Senior Information Systems Security Officer ISSO

Leidos; Maryland; On-site; USD 131,000 - 237,000; Full time

Benefits offered by this job

Sign-on bonus $15k

Competitive benefits

Job summary

Leidos in Maryland seeks a Senior Information Systems Security Officer (ISSO) to secure large-scale collection systems aboard a multi-year program at Annapolis Junction. The role focuses on implementing and maintaining robust security measures, compliance with RMF and DoD processes, and collaboration with customer teams.

The ideal candidate has DoD 8570 IAM Level II or IAT Level III, TS/SCI with Polygraph, 12+ years of ISSO experience, and proven ability to develop security documentation such as

Qualifications

• Bachelor's degree in Computer Science, Information Assurance, Information Security, or related field with 12+ years of experience.
• 7+ years ISSO experience supporting IC or DoD programs of similar scope and complexity.
• Experience with customer Info Security tool suite and compliance processes.

Responsibilities

• Enhancing security posture by IA initiatives and enforcing security policies and methodologies.
• Overseeing security operations for information systems and conducting vulnerability and risk assessments.
• Managing configuration management for security software, hardware, and firmware.
• Developing and maintaining SSPs, Risk Assessment Reports, C&A packages, and SRTMs.
• Ensuring RMF and DoD Certification and Accreditation processes are followed.
• Providing technical expertise in security policies and collaborating with stakeholders.

Skills

ISSO experience

Security policy

Vulnerability assessment

RMF & DoD

TS/SCI with Polygraph

Education

Bachelor's degree in CS/Info Assurance

4 years experience in lieu of degree

Tools

Info Security Tool Suite

Job description

Leidos has a new and exciting opportunity for a Senior Information Systems Security Officer (ISSO) in our Intelligence Sector, Cyber & Analytics Business Area (CABA). Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos , we offer competitive benefits Leidos Pay and Benefits, including 4 or more weeks Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immediate vesting, Flexible Schedules, Discounted Stock Purchase Plans, Technical Upskilling, Education and Training Support, Parental Paid Leave, and much more. Join us and make a difference in National Security!

This position is eligible for a 15k sign on bonus!

Job Summary:

The Senior ISSO plays a vital role in securing and maintaining the integrity of our information systems through robust security measures and compliance frameworks. This multi-year, high-impact program supports our customer site in Annapolis Junction, MD, focusing on the development, integration, deployment, and sustainment of cutting-edge large-scale collection systems.

As part of this mission-critical contract, you will have the opportunity to work independently, innovate with emerging technologies, and contribute directly to national security. If you’re passionate about solving complex security challenges and making a tangible impact, this is the role for you. Your greatest work is ahead!

Responsibilities Include:

• Enhancing security posture by supporting the program, organization, system, or enclave’s information assurance initiatives and enforcing security policies, standards, and methodologies.

• Overseeing security operations for information systems, managing daily security aspects, evaluating security solutions for classified processing, and conducting vulnerability and risk assessments for accreditation.

• Managing configuration and system integrity by administering configuration management (CM) for security software, hardware, and firmware, ensuring compliance with security controls, and assessing the impact of system changes.

• Developing and maintaining security documentation , including System Security Plans (SSPs), Risk Assessment Reports, Certification & Accreditation (C&A) packages, and System Requirements Traceability Matrices (SRTMs).

• Ensuring compliance with security authorization activities following the Information System Certification and Accreditation Process (NISCAP) and DoD Risk Management Framework (RMF).

• Providing technical expertise in security policies and operations, supporting the implementation and maintenance of security measures, and collaborating with stakeholders to strengthen the security posture.

• Driving continuous improvement by assessing existing security processes, identifying vulnerabilities, and implementing proactive solutions to enhance system resilience.

Basic Qualifications:

• Bachelor of Science degree in Computer Science, Information Assurance, Information Security, or a related discipline, plus 12+ years of relevant experience. In lieu of a degree, an additional 4 years of experience may be considered on a case by case basis.

• Industry Expertise: 7+ years of ISSO experience supporting IC or DoD programs and contracts of similar scope, type, and complexity.

• Experience with customer Info Security tool suite

• Certifications & Compliance: DoD 8570 compliance with IAM Level II or IAT Level III (CASP, CISSP, or Associate).

• Clearance Requirement: Must hold an active TS/SCI with Polygraph.

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:

August 5, 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 $131,300.00 - $237,350.00

The Leidos pay range for this job level is a general guideline onlyand 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.