Ontology Software Developer (TS/SCI)

Vantor is forging the new frontier of spatial intelligence, helping decision makers and operators navigate what’s happening now and shape what’s coming next. Vantor is a place for problem solvers, changemakers, and go-getters—where people are working together to help our customers see the world differently, and in doing so, be seen differently. Come be part of a mission, not just a job, where you can: Shape your own future, build the next big thing, and change the world.To be eligible for this position, you must be a U.S. Citizen. This position requires an active U.S. Government security clearance, applicants who do not currently hold the required clearance will not be eligible for consideration. Employment for cleared roles is contingent upon verification of clearance status. Export Control/ITAR: Certain roles may be subject to U.S. export control laws, requiring U.S. person status as defined by 8 U.S.C. 1324b(a)(3).Please review the job details below.This position requires an active U.S. Government Security Clearance at the TS/SCI level with CI polygraph.Vantor is seeking a Software Engineer to join our team. In this position you will design, develop, integrate, and maintain software applications and services that support Object-Based Intelligence (OBI) mission requirements, enterprise ontologies, and knowledge graph capabilities. The Software Engineer serves as a key contributor to the design, development, and sustainment of mission-critical software solutions that enable semantic data integration, knowledge management, and advanced analytics. 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. Working 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.Responsibilities:Design, develop, test, deploy, and maintain software applications and microservices supporting Object-Based Intelligence mission requirements.Develop APIs and backend services that integrate with enterprise ontologies, knowledge graphs, semantic databases, and object-management systems.Implement software solutions that leverage Semantic Web technologies, including RDF, OWL, SPARQL, and graph-based data models, to enable advanced search, reasoning, and data interoperability.Collaborate with ontology engineers, database engineers, data scientists, analysts, and Government stakeholders to translate mission requirements into scalable software solutions.Design and develop secure, containerized applications using modern software engineering practices and cloud-native technologies.Integrate heterogeneous data sources through RESTful APIs, messaging services, and data integration frameworks to support enterprise knowledge management.Develop automated unit, integration, and system tests while supporting continuous integration and continuous deployment (CI/CD) pipelines.Optimize application performance, scalability, and reliability to support high-volume mission operations and advanced analytics.Participate in Agile development activities, including sprint planning, code reviews, technical design sessions, and backlog refinement.Produce and maintain software design documentation, interface specifications, API documentation, and technical implementation guides.Support AI/ML initiatives by developing software services that enable access to semantic data, knowledge graphs, and contextual reasoning capabilities.Provide technical leadership, mentoring, and knowledge transfer activities to Government personnel and project team members on software engineering best practices.Minimum Qualifications:Must be a U.S. citizen and have an active TS/SCI with CI polygraph.12 years of experience and an advanced degree or 17 years of experience with a bachelor's degree.Demonstrated experience designing, developing, and maintaining enterprise software applications using modern programming languages such as Java, Python, or C#.Experience developing RESTful APIs, microservices, and distributed applications.Experience integrating applications with relational databases, graph databases, or semantic data platforms.Experience with containerization technologies such as Docker and Kubernetes/OpenShift.Familiarity with Agile software development methodologies, DevSecOps practices, and CI/CD pipelines.Experience with version control systems such as Git.Ability to communicate complex technical concepts effectively to both technical and non-technical stakeholders.Preferred Qualifications:Experience supporting Object-Based Intelligence, Intelligence Community, or Department of Defense mission systems.Experience developing applications that leverage Semantic Web technologies, including RDF, OWL, SPARQL, knowledge graphs, or graph databases.Experience integrating AI/ML services, large language models (LLMs), or advanced analytics capabilities into enterprise applications.Experience with cloud-native application development using AWS, Azure, or Red Hat OpenShift.Experience implementing secure software development practices in accordance with Government cybersecurity requirements.Experience with event-driven architectures, message brokers, and enterprise integration frameworks.AWS Certified Developer, Microsoft Certified: Azure Developer Associate, Red Hat Certified Specialist, Security+, or equivalent software engineering certification.Experience providing technical leadership, mentoring, and formal knowledge transfer to Government personnel or large multidisciplinary teams.#cjpost#LI-CJ1#LI-OnsitePay Transparency: To support pay transparency, Vantor includes salary ranges in all U.S. job postings. Starting pay for this role will fall within the listed range and will be based on factors such as experience, qualifications, skills, location, and market conditions. Candidates who meet the minimum requirements for the role should not expect to receive compensation at the top of the range. The listed range reflects the expected pay for this position, and final offers will be determined based on each candidate’s experience, expertise, and alignment with the role. The base pay for this position within the Washington, DC metropolitan area is: $165,000.00 - $220,000.00 - $242,000.00 annually.For all other states, we use geographic cost of labor as an input to develop market-driven ranges for our roles, and as such, each location where we hire may have a different range. Benefits: Vantor offers a competitive total rewards package that goes beyond the standard, including a robust 401(k) with company match, mental health resources, and unique perks like student loan repayment assistance, adoption reimbursement and pet insurance to support all aspects of your life. You can find more information on our benefits at: The application window is three days from the date the job is posted and will remain posted until a qualified candidate has been identified for hire. If the job is reposted regardless of reason, it will remain posted three days from the date the job is reposted and will remain reposted until a qualified candidate has been identified for hire. The date of posting can be found on Vantor's Career page at the top of each job posting.To apply, submit your application via Vantor's Career page.EEO Policy: Vantor is an equal opportunity employer committed to an inclusive workplace. We believe in fostering an environment where all team members feel respected, valued, and encouraged to share their ideas. All qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, sex, gender identity, sexual orientation, disability, protected veteran status, age, or any other characteristic protected by law.SummaryLocation: Herndon, VAType: Full time