Sr. ISSO TS/SCI Polygraph

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

Benefits offered by this job

PTO

11 holidays

401k 6% match

Flexible schedules

Job summary

Leidos is seeking a Senior Information System Security Officer (ISSO) to support a large software development program at the Annapolis Junction, MD site. The ISSO will work with security professionals to implement strategies that detect and mitigate threats and protect critical data across information systems and networks.

Qualifications include a bachelor’s degree with 12+ years of relevant experience and TS/SCI with polygraph clearance; DoD 8570 IAT II and IAM II compliance are preferred.

Qualifications

• Bachelor's degree required; 12+ years of relevant experience preferred.
• DoD 8570 IAT II and IAM II compliance preferred.
• TS/SCI with polygraph clearance required.

Responsibilities

• Provide support for implementing and enforcing information systems security policies, standards, and methodologies.
• Assist in evaluation of security solutions to meet requirements for processing multiple types of information.
• Assist with Configuration Management for information system security software, hardware, and firmware.
• Analyze threats and develop best practice methodologies for incident detection, reporting, and remediation.
• Maintain records on hardware and network devices to include system upgrades and configurations.
• Develop and update system security plans and IA documentation and provide support for IAVA management.

Skills

TS/SCI with polygraph

ISSO experience

IAVA management

SSP development

Security assessments

Security policy

Independent work

Education

Bachelor's degree in a related field

Tools

Security tools

Encryption techniques/tools

Configuration management tools

Job description

Leidos has a new and exciting opportunity for a Senior Information System Security Officer in our INTEL 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, including 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!

Senior Information System Security Officer (ISSO) Leidos currently has an opening for a Senior Information System Security Officer (ISSO) to work at our Annapolis Junction, MD location.

The selected candidate will act as an ISSO for a large software development program which includes software maintenance and development, IT support (Network/Workstation/Server), systems integration and life cycle support, enterprise application development, network engineering, and information systems security (ISS). The candidate will work with other security professionals in developing and implementing strategies to detect and mitigate threats to information systems, protect critical data sets, and provide assessments of system and network vulnerabilities.

Primary Roles and Responsibilities

• Provide support for implementing and enforcing information systems security policies, standards, and methodologies.
• Assist in the evaluation of security solutions to ensure they meet security requirements for processing multiple types of information.
• Assist with the Configuration Management for information system security software, hardware, and firmware.
• Analyze threats and develop and implement best practice methodologies for incident detection, reporting, and vulnerability remediation.
• Maintain records on workstations, servers, routers, firewalls, intelligent hubs, network switches, etc. to include system upgrades.
• Evaluate security solutions to ensure they meet security requirements for processing information.
• Maintain operational security posture for information systems.
• Provide support to the Information System Security Manager (ISSM) for maintaining the appropriate operational IA posture for a system/program/enclave.
• Develop and maintain documentation for Certification & Accreditation in accordance with specified policies.
• Develop and update system security plans and other IA documentation.
• Provide support for Information Assurance Vulnerability Alerts (IAVAs) management (initiating IAVA responses and system security scans, completing remediation, extending IAVA patches and security updates to designated sites, etc.).
• Provide CM for security-relevant information system software, hardware, and firmware.
• Develop system security policy and ensure compliance.
• Administer the user identification and authentication mechanisms of the Information System.

Basic Qualifications

• Bachelor’s degree in a related field and at least 12 years of relevant experience.
• Additional experience may be substituted for a degree.
• TS/SCI with polygraph security clearance.
• Must have at least 10 years of experience as ISSO working independently, and/or on teams maintaining secure information system operations in isolated, connected and standalone environments.
• Must have at least 5 years of experience using tools to support IAVA management.
• Must have at least 5 years of experience using tools to support the preparation, maintenance, and management of SSPs and other security related documentation.
• Demonstrated knowledge of and experience with several of the following: current security tools; hardware/software security implementation; communication protocols; encryption techniques/tools.
• In-depth experience completing security evaluations of software systems or architectures to ensure they meet security requirements.
• In-depth experience proposing, coordinating, implementing, and enforcing information systems security policies, standards, and methodologies, preferably on a large software or IT program.
• Demonstrated experience performing day-to-day security operations of large, complicated information and information processing systems.
• Must be committed to developing and adhering to best practices.
• Must possess a high level of self-initiative and must be a solutions-oriented team player.
• Must have excellent interpersonal skills.

Preferred Qualifications

• Extensive experience as an Information Systems Security Officer on large software development and integration programs.
• DoD 8570 compliance with IAT Level II or higher.
• DoD 8570 compliance with IAM Level II or higher.

At Leidos, the opportunities are boundless. We challenge our staff with interesting assignments that allow them to thrive professionally and personally. For us, helping you grow your career is good business.

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 that 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 15, 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 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.

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 $17.2 billion for the fiscal year ended January 2, 2026. 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 here.

Securing Your Data Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to [e-mail].

Commitment and Diversity

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.