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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Principal Software Engineer - **Company:** Vantor Inc. - **Location:** Herndon, VA, United States - **Experience:** Expert - **Salary:** $165,000.0 - $220,000.0 - **Contract:** Permanent contract - **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Agile Methodology, Artificial Intelligence, Amazon Web Services, Application Integration Architecture, Application Performance Management, Application Services, Microsoft Azure, C Sharp (Programming Language), Cloud Engineering, Code Review, Databases, Continuous Integration, Data Integration, Relational Databases, Distributed Systems, Graph Database, Design of User Interfaces, Interoperability, Python (Programming Language), Enterprise Messaging Systems, Object-Oriented Software Development, OpenShift, Scrum Methodology, Red Hat Enterprise Linux, Regression Testing, Azure Machine Learning, Search Technologies, Semantic Web, Software Engineering, Software Systems, SPARQL, Systems Integration, Software Technical Review, Openapi, Enterprise Data Management, Enterprise Software Applications, Large Language Models, Software Application Programming, Backend, Git, Containerization, Restful APIs, Software Version Control, Devsecops, Docker, Microservices - **Published:** October 15, 2026 - **Apply:** https://www.clearancejobs.com/jobs/9243486/principal-software-engineer ## About the Role * Must be a U.S. citizen and have an active TS/SCI with CI polygraph. * 10 years of experience and an advanced degree or 15 years of experience with a bachelor's degree. * Demonstrated experience developing enterprise software applications using Java, Python, C#, or comparable object-oriented programming languages. * Experience developing RESTful APIs, microservices, and distributed applications. * Experience integrating applications with relational databases, graph databases, or enterprise data platforms. * Experience with containerization technologies such as Docker and Kubernetes/OpenShift. * Familiarity with Agile software development methodologies, DevSecOps practices, CI/CD pipelines, and Git-based version control. * Ability to communicate complex technical concepts effectively to technical and non-technical stakeholders., * Experience supporting Object-Based Intelligence, Intelligence Community, or Department of Defense mission systems. * Experience developing applications that integrate with enterprise ontologies, knowledge graphs, or Semantic Web technologies, including RDF, OWL, and SPARQL. * Experience with cloud-native application development using AWS, Azure, or Red Hat OpenShift. * Experience integrating AI/ML services, large language models (LLMs), or advanced analytics capabilities into enterprise applications. * Experience implementing secure software development practices in accordance with Government cybersecurity requirements and RMF principles. * AWS Certified Developer, Microsoft Certified: Azure Developer Associate, Red Hat Certified Specialist, Security+, or equivalent software development certification. * Experience mentoring developers and providing technical leadership within Agile software development teams. Pay 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. ## Description Vantor is seeking a Principal Developer to join our team. In this position you will design, develop, and maintain mission-critical applications that support Object-Based Intelligence (OBI) mission requirements, enterprise ontologies, knowledge graphs, and semantic data integration., The Senior Developer serves as a senior technical contributor responsible for developing secure, scalable, and maintainable software solutions that enable semantic data integration, object management, and advanced analytics. This position develops application services, APIs, user interfaces, and backend components that leverage enterprise ontologies, knowledge graphs, and Semantic Web technologies to support data interoperability and mission workflows. Working within an Agile DevSecOps environment, the Senior Developer collaborates with ontology engineers, software engineers, database engineers, data engineers, and Government stakeholders to deliver high-quality software that supports operational mission requirements., * Design, develop, test, deploy, and maintain enterprise software applications supporting Object-Based Intelligence mission requirements. * Develop scalable backend services, RESTful APIs, and user-facing applications that integrate with ontology services, knowledge graphs, semantic databases, and enterprise data platforms. * Implement software solutions utilizing Semantic Web technologies, including RDF, OWL, and SPARQL, to support semantic search, data integration, and knowledge discovery. * Collaborate with ontology engineers, database engineers, data engineers, analysts, and Government stakeholders to translate mission requirements into software solutions. * Develop secure, containerized applications using modern software engineering principles and cloud-native technologies. * Integrate applications with relational databases, graph databases, messaging systems, and enterprise APIs to enable seamless access to mission data. * Participate in Agile development activities, including sprint planning, technical design reviews, code reviews, and backlog refinement. * Develop automated unit, integration, and regression tests while supporting continuous integration and continuous deployment (CI/CD) pipelines. * Troubleshoot and resolve software defects, optimize application performance, and ensure application scalability, reliability, and security. * Produce and maintain software design documentation, API specifications, technical implementation guides, and operational documentation. * Support AI/ML initiatives by developing software services that provide access to semantic data, contextual knowledge, and enterprise analytics capabilities. * Mentor junior developers and provide technical guidance to project team members while supporting knowledge transfer activities with Government personnel.