March 10, 2026For 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.
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.
This role is responsible for securing web applications, cloud environments, networks, SaaS platforms, and enterprise systems while supporting day-to-day security operations and incident response activities. This position plays a key role in vulnerability management, detection engineering, cloud and application security, identity and access management, and continuous improvement of the company's overall security posture.
p>Certified Intrusion analyst (GCIAs), GIAC Certified Enterprise Defender (GCED), Certified Geographic Information Systems Professional (GISP), GIAC Certified Incident Handler (GCIH), Certified Information Systems Security Professional (CISSP), Certified Secure Software Lifecycle Professional (CSSLP), Certified Information Systems Auditor (CISA), and/or Security+ certification, Mainframe Technology, Programming language or languages (for example, Java, C/C++, NET, Rexx, Cobol, Powershell), SAP, Version control software (for example, Subversion, Git, Librarian), Working as a project or team lead, Writing SQL queries in a database platform (for example, Oracle, DB2, SQL Server). Bachelor's degree in Computer Science, Information Technology, or related field and 3 years'' experience in information technology within the past 7 years OR 5 years'' experience in information technology or related field within the past 7 years OR a Master''s degree in Computer Science, Information Technology, or related field.
li>Hands on engineering experience with: host and container hardening; Kubernetes security (RBAC/NetworkPolicies, PodSecurity, image signing); cloud platform security (AWS/Azure/GCP IAM and network controls); and security tools such as encryption technologies, intrusion detection/prevention, EDR, and penetration testing frameworks. The ideal candidate brings a strong systems and security engineering background (Linux/Windows, containers/Kubernetes, networking, identity, and cloud), experience architecting security patterns and automating enforcement (Terraform/Ansible, Python/PowerShell/Bash), and a practical understanding of how engineering enables ATO readiness in high tempo environments.
p>Seeking experienced offensive security professionals to conduct security assessments, red team operations, and network exploitation activities in support of client security requirements. Bachelor Degree in Computer Science or related field is required or 5 years of direct work experience.
In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. 3+ years working with cloud infrastructure, including Kubernetes/Docker, cloud databases, application servers, and networking (VPC, load balancers, API gateways).
Washington, DC30+ days ago
p>Vulnerability Management: Collaborate with the SOC team and infrastructure teams to contextualize vulnerability findings from Tenable and similar tools, prioritizing remediation based on exploitability, exposure, and mission impact-not just CVSS scores. ISSO Liaison: Work alongside ISSOs to translate technical system changes (network reconfigurations, cloud migrations, new integrations) into risk language and updated authorization documentation.
Our focus is on mitigating attack risks, securing cloud transformation, and fostering a culture of security and reliability within our team The Information Security Services team works to protect, defend, and reduce risks across applications, platforms, infrastructure, and services to keep our assets and resources secure. We are seeking a Senior Software Engineer with information security expertise to help design and build secure, resilient services and AI-driven workflows for our Golden Path initiative, supporting enterprise security automation and compliance validations.
p>Candidate Resources Chantilly Charleston Colorado Springs Crane El Segundo Fort Meade Hampton Roads Hawaii Huntsville Reston San Diego Southern Maryland St. Louis Washington DC View All Locations Business Management Cyber Cloud Data Science DevSecOps Electrical Engineering Mechanical Engineering Network Engineering Software Engineering Systems Engineering Technical Support View All Career Fields. Please apply through the internal career site here > Address 12010 Sunset Hills Road Reston VA Facebook Page Instagram Feed X Feed Linkedin Page Youtube Page What We Do Mission IT Engineering Services Enterprise IT Professional Services Who We Serve Federal Civilian State and Local Defense Intelligence Community Space Contracts Who We Are About SAIC Investors Newsroom National Imperatives Partnerships Suppliers and Small Business Careers Employee Tools Contact Us 2025 SAIC.
Washington, DC30+ days ago
p style="margin-bottom:26px">We are seeking a Mid Level ISSE to carry out the following duties and responsibilities: - Services to support Information System Engineering performed by the Information System Security Engineer (ISSE) at a minimum, shall consist of the following activities:
- Identify information protection needs for an IS and Network Environment.
- Minimum 5 years’ experience, or equivalent education/experience; Doctorate plus 4 years; Master’s plus 3 years; Associates plus 7 years; or H.S./GED plus 10 years.
Springfield, Virginia1 day ago
ul class="[li_&]:mb-0 [li_&]:mt-1 [li_&]:gap-1 [&:not(:last-child)_ul]:pb-1 [&:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3">Advise on system design and architecture from a security-first perspective — working with developers, engineers, and project managers to build protection in from day one. - 10+ years of experience in information security, data security administration, or a related discipline.
p>Applies system security engineering expertise in one or more of the following to: system security design process; engineering life cycle; information domain; cross domain solutions; commercial off-the-shelf and government off-the-shelf cryptography; identification; authentication; and authorization; system integration; risk management; intrusion detection; contingency planning: incident handling; configuration control; change management; auditing; certification and accreditation process; principles of IA (confidentiality, integrity, non-repudiation, availability, and access control); and security testing. The Level 1 Information Systems Security Engineer (ISSE) shall possess the following capabilities:
- Participate as a security engineering representative on engineering teams for the design, development, implementation and/or integration of secure networking, computing, and enclave environments.
Alexandria, VA30+ days ago
Leidos Digital Modernization sector is seeking an experienced SME Cybersecurity Engineer to support the delivery, enhancement, and adoption of enterprise data and analytics products used across multiple DoD organizations. Bachelor's degree in Computer Science, Engineering, Information Systems, Cybersecurity, or related technical discipline and 12-15 years of relevant experience OR Master's degree in a related field and 10-13 years of relevant experience.
Sterling, Virginia30+ days ago
Security Engineering: Designs security architectures from requirements phase, defining system security requirements, and integrating capabilities including Zero Trust Architecture Software Defined Networking (SDN), macro/micro-segmentation, and software-defined perimeter controls to enable continuous verification and minimize network attack surfaces. Pay Range:
There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications.
Reston, Virginia16 days ago
Apply system security engineering expertise in one or more of the following to: system security design process; engineering life cycle; information domain; cross domain solutions; commercial off-the-shelf and government off-the-shelf cryptography; identification; authentication; and authorization; system integration; risk management; intrusion detection; contingency planning; incident handling; configuration control; change management; auditing; certification and accreditation process; principles of IA (confidentiality, integrity, non-repudiation, availability, and access control); and security testing. Mantis Security is a leading specialty firm of high caliber talent who specialize in Cyber Operations, Cyber Defense, Information Assurance, Software Development, DevSecOps, Security Engineering, and Cloud Engineering.
Springfield, Virginia4 days ago
Washington, District of Columbia30+ days ago
The Cortex XSIAM Engineer will serve as a subject-matter expert (SME) throughout the full platform lifecycle: from requirements gathering and architecture design through deployment, integration, and continuous optimization — driving measurable improvements in threat detection and incident response times for our government and commercial clients.
Key Responsibilities
Platform Deployment & Integration
- Lead end-to-end deployment of Cortex XSIAM for federal and enterprise clients, including data source onboarding, log ingestion, and normalization.
Springfield, Virginia30+ days ago
div>Requisition #: 1289
Job Tittle: FO Security Engineer
Clearance: Secret
Location: Springfield, VA
The Security Engineering Team (SET) is required to provide network maintenance and special projects engineering support.
About Agile Defense
At Agile Defense we know that action defines the outcome and new challenges require new solutions.
We"re looking for engineers who bring fresh ideas from all areas, including information retrieval, distributed computing, large-scale system design, networking and data storage, security, artificial intelligence, natural language processing, UI design and mobile; the list goes on and is growing every day. As a software engineer, you will work on a specific project critical to Googles needs with opportunities to switch teams and projects as you and our fast-paced business grow and evolve.
Washington D.C., DC3 days ago
li>Deliver in-depth security and compliance expertise to support the technical relationship with Google's customers, including product and solution briefings, proof-of-concept work, partner directly with product management to prioritize solutions impacting customer adoption to Google Cloud and security offerings. We focus on helping United States public sector institutions accelerate their digital transformations, and we continue to make significant investments and grow our team to meet the complex needs of local, state and federal government and educational institutions.
We focus on helping United States public sector institutions accelerate their digital transformations, and we continue to make significant investments and grow our team to meet the complex needs of local, state and federal government and educational institutions. Own the technical relationship with partners, empowering them to drive a successful pilot or proof of concept, support partners drive toward customer acceptance of the technical proposal, leading to an agreement, and work with partners during the migration phase to assure they have all the tools necessary to deliver a successful deployment.
We"re looking for engineers who bring fresh ideas from all areas, including information retrieval, distributed computing, large-scale system design, networking and data storage, security, artificial intelligence, natural language processing, UI design and mobile; the list goes on and is growing every day. As a critical part of Google Threat Intelligence Group (GTIG)-Tech, the Data Pipelines team builds and scales the core infrastructure required to expand the ingestion of data sources and accelerate the flow of threat intelligence to our analysts, the security teams across the various Alphabet product areas, and our customers.
We"re looking for engineers who bring fresh ideas from all areas, including information retrieval, distributed computing, large-scale system design, networking and data storage, security, artificial intelligence, natural language processing, UI design and mobile; the list goes on and is growing every day. As a critical part of Google Threat Intelligence Group (GTIG)-Tech, the Data Pipelines team builds and scales the core infrastructure required to expand the ingestion of data sources and accelerate the flow of threat intelligence to our analysts, the security teams across the various Alphabet product areas, and our customers.
Exostar’s cloud-based platforms create exclusive communities within the Aerospace and Defense, Life Sciences, and other highly regulated industries where members securely collaborate, share information, and operate compliantly. Support internal and external audits (e.g., ISO 27001, SOC 2, Cyber Essentials, Kantara, FPKI, FedRAMP, CMMC) by translating technical implementations into defensible evidence.
li>Configure and tune DLP tools, DSPM, CASB, and cloud-native security controls to detect and prevent exfiltration of sensitive data or models, using statistical and machine learning techniques to optimize detection thresholds and reduce false positives.
You have:
5+ years of experience in data security, cybersecurity, or information protection roles, ideally in mid- to large-scale environments, with a strong understanding of how data is collected, used, and protected across complex ecosystems.
li>Security Engineering: Designs security architectures from requirements phase, defining system security requirements, and integrating capabilities including Zero Trust Architecture Software Defined Networking (SDN), macro/micro-segmentation, and software-defined perimeter controls to enable continuous verification and minimize network attack surfaces. Pay Range:
There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications.
Chantilly, VA30+ days ago
Job Title: Senior Cyber Security Engineer (Splunk) Job Category: Information Technology Time Type: Full time Minimum Clearance Required to Start: TS/SCI with Polygraph Employee Type: Regular Percentage of Travel Required: Up to 10% Type of Travel: Local. Occasionally move about inside the office to access file cabinets, office machinery, or to communicate with co-workers, management, and customers via email, phone, or virtual communication, which may involve delivering presentations.
The Risk and Compliance Programs team is part of the Cloud CISO organization, driving high priority risk management efforts through formalized programs, including insider and technology risk. Partner with engineering organizations to identify, develop, document, and test controls for design and operating effectiveness, in coordination with the Cloud CISO controls team.
The ISSE collaborates with multidisciplinary teams - including Information Systems Security Managers (ISSMs), software developers, systems engineers, and government stakeholders-to integrate effective security controls and ensure systems remain resilient against evolving threats and vulnerabilities. Primary Responsibilities:
Applying system security engineering principles in areas such as system security design, lifecycle engineering, authentication and authorization mechanisms, cryptography, intrusion detection, contingency planning, incident handling, auditing, configuration management, and change control.
Falls Church, VA30+ days ago
p>Key Responsibilities: KBR seeks an Information Systems Security Engineer to serve as the Program Office's information security professional responsible for managing all aspects of an organization's information security system, including researching, testing, training, and implementing programs designed to safeguard sensitive information from possible compromise.
The ISSE works with System Engineering teams to incorporate cyber resiliency objectives, techniques, and design principles into all system engineering and development efforts throughout the systems development life cycle (SDLC).
McLean, Virginia30+ days ago
p>· Experience: A minimum of 5-8 years of experience in information security engineering, system administration, and/or cybersecurity, with hands-on experience in implementing security controls and supporting authorization processes. · Collaboration and Guidance: Serve as a subject matter expert, providing guidance to development, engineering, and program teams on secure design, development, and secure coding techniques.
Herndon, Virginia30+ days ago
This role is designed for a hands-on security engineer with strong architecture and implementation experience who can partner directly with infrastructure, platform, and product teams to design and build secure systems. Exostar’s cloud-based platforms create exclusive communities within the Aerospace and Defense, Life Sciences, and other highly regulated industries where members securely collaborate, share information, and operate compliantly.
System methodologies including client/server, web hosting, web content servers, policy servers, directory servers, firewalls, WAN, MAN, LAN, switches, and routers. We are seeking talented Mid-level Information Systems Security Engineers (ISSE), to provide critical Systems Engineering and Technical Assistance (SETA) support for a prestigious National customer.
Chantilly, VA30+ days ago
System methodologies including client/server, web hosting, web content servers, policy servers, directory servers, firewalls, WAN, MAN, LAN, switches, and routers. We are seeking talented Mid-level Information Systems Security Engineers (ISSE), to provide critical Systems Engineering and Technical Assistance (SETA) support for a prestigious National customer.
Founded in 1986, OnTrac has evolved into the leading provider of same-day and next-day delivery services in the U.S. for premier e-commerce and product-supply businesses, including five of the largest retailers in the U.S. Location: Remote - Washington D.C., Maryland, Virginia (Preferably). Your Mission in Motion: SOC + GRC enablement: Design and implement technical solutions that assist the SOC in alert orchestration (SOAR) and provide the GRC team with automated risk monitoring and evidence collection capabilities.
Growth Opportunities: Appian provides a diverse array of growth and development opportunities, including our leadership program tailored for new and aspiring managers, a comprehensive library of specialized department training through Appian University, skills based training, and tuition reimbursement for those aiming to advance their education. You will join a team that builds internal tools and CI/CD pipelines, integrates third-party security tools, helps maintain a secure code base, and partners with stakeholders to ensure the availability of security and corporate services.