Information Systems Security Officer

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

Job summary

Leidos LLC is seeking an Information Systems Security Officer (ISSO) to support critical national-security missions in a secure on-site environment. You will help maintain the security posture, support accreditation activities, and collaborate with ISSMs, system administrators, and mission teams.

The role requires a Bachelor's degree or 15 years of ISSO experience, TS/SCI with Polygraph, and full-time on-site work.

Qualifications

• Bachelor’s degree in Computer Science or related discipline or 4 years of ISSO experience in lieu of degree.
• 15 years of ISSO experience on programs/contracts of similar scope and complexity.
• Experience in at least two areas: security tools, encryption, IAM, or DoD 8570 IAM Level I or higher.
• Experience with information-system security policies, standards, and day-to-day operations.
• Active TS/SCI clearance with Polygraph; on-site work required.

Responsibilities

• Maintain operational security posture of information systems and programs.
• Support security policies, standards, and methodologies implementation.
• Coordinate IT security programs and develop system security policies.
• Assist ISSM in maintaining appropriate IA posture for systems and enclaves.
• Support security authorization, certification, and accreditation activities.

Skills

ISSO experience

Information Security

NIST RMF knowledge

Vulnerability assessment

Policy development

Education

Bachelor’s degree in Computer Science or related discipline

Tools

ServiceNow

C&A documentation tools

Job description

Job Description Job Description Information Systems Security Officer (ISSO) Leidos – Cyber & Analytics Business Area, Key Management & Analytics Division, Your Experience. A Critical Mission. Real Impact. Leidos has an exciting opportunity for an experienced Information Systems Security Officer (ISSO) to join our Cyber & Analytics Business Area, Key Management & Analytics Division, supporting critical national-security missions. You'll help protect the systems and information our customers depend on—supporting information assurance, security operations, system accreditation, configuration management, and the security posture of mission-critical information systems. Working alongside ISSMs, senior ISSOs, system administrators, engineers, and mission teams, you'll help ensure systems remain secure, compliant, documented, and ready to support the mission. This is a full-time, on-site position in a secure mission environment. Due to the nature of the work and security requirements, remote work is not available for this position. If you have deep information-assurance and cybersecurity experience and want to apply that expertise to work that directly supports national security, we’ll talk.

What You'll Do

As an ISSO, you’ll help maintain the operational security posture of information systems and programs while ensuring applicable security policies, standards, and methodologies are implemented and followed.

• Support senior ISSOs in implementing and enforcing information systems security policies, standards, and methodologies.
• Plan and coordinate IT security programs and policies and help develop system security policies that ensure compliance.
• Support the Information System Security Manager (ISSM) in maintaining the appropriate operational Information Assurance (IA) posture for systems, programs, and enclaves.
• Evaluate security solutions to ensure they meet requirements for processing classified information.
• Perform vulnerability and risk-assessment analysis in support of certification and accreditation activities.
• Develop, maintain, and update security documentation, including System Security Plans (SSPs), Risk Assessment Reports, Certification and Accreditation (C&A) packages, System Requirements Traceability Matrices (SRTMs), and other required IA documentation.
• Develop and maintain C&A documentation in accordance with applicable ODNI and DoD policies and support obtaining C&A for information systems under your purview.
• Support security-authorization activities in accordance with the National Institute of Standards and Technology Risk Management Framework (NIST RMF).
• Manage and control system changes, evaluate their security impact, and provide Configuration Management (CM) for security-relevant information-system software, hardware, and firmware.
• Maintain records for workstations, servers, routers, firewalls, intelligent hubs, network switches, and other system components, including system upgrades.
• Support day-to-day security operations and administer user identification and authentication mechanisms for Information Systems.
• Support customer transition to ServiceNow (SNOW).
• Serve as the Approval Authority for Information Systems under your control, as required by the program.

What You'll Bring

This position requires an experienced cybersecurity professional with demonstrated Information Systems Security Officer experience supporting programs and contracts of comparable scope, type, and complexity.

• Basic Qualifications: Bachelor’s degree in Computer Science or a related discipline from an accredited college or university. In lieu of degree, 4 years of direct experience as an ISSO may be substituted.
• Fifteen (15) years of experience as an ISSO on programs and contracts of similar scope, type, and complexity.
• Experience in at least two (2) of the following areas: Current security tools; Hardware/software security implementation; Communication protocols; Encryption techniques and tools; DoD 8570 Information Assurance Management (IAM) Level I certification or higher.
• Demonstrated experience with information-system security policies, standards, methodologies, security documentation, and day-to-day security operations.
• Experience assessing system changes and their potential security impact.
• Experience supporting security authorization, certification and accreditation, and information-assurance activities.
• Active TS/SCI clearance with Polygraph.
• Ability to work full-time on site in a secure environment.

Why This Opportunity

The systems you’ll help protect support critical national-security missions. Your work helps ensure those systems can securely process classified information, remain compliant with applicable security requirements, adapt safely as technology changes, and maintain the operational security posture the mission depends on.

Within Leidos’ Cyber & Analytics Business Area, Key Management & Analytics Division, you’ll work alongside professionals supporting sophisticated national-security capabilities in areas including Security Engineering, Computer Network Operations (CNO), Mission Software, Signals Intelligence (SIGINT), Cryptographic Key Management, and systems integration.

Your cybersecurity expertise helps enable their mission.

Why Leidos

At Leidos, you’ll work alongside talented technical and mission professionals solving complex challenges where cybersecurity is fundamental to mission success. You’ll have opportunities to continue developing your expertise while contributing to consequential national-security work and connecting with the breadth of technical capabilities and career opportunities across Leidos.

Eligible employees have access to a competitive benefits package that includes:

• Paid Time Off
• 11 paid holidays
• 401(k) with a 6% company match and immediate vesting
• Employee Stock Purchase Plan
• Technical upskilling and professional-development opportunities
• Education and training support
• Paid parental leave
• Additional health, wellness, and employee benefits

Pay Range

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.

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.

Company Overview

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.