not seeking comfort-seekers—we recruit disruptors who outpace the status quo.
Key Responsibilities
- Conduct technical security assessments of computing environments, identifying vulnerabilities, non-compliance, and mitigation strategies.
- Validate system security requirements, design IA architectures for multi-enclave environments with varying classifications.
- Integrate security into operational systems, enforce trusted relations, and support security planning/risk management.
- Review Certification & Accreditation (C&A) documentation for compliance.
- Brief senior DoD officials with confidence in prepared and ad-hoc settings.
Required Qualifications
- Bachelor’s in Computer Science, IA, or related + 7+ years ISSE/Network Engineer experience (4 extra years accepted sans degree).
- CASP+ OR CISSP required.
- Active TS/SCI with Polygraph.
- Expertise in NIST 800 Series, CNSSI 1253, DoD 8500; hands-on with routers, firewalls, IPS/IDS.
- Proven skills in vulnerability research, requirements gap analysis, and independent execution.
Why Leidos?
Work on mission-critical defense projects with a pay range of $107,900 - $195,050, influenced by experience and skills. Enjoy full-time onsite role in Linthicum, MD, with opportunities to innovate in cybersecurity. Leidos outthinks, outbuilds, and outpaces—join us to refuse failure.
Original posting: January 23, 2026. Positions open at least 3 days.
Locations
- Linthicum, Maryland, United States
Salary
107,900 - 195,050 USD / yearly
107,900 - 195,050 USD / yearly
* This is an estimated range based on market data and may vary based on experience and qualifications.
Skills Required
- CASP+ or CISSP certificationintermediate
- NIST SP 800 Series, CNSSI 1253, DoD 8500intermediate
- Network security components (routers, firewalls, IPS, IDS)intermediate
- System security requirements analysisintermediate
- Vulnerability assessment and mitigationintermediate
- Network protocols and architecturesintermediate
Required Qualifications
- Bachelor’s degree in Computer Science, IA, or related field + 7+ years ISSE/Network Engineer experience (or 11+ years without degree) (experience)
- Active TS/SCI with Polygraph clearance (experience)
- Strong technical writing and briefing skills for senior DoD officials (experience)
- Hands-on experience implementing security/network components (experience)
- Ability to work independently with minimal direction (experience)
Responsibilities
- Perform/review technical security assessments to identify vulnerabilities and recommend mitigations
- Validate/verify system security requirements and establish security designs
- Design/develop/implement IA and security systems for networked enclaves
- Assist in building security architectures and trusted relations among systems
- Assess/mitigate threats throughout program lifecycle and support C&A documentation
Benefits
- general: Competitive salary $107,900 - $195,050
- general: Comprehensive health, dental, and vision insurance
- general: 401(k) matching and retirement plans
- general: Professional development and certification reimbursement
- general: Mission-critical work with cutting-edge DoD programs
Tags & Categories
Answer 10 quick questions to check your fit for Information Systems Security Engineer - Careers at Leidos @ Leidos.
Related Books and Jobs