div>As a Senior Information Security Systems Engineer (ISSE) you will join a small team of security engineers providing Information Assurance (IA) Architecture Analysis and Security Engineering Support for the implementation and fielding of the National Leadership Command Capability in support of Nuclear Command, Control, and Communications (NC3), Continuity of Government (COG), and Senior Leader communications. March 9, 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.
Linthicum, Maryland30+ days ago
div>As a Senior Information Security Systems Engineer (ISSE) you will join a small team of security engineers providing Information Assurance (IA) Architecture Analysis and Security Engineering Support for the implementation and fielding of the National Leadership Command Capability in support of Nuclear Command, Control, and Communications (NC3), Continuity of Government (COG), and Senior Leader communications. December 12, 2025
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.
Validates and verifies system security requirements definitions and analysis and establishes system security designDesigns, develops, implements and/or integrates IA and security systems and system components including those for networking, computing and enclave environment to include those with multiple enclaves and with differing data protection/classification requirementsAssist architects and systems developers in the identification and implementation of appropriate information security functionality to ensure uniform application of Agency security policy and enterprise solutionsContributes to the security planning, assessment, risk analysis, risk management, certification and awareness activities for system and networking operationsReviews C&A documentation, providing feedback on completeness and compliance of its contentCLEARANCE REQUIRED: Active TS/SCI with polygraph. QualificationsBachelor of Science degree from an accredited university ideally in Computer Science, Information Assurance, Information Security System Engineering or related field with a minimum of 20 years of experience as an Information Systems Security Engineer (ISSE) or System Engineer on programs and/or contracts with the customer spaceCISSP - ISSEPStrong writing skillsConfidence and ability to present briefing to senior level DoD officials in both prepared briefings and/or in ad hoc discussions.
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.
Chantilly, Virginia22 days ago
Responsibilities: Peraton is seeking a Senior System Developer with extensive integration experience to join our team in developing, integrating, and testing new capabilities while supporting Operations and Maintenance of a Linux- and Windows-based operational and administrative system in our Chantilly, VA office.
Peraton offers enhanced benefits to employees working on this critical National Security program, which include heavily subsidized employee benefits coverage for you and your dependents, 25 days of PTO accrued annually up to a generous PTO cap and eligible to participate in an attractive bonus plan.
div>The pay range for the states of California, Colorado, Hawaii, Illinois, Maine, Maryland, Massachusetts, Minnesota, New Jersey, New York, Vermont, Virginia, Washington, and the District of Columbia, and the city of Cleveland is:
$106,300—$221,100 USD
What We Believe
As a company wholly dedicated to serving the US federal government, we bring together the best talent to help reinvent how federal agencies operate and deliver greater value for their mission and the American people. Accommodations made to facilitate the recruiting process are not a guarantee of future or continued accommodations once hired.
If you are being considered for employment opportunities with Accenture Federal Services and need an accommodation for a disability or religious observance during the interview process or for the job you are interviewing for, please speak with your recruiter.
Other Employment Statements
Applicants for employment in the US must have work authorization that does not now or in the future require sponsorship of a visa for employment authorization in the United States.
Candidates who are currently employed by a client of Accenture Federal Services or an affiliated Accenture business may not be eligible for consideration.
Annapolis Junction, MD30+ days ago
Success in this role looks like digging in with your teams to effectively perform requirements analysis, refinement, documentation, some testing support, and pushing secure access solutions forward to support the customer. For the full list of LufCo Benefits, visit our website: https://www.lufburrow.com/careers .
Laurel, Maryland19 days ago
p style="margin:0px">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 .
McLean, Virginia25 days ago
We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. Established in 2015, Fantom Corp serves Federal customers with top-notch Cybersecurity Architects, Data Scientists/Analysts, Software Engineers/Developers, DevSecOps Engineers, Project Managers, Identity, Credential Access Management (ICAM) services , and Cloud-certified practitioners.
Chantilly, VA30+ days ago
p>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.
7+ years in Engineering and Developing (Network, Communications, Computer Systems), Computer Science, Computer Information Systems or equivalent relevant work experience.
Chantilly, Virginia30+ days ago
p>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.
7+ years in Engineering and Developing (Network, Communications, Computer Systems), Computer Science, Computer Information Systems or equivalent relevant work experience.
li>Assist in systems/software engineering functions, to include creation of data flow diagrams, interface control documents, perform trade studies, and Static Application Security Testing (SAST) for Application Security and Development Secure Technical Implementation Guide (STIG) compliance using tools such as Fortify/Coverity and Gitlab as part of a DevSecOps Continuous Integration/Continuous Deployment (CI/CD) Pipeline, and generation of summary reports. Perform skills in implementing/assessing security controls, to include writing system security categorization memorandum, recommending appropriate security control overlays, define security control baseline based on defined system security categorization and approved security overlays, and apply security controls to computing/network nodes and verify implementation of security controls.
p>Required: - Bachelor's degree in Aerospace Engineering, Systems Engineering, Electrical Engineering, Computer Engineering, Physics, Computer Science, or a related technical discipline. This position serves as a critical interface between spacecraft operations teams, system developers, and factory engineering organizations to ensure capabilities are successfully integrated into operations and mission objectives are achieved.
We strive to attract and retain the best employees by providing an inclusive work environment wherein employees are receptive to diverse ideas, perspectives, and talents to help solve our toughest customer challenges: to develop and maintain some of the most technically sophisticated products, programs, and services in the world. The successful candidate will be expected to monitor, maintain, and provide Tier-2 and Tier-3 support of a mission critical network infrastructure, collect data for analysis, perform network upgrades, and be able to produce documentation and diagrams of the work they perform.
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.
p>Country Code+1+1242+1246+1264+1268+1284+1340+1441+1473+1649+1664+1670+1671+1684+1758+1767+1784+1849+1868+1869+1876+1939+20+211+212+213+216+218+220+221+222+223+224+225+226+227+228+229+230+231+232+233+234+235+236+237+238+239+240+241+242+243+244+245+248+249+250+251+252+253+254+255+256+257+258+261+262+264+265+266+267+268+269+27+290+291+297+298+299+30+31+32+33+34+345+350+351+352+353+354+355+356+357+358+359+36+370+371+372+373+374+375+376+377+378+379+380+381+382+385+386+387+389+39+40+41+420+421+423+43+44+45+46+47+48+49+500+501+502+503+504+505+506+507+508+509+51+52+53+54+55+56+57+58+590+591+593+594+595+596+597+598+599+60+61+62+63+64+65+66+670+672+673+674+675+676+677+678+679+680+681+682+683+685+686+687+688+689+690+692+7+77+81+82+84+850+852+853+855+856+86+872+880+886+90+91+92+93+94+95+960+961+962+963+964+965+966+967+968+970+971+972+973+974+975+976+977+98+992+993+994+995+996+998Phone Number. Job CategorySelect a Job CategoryB2B SalesBilingualCall CenterCorporateCustomer ServiceCybersecurityData and AnalyticsDeveloperEarly Careers & InternshipsField SalesFinanceGovernment SupportHuman ResourcesInstallation TechnicianInternshipsLegalMarketing & Public RelationsPart TimeRetailSalesSecurity ClearanceSupply ChainTechnicianTechnologyWork From Home.
Chantilly, Virginia4 days ago
Together with our clients, we strive to create a safer, smarter world by harnessing the power of deep expertise and advanced technology.Join our Talent Community to stay up to date on our career opportunities and events at.
Total Rewards at GDIT:.
McLean, Virginia12 days ago
Together with our clients, we strive to create a safer, smarter world by harnessing the power of deep expertise and advanced technology.Join our Talent Community to stay up to date on our career opportunities and events at.
Total Rewards at GDIT:.
div>The pay range for the states of California, Colorado, Hawaii, Illinois, Maine, Maryland, Massachusetts, Minnesota, New Jersey, New York, Vermont, Virginia, Washington, and the District of Columbia, and the city of Cleveland is:
$135,200—$278,500 USD
What We Believe
As a company wholly dedicated to serving the US federal government, we bring together the best talent to help reinvent how federal agencies operate and deliver greater value for their mission and the American people. Accommodations made to facilitate the recruiting process are not a guarantee of future or continued accommodations once hired.
If you are being considered for employment opportunities with Accenture Federal Services and need an accommodation for a disability or religious observance during the interview process or for the job you are interviewing for, please speak with your recruiter.
Other Employment Statements
Applicants for employment in the US must have work authorization that does not now or in the future require sponsorship of a visa for employment authorization in the United States.
Candidates who are currently employed by a client of Accenture Federal Services or an affiliated Accenture business may not be eligible for consideration.
Chantilly, Virginia30+ days ago
p>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.
7+ years in Engineering and Developing (Network, Communications, Computer Systems), Computer Science, Computer Information Systems or equivalent relevant work experience.
p>Peraton is seeking a Senior System Developer with extensive integration experience to join our team in developing, integrating, and testing new capabilities while supporting Operations and Maintenance of a Linux- and Windows-based operational and administrative system in our Chantilly, VA office. Benefits:
Peraton offers enhanced benefits to employees working on this critical National Security program, which include heavily subsidized employee benefits coverage for you and your dependents, 25 days of PTO accrued annually up to a generous PTO cap and eligible to participate in an attractive bonus plan.
Must have twenty years of experience as an Information Systems Security Engineer supporting programs and contracts of similar scope, type, and complexity, including recent experience within the last five years with Cybersecurity principles and technologies such as access control, authorization, identification and authentication, public key infrastructure, and network and enterprise security architecture, or eighteen years of experience with a qualifying master's degree, or twenty-four years of ISSE experience if no bachelor's degree is held. • Must have a bachelor's degree in Computer Science, Information Assurance, Information Security System Engineering, or a related discipline from an accredited college or university, or four additional years of ISSE experience may be substituted for the degree, and must be DoD 8570 compliant with IASAE III, including CISSP-ISSEP certification for CWIP IASAE III compliance.
p>Intelink Services provide interagency information sharing, content discovery, and collaboration capabilities on the IC system domains to the IC and its partners in Defense, Homeland Security, Foreign Affairs, and Law Enforcement. AT&T Global Public Sector is a trusted provider of secure, IP enabled, cloud-based, network solutions and professional services to the Federal Government.
li>Must have a bachelor's degree in Computer Science, Information Assurance, Information Security System Engineering, or related discipline from an accredited college or university, OR 11 years of Information Systems Security Engineer experience if a degree is not held, and must meet DoD 8570 compliance with IASAE Level 2.
Active TS/SCI clearance with Polygraph is required.
Requirements:
Must have the ability to participate as a security engineering representative on engineering teams for the design, development, implementation, evaluation, and integration of secure networking, computing, and enclave environments, including serving as the primary representative when required.
p>Bachelor of Science Degree in Information Technology Discipline with 2 years of work experience in any combination of: System Administrator (SA), Information System Security Officer (ISSO), Information System Security Engineer (ISSE), Information Technology (IT) Service Desk, Computer Network Defense (CND) Analyst, Telecommunication Technician, and Network Administration. Associates Degree in Information Technology Discipline with 4 years of work experience in any combination of: System Administrator (SA), Information System Security Officer (ISSO), Information System Security Engineer (ISSE), Information Technology (IT) Service Desk, Computer Network Defense (CND) Analyst, Telecommunication Technician, and Network Administration.
Chantilly, Virginia2 days ago
li style="margin-left:8px">Experience optimizing algorithms for efficiency and implementing monitoring tools like Prometheus or MLflow to track model performance, detect drift, and ensure software reliability in production environments. Developing, testing, evaluating, and integrating machine learning models, in particular Large Language Models, into production software.
Annapolis Junction, Maryland16 days ago
p>Join a dynamic and forward-thinking team as a Senior Integration Developer, where you will play a key role in designing, developing, testing, and deploying innovative cross-domain and integration solutions supporting a mission-critical system. While the role supports the Pega platform, the primary focus will be on implementing cross-domain solutions to securely move and integrate data between environments, as well as developing and supporting microservices-based architectures and integrations.
Annapolis Junction, Maryland16 days ago
Developers on this team work with a combination of visual application design, software engineering principles, API integrations, cloud technologies, and enterprise architecture patterns to rapidly deliver mission-critical solutions. Pega is a leading enterprise application platform used by major government agencies and Fortune 500 organizations to build workflow-driven applications, automate complex business processes, and modernize legacy systems.
Columbia, Maryland30+ days ago
Overview: BigBear.ai is seeking a Software Engineer 3 to focus on improving the productivity and experience of software developers by building and integrating advanced development tooling. This role emphasizes AI-assisted IDE capabilities, automated code quality workflows, and experimentation with agentic and autonomous systems to support software development tasks.
div> Position Overview:
- Develop and design complex reports using Power BI and SQL querying.
Key Responsibilities:
- Analyze data from multiple sources and identify validation processes.
Springfield, VA30+ days ago
You will work alongside experienced GEOINT professionals who value clear communication, disciplined engineering, and systems that work as intended in operational environments. If you are motivated by supporting GEOINT analysts, improving mission systems, and delivering reliable capabilities to the operational community, we invite you to apply.
p>Clearance: Must possess and maintain an active TS/SCI w/Polygraph Education & Experience: 12 years of experience with a B.S. in a technical discipline or 4 additional years of experience in place of a degree Technical Expertise: Strong software engineering skills in one or more modern programming languages Experience with IDEs, developer tools, or build and test systems Hands-on experience with AI- or LLM-powered developer tools, including chat-based interfaces or automated coding agents Ability to prototype, evaluate, and refine experimental tooling Solid understanding of software development workflows and best practices. Tooling Development: Design and implement AI-assisted IDE and developer tooling capabilities Agent Integration: Integrate agent-based systems for repetitive developer tasks such as code reviews, unit test generation, and code quality analysis Experimentation: Experiment with autonomous or semi-autonomous agents to assist with development workflows Platform Integration: Integrate new tools into existing development platforms and pipelines Collaboration: Collaborate with customers and teammates to gather feedback and iterate on solutions Effectiveness Measurement: Measure and document the effectiveness of tooling improvements.
Fort Meade, Maryland30+ days ago
Node Zero autonomous pen testing platform and (2) create and curate the training datasets required to enable future AI-powered cyber tools. Responsibilities: The Instructional Systems Developer (ISD) designs and develops training materials that prepare USCYBERCOMMAND personnel to (1) operationally use the Horizon3.ai
p>If you have the courage to take on a wide variety of complex challenges, then you will experience a unique working environment where innovative teams blend different perspectives, disciplines, and technologies to discover new ways of solving complex problems. Incident Resolution: Troubleshoot platform issues, respond to user service requests, and resolve incidents in a timely manner, escalate to System Developers or other team members as appropriate.
Annapolis Junction, Maryland16 days ago
Working alongside experts in software engineering, cloud computing, DevSecOps, systems engineering, user experience, and enterprise platforms, you'll help modernize legacy systems, automate business processes, integrate commercial technologies, and deliver innovative solutions that improve efficiency, reduce costs, and enhance the user experience. These mission-enabling applications support workforce management, finance, acquisitions, security processing, training, recruitment, logistics, program management, executive decision-making, and other critical business functions across multiple secure environments.
Chantilly, Virginia3 days ago
p style="margin:0in">If you have the courage to take on a wide variety of complex challenges, then you will experience a unique working environment where innovative teams blend different perspectives, disciplines, and technologies to discover new ways of solving complex problems. Company Overview: We are a world-class team of professionals who deliver next generation technology and products in robotic and autonomous platforms, ground, soldier, and maritime systems in 50+ locations world-wide.
Annapolis Junction, Maryland16 days ago
Developers on this team work with a combination of visual application design, software engineering principles, API integrations, cloud technologies, and enterprise architecture patterns to rapidly deliver mission-critical solutions. Pega is a leading enterprise application platform used by major government agencies and Fortune 500 organizations to build workflow-driven applications, automate complex business processes, and modernize legacy systems.
Laurel, Maryland30+ days ago
p style="margin:0px">We are seeking a dynamic, creative, and analytical candidate to help us assess the design and influence the capability development of the U.S. Navy's Maritime Surveillance Systems (MSS) Low Frequency Active (LFA), Compact LFA (CLFA), and prototype Deployable Active Systems. - Have earned a US Navy designator, billet classification, or enlisted classification code related to surveillance systems and/or active sonar, or have a B.S. in Engineering, Physics, Mathematics, Computer Science, or related technical field.
p>We are seeking a dynamic, creative, and analytical candidate to help us assess the design and influence the capability development of the U.S. Navy's Maritime Surveillance Systems (MSS) Low Frequency Active (LFA), Compact LFA (CLFA), and prototype Deployable Active Systems. - Have earned a US Navy designator, billet classification, or enlisted classification code related to surveillance systems and/or active sonar, or have a B.S. in Engineering, Physics, Mathematics, Computer Science, or related technical field.
li>Customer Service - Works with clients and customers (that is, any individuals who use or receive the services or products that your work unit produces, including the general public, individuals who work in the agency, other agencies, or organizations outside the Government) to assess their needs, provide information or assistance, resolve their problems, or satisfy their expectations; knows about available products and services; is committed to providing quality products and services. Selectees who physically reside permanently in the U.S., the Commonwealth of Puerto Rico or Northern Mariana Islands, and the Possessions of the U.S., during the entire recruitment process (application, selection, and acceptance of a formal job offer) and selected for employment in the foreign area are eligible to receive certain foreign area benefits such as: Living Quarters Allowance (LQA) or government quarters, Post Allowance, Home Leave, etc.
Alexandria, VA29 days ago
We are seeking a highly skilled Database Architect/Administrator (DBA) with strong experience in SQL Server (and Oracle would be a bonus) to support a strategic initiative transitioning operational database responsibilities from the Business Systems group into IT Operations. Redesign database hosting environments to reduce complexity and improve scalability, licensing costs, and flexibility - conversion from single SQL server model into a SQL cluster environment is highly desirable. ?
Alexandria, VA30 days ago
We are seeking a highly skilled Database Architect/Administrator (DBA) with strong experience in SQL Server (and Oracle would be a bonus) to support a strategic initiative transitioning operational database responsibilities from the Business Systems group into IT Operations. Redesign database hosting environments to reduce complexity and improve scalability, licensing costs, and flexibility - conversion from single SQL server model into a SQL cluster environment is highly desirable. ?