Senior Information Security Engineer Security Clearance

Position: Senior Information Security Engineer with Security Clearance
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- Description 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, Dev Ops 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 (Con Mon) 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 8+ 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.

Original Posting:
March 10, 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…