Leidos is seeking an Information Systems Security Engineer (ISSE) for a technical development program supporting cloud-based applications, and its associated cloud infrastructure located on a highly secure network. The ISSE will work with a large team of developers, system engineers, DevOps engineers, database administrators, and system architects.
Core business hours for the team are from 9 AM to 3 PM daily – exceptions outside of those hours for the candidate may be negotiated in consultation with management.
The typical day for an ISSE supporting the cloud-based applications is as follows:
The ISSE will participate in the team’s regularly scheduled Agile tag up (scrum) meetings and report on the status of their assigned Jira issues
Attend ad-hoc TEMs with the team to discuss and weigh in on numerous architectural aspects of the systems for assessing security impacts that may arise with system changes
Assist with and/or lead security scans of the systems and report and analyze findings for impacts
Review any security findings (CVEs) as noted by outside entities for system impact analysis and how best to proceed with addressing them
Participate in team TEMs and review future system changes/new features for security impacts
Primary Responsibilities
Identifying, selecting, implementing and assessing NIST SP 800-53 security and privacy controls.
Developing, establishing and integrating secure configuration baselines per DISA STIGs and CIS benchmark guidelines
Participate in creating secure architectures and designs
Ensuring security requirements are integrated into the System/Software Development life cycle (SDLC).
Performing Continuous Monitoring (ConMon) activities to support Assessment and Authorization (A&A) requirements
Reviewing, creating and maintaining relevant Assessment and Authorization (A&A) artifacts
Performing security analysis and monitoring of a 100 percent AWS, cloud-based system
Performing vulnerability scanning and analysis of the system
Perform remediation and develop security implementations based on security findings
Interface with Information System Security Managers (ISSM) to develop and accredit the system
Participate in or lead technical exchange meetings, document meeting outcomes as needed, and brief management
Required Qualifications
Bachelor's degree and 12+ years of experience. Additional experience in lieu of degree.
Active TS/SCI with Polygraph
Other qualifications:
Hands on experience with Linux (CLI)
Hands on experience with scripting and programming languages like BASH and Python
Solid understanding of, experience with networking (e.g., ports, routing tables, subnets, VPNs, firewalls, routers, etc.) to include design, integration and troubleshooting issues
Experience in working on teams utilizing Agile workflows and processes
Strong understanding of NIST SP 800-37, NIST SP 800-53, NIST SP 800-160, DISA/CIS STIGs, and Common Vulnerabilities and Exposures (CVEs)
Experience with RMF workflow tools
Strong communication, organizational, and writing skills.
Must be able to clearly and directly articulate their findings and recommendations.
Must be open minded to considering alternative approaches to possible security issues noted by other team members
Desired Qualifications
Relevant IT certifications (e.g., CISSP, AWS Cloud Practitioner, AWS Cloud Security, AI security, etc.)
Experience working with Infrastructure as Code (IaC) solutions such as Ansible / Terraform, or other configuration and automation tools
Experience in working in a cloud-based environment (AWS)
FIP
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.
May 23, 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 $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 is a Fortune 500® innovation company rapidly addressing the world’s most vexing challenges in national security and health. The company's global workforce of 48,000 collaborates to create smarter technology solutions for customers in heavily regulated industries. Headquartered in Reston, Virginia, Leidos reported annual revenues of approximately $15.4 billion for the fiscal year ended December 29, 2023.
Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®.
Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos.
Your most important work is ahead, visit careers.leidos.com for our latest opportunities.
