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Principal Engineer - Security AI
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Software Development Engineer (Database) Early Career- 2027 (US)
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Summer 2027 Intern - Forward Deployed Engineer - Global Public Sector
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AI Developer
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AI Developer
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AI Developer
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AI Developer
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Sr. Systems Engineer – Mainframe API Services
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As a Software Engineer II, your code will serve high-traffic, global applications while you gain deep expertise in large-scale system design, performance engineering, and emerging…
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Security Engineer
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Lead Security Engineer - Java Full Stack
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Leidos

IASE / ISSE

Suitland, MD, United States

Pay Range $107,900.00 - $195,050.00

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Job details

Pay: Pay Range $107,900.00 - $195,050.00
Posting language: English
Posted: Sep 15, 2026

Original job description

Description

Information Assurance Security Engineer (IASE) / Information Systems Security Engineer (ISSE)

Location: Suitland, MD

Clearance: Active TS/SCI

Leidos is hiring a hands-on Information Assurance Security Engineer (IASE) / Information Systems Security Engineer (ISSE) to support a complex, mission-driven enterprise environment in Suitland, MD .

In this engineering-focused role, you will actively secure, administer, harden, and maintain critical systems and infrastructure while collaborating across network, systems, cybersecurity, and architecture teams to continuously strengthen and evolve the organization’s overall security posture. You will combine deep technical security expertise with hands on engineering, vulnerability remediation, security testing, and architecture support to help protect mission critical systems and capabilities.

This role is open to candidates across a range of experience levels. The scope of the position and corresponding compensation will be aligned with the selected candidate’s background and expertise.

Primary Responsibilities

Serve as a primary security engineering resource for enterprise infrastructure, providing hands on administration, configuration, security hardening, troubleshooting, and vulnerability remediation.
Research and evaluate cybersecurity tools, technologies, and methodologies to identify opportunities to strengthen enterprise security.
Participate in architecture and engineering reviews and provide security recommendations for new capabilities, technologies, and infrastructure changes.
Troubleshoot complex security issues across storage, networking, operating systems, authentication, and enterprise infrastructure.
Conduct vulnerability assessments, ethical hacking, and penetration testing to identify and address security risks.
Review and harden storage protocols and services, including NFS, SMB/CIFS, iSCSI, and management interfaces, based on operational and security requirements.
Apply and validate applicable DISA Security Technical Implementation Guides (STIGs), Security Requirements Guides (SRGs), vendor security guidance, and industry security best practices.
Configure and maintain secure administrative access using technologies and principles such as SSH, HTTPS/TLS, role based access control (RBAC), centralized authentication, and least privilege.
Develop and deliver training on cybersecurity tools, technologies, and processes.

Required Qualifications

Bachelor’s degree in Cybersecurity, Electrical Engineering, Information Technology, Information Assurance, or a related field with 8+ or 12+ years of experience; Master’s degree with 6+ or 10+ years of experience. Additional relevant experience may be considered in lieu of a degree.
Active TS/SCI clearance in DISS and required program access.
8+ years of security engineering experience, including experience with DoD RMF, ICD 503, and/or the NIST Risk Management Framework.
Extensive experience with Intelligence Community (IC), Department of Defense (DoD), Defense Information Systems Agency (DISA), NAVINTEL Cybersecurity, Fleet Cyber Command (FLTCYBERCOM), and DoDIIS processes, tools, systems, reporting mechanisms, and requirements supporting Assessment and Authorization (A&A).
5+ years of software development experience using Java, C, C++, or other programming or scripting languages, including experience designing and developing host based and network based scanning tools.
Experience with Security Content Automation Protocol (SCAP) based tools and specifications.
Experience installing, configuring, testing, deploying, operating, and maintaining enterprise network based scanning and reporting tools such as Trellix/ESS, ACAS, RedSeal, Evaluate STIG, SteelCloud ConfigOS, and STIG Manager.
Extensive experience hardening modern Unix operating systems, such as Oracle Solaris 10/11 and RHEL, as well as Microsoft Windows environments using Security Technical Implementation Guides (STIGs).
Extensive experience securing systems and software in accordance with IC, DoD, and industry security best practices.
Experience developing security controls, testing methodologies, and test procedures for systems, cloud based architectures, and Cross Domain Solutions (CDS).
2+ years of project management experience.
Demonstrated ability to take a proactive, results oriented approach while building effective customer and team relationships.

Required Certifications

Active IAT or IAM Level II/III DoD 8140 approved baseline certification, such as CISSP ISSEP or SecurityX, or the ability to obtain the required certification within 30 days of hire.

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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:

September 14, 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 $107,900.00 - $195,050.00

The Leidos pay range for this job level is a general guideline onlyand 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.

About 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 $16.7 billion for the fiscal year ended January 3, 2025. 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 at www.leidos.com/careers/pay-benefits .

Securing Your Data

Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system – never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com .

If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission (https://reportfraud.ftc.gov/#/) .

Commitment to Non-Discrimination

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.

REQNUMBER: R-00192203

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. Leidos will consider qualified applicants with criminal histories for employment in accordance with relevant Laws. Leidos is an equal opportunity employer/disability/vet.

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