Senior Software Engineer – Semantic Web & Knowledge Graphs

Doist; Herndon (VA); On-site; USD 140,000 - 180,000; Full time

Job summary

Platinum Technologies, a Northern Virginia–based solutions firm, is seeking a Senior Software Engineer to design, develop, and sustain software for Object-Based Intelligence missions. You will build scalable applications, APIs, and microservices that leverage ontologies and knowledge graphs, in an Agile DevSecOps environment.

You will work with ontology and database engineers, data scientists, and government stakeholders to deliver secure, high‑performing software using RDF, OWL, SPARQL, and

Qualifications

• U.S. citizen with active TS/SCI clearance required.
• Minimum 12 years of software development experience; 17+ years with a bachelor's degree.
• Extensive experience designing and maintaining enterprise software using Java, Python, or C#.
• Experience building RESTful APIs, microservices, and distributed applications.
• Experience with relational, graph, or semantic databases; knowledge graphs.
• Proficiency with containerization (Docker) and Kubernetes/OpenShift.
• Familiarity with Agile software development methodologies, DevSecOps, and CI/CD.
• Ability to communicate complex technical concepts to technical and non-technical stakeholders.

Responsibilities

• Design, develop, test, deploy, and maintain software applications and microservices for OBI missions.
• Develop APIs and backend services integrating ontologies, knowledge graphs, semantic databases.
• Implement solutions using RDF, OWL, SPARQL for search and data interoperability.
• Collaborate with ontology engineers, database engineers, data scientists, analysts, and Government stakeholders to translate 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.
• Develop automated unit, integration, and system tests with CI/CD pipelines.
• Optimize performance, scalability, and reliability for high-volume mission operations.
• Provide technical leadership, mentoring, and knowledge transfer to Government personnel.

Skills

Java

Python

C#

RESTful APIs

Microservices

Docker

Kubernetes

OpenShift

Git

Agile DevSecOps

CI/CD

Semantic Web

OWL

SPARQL

Communication

Education

Bachelor's degree

Advanced degree

Tools

Docker

Kubernetes/OpenShift

Git

Job description

Platinum Technologies, a Northern Virginia–based solutions firm, is seeking a Senior Software Engineer to design, develop, and sustain software for Object-Based Intelligence missions. You will build scalable applications, APIs, and microservices that leverage ontologies and knowledge graphs, in an Agile DevSecOps environment.

You will work with ontology and database engineers, data scientists, and government stakeholders to deliver secure, high‑performing software using RDF, OWL, SPARQL, and