Information Systems Security Engineer

leidos· 00100 LEIDOS, INC.
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📍 Linthicum, MDFull time💰 USD 108K–195K

About this role

Leidos is currently seeking an Information Systems Security Engineer to support our customer onsite.

The ISSE shall perform, or review, technical security assessments of computing environments to identify points of vulnerability, non-compliance with established IA standards and regulations and recommended mitigation strategies. This includes:

  • Validates and verifies system security requirements definitions and analysis and establishes system security design

  • Designs, develops, implements and/or integrates IA and security systems and system components including those for networking, computing and enclave environment to include those with multiple enclaves and with differing data protection/classification requirements

  • Builds IA into systems deployed to operation environments

  • Assist architects and systems developers in the identification and implementation of appropriate information security functionality to ensure uniform application of Agency security policy and enterprise solutions

  • Supports the building of security architectures

  • Enforces the design and implementation of trusted relations among external systems and architecture

  • Assesses and mitigates system security threats/risk throughout the program life cycle

  • Contributes to the security planning, assessment, risk analysis, risk management, certification and awareness activities for system and networking operations

  • Reviews C&A documentation, providing feedback on completeness and compliance of its content

CLEARANCE REQUIRED: Active TS/SCI with Polygraph.

Minimum requirements include:

  • Bachelor’s degree from an accredited university ideally in Computer Science, Information Assurance, Information Security System Engineering or related field with a minimum of 7+ years of experience as an Information Systems Security Engineer (ISSE) or Network Engineer on programs and/or contracts with the customer space. 4 additional years of experience in lieu of Technical Degree will be accepted.

  • CASP+ OR CISSP a firm requirement

  • Strong writing skills

  • Confidence and ability to present briefing to senior level DoD officials in both prepared briefings and/or in ad hoc discussions.

  • Additionally, the candidate must also possess the following knowledge, skills and abilities:

  • Should have working knowledge of security/ or network components, i.e. routers, firewalls, IPS, IDS, etc

  • Experience in identifying, researching, characterizing, and documenting security weaknesses related to operating systems, software applications, firmware, network hardware components, as well as network architecture design and documented policies and procedures. 

  • Experience developing and documenting system security requirements and conducting requirements gap analysis. 

  • Knowledge of, and practical experience with the NIST Special Publications 800 Series, CNSSI 1253, and DoD 8500.

  • Experience with network technologies and the ability to demonstrate knowledge of network protocols, communications systems and architectures

  • Should have significant hands on experience implementing security and/or network components, i.e. routers, firewalls, IPS, IDS, etc. 

  • Ability to work independently within a schedule and with little direction.

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:

June 29, 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.

Frequently Asked Questions

What is the salary for the Information Systems Security Engineer role at leidos?
The listed salary for this Information Systems Security Engineer position at leidos is USD 108K–195K. This is an Full time role.
Where is the Information Systems Security Engineer position at leidos located?
This Information Systems Security Engineer role at leidos is based in Linthicum, MD. The position is listed as on-site or hybrid. Check the full job description or apply directly to confirm the work arrangement.
Is the Information Systems Security Engineer role at leidos full-time or part-time?
This is listed as a Full time position. It is posted as a Information Systems Security Engineer role in the 00100 LEIDOS, INC. department at leidos.
Which team or department does the Information Systems Security Engineer at leidos belong to?
This Information Systems Security Engineer position is part of the 00100 LEIDOS, INC. department at leidos. See the full job description for more information about the team structure and responsibilities.
How do I apply for the Information Systems Security Engineer position at leidos?
Click the "Apply Now" button on this page. You will be redirected to leidos's official application portal hosted on workday where you can submit your application directly.
When was the Information Systems Security Engineer job at leidos posted?
This Information Systems Security Engineer position at leidos was posted on Jun 29, 2026. Apply as soon as possible — early applications are often reviewed first.
Information Systems Security Engineer
leidos · 💰 USD 108K–195K
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