Senior Ngo Software Engineer Jobs in Reston, VA (NOW HIRING)

Who we are. Platinum Technologies is a Northern Virginia based integrated solutions firm that specializes in Cybersecurity, Cloud and Digital Services to the Public Sector. Our team solves hard problems and helps our Mission Partners achieve their goals. If you are self-motivated, possess demonstrated learning agility, and are passionate about delivering high-quality work products - we want to hear from you. We lead with technical expertise, but that is just the tip of the iceberg - the 'Why' matters. At Platinum, we don't hire people to do a job. We provide professional and leadership development to complement our self-motivated domain experts. Our teammates are dot-connecting leaders that operate in a mutually accountable environment to deliver thought leadership, expert technical analysis, and quality execution for our clients.

This position requires an active U.S. Government Security Clearance at the TS/SCI level with CI polygraph. Platinum Technologies is seeking a Senior 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 Senior 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.

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.

Must be a U.S. citizen and have an active TS/SCI with CI polygraph.

Minimum twelve (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.

The Company is an Equal Opportunity/Affirmative Action employer. All qualified candidates will receive consideration for employment without regard to disability, protected veteran status, race, color, religious creed, national origin, citizenship, marital status, sex, sexual orientation/gender identity, age, or genetic information.