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Description Leidos has a new and exciting opportunity for Principal Information Systems Security Engineer (ISSE) in our National Security Sector's (NSS) 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! Job Description:This role provides information security solutions compliant with the Risk Management Framework (RMF) and ICD 503 Security Accreditation control as part of an Agile team. Responsibilities include collaborating with the customer security organization to ensure RMF processes are followed, policy is translated to operational procedures, proper tools are leveraged in the DevSecOps CI/CD Pipeline, verification that security policy and procedures are enforced, and some work generating body of evidence (BOE) information for security approval processes. There may also be times when the ISSE will be asked to perform part time ISSO tasks. This role installs and maintains security scanning tools, performs security scans, reviews scan results, and supports information system security officers (ISSOs). Flexible cross-training to also provide systems engineering, software development, training, security, and testing is also desired.Primary Responsibilities:This role is responsible for protecting the organization's information and information systems from unauthorized access, use, disclosure, disruption, modification, perusal, inspection, recording and destruction. Duties include managing and enforcing security strategies and policies within established guidelines and assisting in the generation of BOE information. Cyber-Security and Compliance & Risk Management. Identify and define system security requirements. Design computer security architecture and develop detailed cyber security designs. Prepare and document standard operating procedures and protocols. Configure and troubleshoot security infrastructure devices. Develop technical solutions and new security tools to help mitigate security vulnerabilities and automate repeatable tasks in a consultative role.

Basic Qualifications: 5 years of system engineering or system administration Experience coordinating with RMF stakeholders (ISSMs, SCAs, etc.) in testing, documenting, and achieving accreditation of systems throughout the development process, and achieving operational acceptance. Conducts vulnerability routine scanning, provides formal and informal reports to IT team and tracks remediation efforts Proactively identify security flaws and vulnerabilities. Continuously review security bulletins and related news; stay apprised of current threats and trends. Track common vulnerabilities and exposures (CVE) based security threats and map to internal controls and remediation plans. Audit systems for secure configuration. Investigate and respond to cyber security incidents (system and/or network breaches, malware attacks) and implement forensic investigations. System & network security monitoring with security information event management tools. Participate in data and root cause analysis for each service impacting incident with all possible corrective actions for improvement. Performs other duties as assigned. At least 2 Certifications: CISSP, Splunk, Network+, Security+, OSCP, Windows, Cisco, CEH, Juniper, RHEL Requires BS degree and 12 or more years of prior relevant experience or Masters with 10 or more years of prior relevant experience. Will consider experience in lieu of a degree. Candidate must have an active TS/SCI with polygraph

Preferred Qualifications: Experiences with at least one vulnerability scanning tool (AWS Inspector, Rapid 7 Nexpose, AppDetective, WebInspect, OWASP etc.) Dynamic Application Security Testing (DAST) and Static Application Security Testing (SAST) Familiar with SEIM and Cloud Computing Technologies (AWS) Experience with Agile Software Development Experienced with HBSS, IDS/IPS, VPNs, DISA STIGs Experience with RHEL Experience with system health tools (AppDynamics, SolarWinds) Knowledge of potential attack vectors such as XSS, injection, hijacking, social engineering Splunk end user experience with knowledge of how to create Splunk Dashboards are a plus OS patching experience Linux command line experience Microsoft Windows experience Automation experience

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. We look forward to learning more about you - apply today.CABARESTONCome break things (in a good way). Then build them smarter.We're the tech company everyone calls when things get weird. We don't wear capes (they're a safety hazard), but we do solve high-stakes problems with code, caffeine, and a healthy disregard for "how it's always been done."Original Posting:July 31, 2025For 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 $126,100.00 - $227,950.00The 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.