Ontology Software Developer (TS/SCI) MaxaarOntology Software Developer (TS/SCI)Herndon, Virginia$220,000–$242,000 / yearWorking within an Agile DevSecOps environment, the Software Engineer collaborates with ontology engineers, database engineers, data scientists, and Government stakeholders to deliver secure, high-performance applications that leverage Semantic Web technologies and AI/ML capabilities. This position develops scalable applications, APIs, and microservices that integrate ontology-driven data models, knowledge graphs, and enterprise data sources to support Object-Based Intelligence workflows.
Ontology Software Developer (TS/SCI) Vantor ServicesOntology Software Developer (TS/SCI)Herndon, Virginia$220,000–$242,000 / yearWorking within an Agile DevSecOps environment, the Software Engineer collaborates with ontology engineers, database engineers, data scientists, and Government stakeholders to deliver secure, high-performance applications that leverage Semantic Web technologies and AI/ML capabilities. This position develops scalable applications, APIs, and microservices that integrate ontology-driven data models, knowledge graphs, and enterprise data sources to support Object-Based Intelligence workflows.
Traffic Engineer - Entry Level Whitman, Requardt & Associates, LLPTraffic Engineer - Entry LevelFairfax, VA$70,000–$125,000 / yearFull timeOur traffic engineers design traffic signals, signing, markings, roadway/parking lot lighting, work zone traffic control, and ITS devices; conduct traffic safety/operations studies; and develop or apply Synchro, SimTraffic, VISSIM, and VISUM models. Project assignments can range from small-scale intersection improvements to complex interchange and corridor projects, as well as innovative multimodal transportation plans and parking studies.
Junior Software Engineer (SWE-1) LeidosJunior Software Engineer (SWE-1)MarylandOur 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. June 15, 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.
Senior Full-Stack Software Engineer Staffed4USenior Full-Stack Software EngineerMarylandThe selected candidate will serve as a Full-Stack Software Engineer supporting a mission-focused team responsible for developing custom applications, data-driven solutions, and workflow automation tools. The candidate will work directly with end users and stakeholders to design, build, and maintain applications that improve mission processes, enhance data visibility, and enable informed decision-making.
Software Engineer (Mid- Senior Level)- Java Staffed4USoftware Engineer (Mid- Senior Level)- JavaAnnapolis Junction, MarylandWe are seeking a mid-senior level Software Engineer with a minimum of 6+ years of expertise and a technical Bachelor’s degree to join our team in Annapolis Junction, MD. Analyze and develop solutions through performance measurements and collaborate with engineers to improve flows, usage or processes.
Software Engineer - Front End Angular - TS/SCI Maania Consultancy ServicesSoftware Engineer - Front End Angular - TS/SCIHerndon, VAFull timeExperience consuming APIs (REST and/or GraphQL), handling auth/session patterns, and error states. Strong, hands-on expertise with Angular (components, modules, routing, forms, RxJS).
NewSoftware Engineer (Mid-Senior Level) - Java Staffed4USoftware Engineer (Mid-Senior Level) - JavaAnnapolis Junction, MarylandOur client is seeking a mid-senior level Software Engineer with a minimum of 6+ years of expertise and a technical Bachelor’s degree to join our team in Annapolis Junction, MD. Through flexibility, transparency, and strong support, we enable our team to thrive—fueling curiosity, creativity, and innovative solutions that truly serve their clients.
NewSr. Data Science Software Engineer Staffed4USr. Data Science Software EngineerLaurel, MarylandResponsibilities include developing new methods for automating compliance functions, improving existing processes, and investigating, integrating, and testing compliance modernization Machine Learning/AI algorithms and proof-of-concepts in a research and development environment. The company offers an outstanding benefits package, values work-life balance, and provides opportunities to work on cutting-edge technologies supporting critical national security missions.
Cloud Software Engineer Halcyon Days ConsultingCloud Software EngineerMarylandHDC is seeking a Cloud Software Engineer who will be responsible for designing and implementing advanced functions of Microsoft Office 365 and/or Azure AD premium, including security, governance, and compliance. Halcyon Days Consulting, LLC (HDC) is a veteran owned small business that specializes in the design and engineering of Tactical Mission Networks (TMN).
Principal Software Engineer Recorded FuturePrincipal Software EngineerWashington, DC$152,000–$228,500 / yearAs a Principal Software Engineer, you will work across application code and infrastructure to collect, transform, and deliver structured threat data: tracking malware infrastructure, phishing campaigns, spam networks, command-and-control systems, and more. What You'll Do: Data Pipeline Ownership: Design, build, and maintain scalable data pipelines that collect, transform, and deliver structured threat intelligence data powering the Security Intelligence Graph.
Senior Software Engineer (Agentic AI Platform) Staffed4USenior Software Engineer (Agentic AI Platform)Columbia, MarylandThe candidate will work closely with technical stakeholders and analysts to translate operational requirements into AI-enabled capabilities that improve automation, data processing, and system interoperability in complex environments. The selected candidate will serve as a Senior Software Engineer supporting the design, development, and sustainment of an advanced agent-based platform for intelligent and autonomous workflows.
Software Engineer - TS/SCI with Poly Staffed4USoftware Engineer - TS/SCI with PolyAnnapolis Junction, MarylandIn this role, you will contribute to the design, development, and deployment of a Retrieval-Augmented Generation (RAG) solution within a high-performance computing (HPC) Linux environment. Our client offers a highly competitive and comprehensive benefits package designed to support your personal and professional growth, while promoting a healthy work-life balance.
Full-Stack Software Engineer - Level 2 Staffed4UFull-Stack Software Engineer - Level 2MarylandThis role operates within a highly collaborative environment, working across multiple teams and technology stacks to design and deliver impactful solutions. The selected candidate will serve as a Full-Stack Software Engineer supporting the development of mission-critical systems focused on improving infrastructure visibility and operational awareness.
Frontend Software Engineer Maania Consultancy ServicesFrontend Software EngineerLaurel, MDRemoteFull timeReact, TypeScript, Cesium, Flask, FastAPI, GitLab, OpenShift, secure SDLC, and testing experience. If you're interested please share your update resume along with your yearly expected salary.
Software Engineer 3 (IDN - 181) SageCor SolutionsSoftware Engineer 3 (IDN - 181)Fort Meade, MarylandServing Maryland and the Greater Washington D.C. area, SageCor Solutions (SageCor) is a growing company bringing complete engineering services and true full lifecycle System Engineering services to areas requiring (or desiring) nationally-recognized expertise in high performance computing, large data analytics and cutting edge information technologies. Bachelor’s degree in computer science or related discipline from an accredited college or.
Software Engineer 2 (IDN - 173) SageCor SolutionsSoftware Engineer 2 (IDN - 173)Fort Meade, MarylandServing Maryland and the Greater Washington D.C. area, SageCor Solutions (SageCor) is a growing company bringing complete engineering services and true full lifecycle System Engineering services to areas requiring (or desiring) nationally-recognized expertise in high performance computing, large data analytics and cutting edge information technologies. university, plus five (5) years of experience as a SWE, in programs and contracts of similar scope, type, and complexity.
Senior Software Engineer - Architecture & Systems Design CACISenior Software Engineer - Architecture & Systems DesignHerndon, VirginiaPay 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. Create technical documentation including message sequence charts, UML class diagrams, and software architecture specifications that enable distributed teams to build complex systems correctly and efficiently.
Senior Signals Software Engineer GliaCell TechnologiesSenior Signals Software EngineerColumbia, MD$170,000–$260,000 / yearWe also provide customer solutions in the areas of CND, CNE, and CNO by providing our customers with assessments and solutions in Threat Mitigation, Vulnerability Exposure, Penetration Testing, Threat Hunting, and Preventing Advanced Persistent Threat. Fourier transforms, filtering, communications theory, digital modulation, error control coding, signal analysis tools, digital signal processing.
Software Engineer IV ProsyncSoftware Engineer IVAnnapolis Junction, MDProvides specific input to the software components of system design to include hardware/software trade-offs, software reuse, use of Open Source Software (OSS) and/or Commercial OffThe-Shelf (COTS) Government Off-The-Shelf (GOTS) software in place of new development, and requirements analysis and synthesis from system level to individual software components. These systems might include, but are not limited to, processing intensive analytics, novel algorithm development, manipulation of extremely large data sets, real-time systems, business management information systems, and systems which incorporate data repositories, data transport services, and application and systems development and monitoring.