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1d ago

Senior Ontology Developer

Vantor Services Inc. Herndon, VA

Herndon, VA

1d ago

$140k - $206k/yr Full time Backend Developer Senior APIs

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Job Description

Senior Ontology Developer to design and build secure, mission-focused software services, APIs, and semantic data capabilities for Object-Based Intelligence (OBI) requirements.

Responsibilities

Design, develop, test, deploy, and maintain enterprise software applications aligned to Object-Based Intelligence mission requirements.
Build scalable backend services, RESTful APIs, and user-facing applications integrating ontology services, knowledge graphs, semantic databases, and enterprise data platforms.
Implement solutions using RDF, OWL, and SPARQL to support semantic search, data integration, and knowledge discovery.
Work with ontology engineers, database engineers, data engineers, analysts, and Government stakeholders to convert mission requirements into software deliverables.
Create secure, containerized applications using modern software engineering practices and cloud-native technologies.
Integrate with relational databases, graph databases, messaging systems, and enterprise APIs to enable access to mission data.
Participate in Agile DevSecOps activities, including sprint planning, technical design reviews, code reviews, and backlog refinement.
Develop automated unit, integration, and regression tests; support CI/CD pipeline implementation and delivery.
Troubleshoot defects, optimize performance, and ensure scalability, reliability, and security.
Produce and maintain software design documentation, API specifications, technical implementation guides, and operational documentation.
Support AI/ML initiatives by building services that expose semantic data, contextual knowledge, and enterprise analytics capabilities.
Provide mentorship to junior developers and support technical guidance and knowledge transfer with Government personnel.

Requirements

U.S. citizenship required.
Active TS/SCI with CI polygraph.
Experience: 10 years with an advanced degree, or 15 years with a bachelor’s degree (as applicable to the experience requirement).
Demonstrated enterprise software development 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.
Containerization experience with Docker and Kubernetes/OpenShift.
Familiarity with Agile, DevSecOps, CI/CD, and Git-based version control.
Ability to communicate complex technical concepts to both technical and non-technical stakeholders.

Technologies

Java, Python, C#, RESTful APIs, microservices
RDF, OWL, SPARQL, Semantic Web technologies
Docker, Kubernetes, OpenShift, Git, CI/CD
Unit tests, integration tests, regression tests
Relational databases, graph databases, messaging systems
AI/ML, enterprise ontologies, knowledge graphs, semantic data integration
Containerized applications, cloud-native technologies
AWS, Azure, Red Hat OpenShift
RMF principles, LLMs (large language models)

Preferred Qualifications

Experience supporting Object-Based Intelligence, Intelligence Community, or Department of Defense mission systems.
Experience integrating applications with enterprise ontologies, knowledge graphs, or Semantic Web technologies (RDF, OWL, SPARQL).
Experience with cloud-native application development using AWS, Azure, or Red Hat OpenShift.
Experience integrating AI/ML services, LLMs, or advanced analytics capabilities into enterprise applications.
Experience implementing secure software development practices aligned with Government cybersecurity requirements and RMF principles.
Certifications such as AWS Certified Developer, Microsoft Certified: Azure Developer Associate, Red Hat Certified Specialist, Security+, or equivalent.
Experience mentoring developers and providing technical leadership within Agile software development teams.

Benefits

Robust 401(k) with company match
Mental health resources
Student loan repayment assistance
Adoption reimbursement
Pet insurance

Location

Herndon, VA (onsite)

Compensation

Base pay: $140,000.00 - $187,000.00 - $205,700.00 annually (Washington, DC metropolitan area range)
For other states, geographic cost of labor is used to develop market-driven ranges, so ranges may differ by location.

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).

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1mo ago

Senior Software Engineer – MAVEN (Hybrid)

JFL Consulting LLC Springfield, VA

Springfield, VA

1mo ago Closed

$170k - $250k/yr Full time Senior APIs Build Tools

This position is no longer accepting applications (closed Aug 19, 2026).

Job Description

Senior Software Engineer – MAVEN (Hybrid) at JFL Consulting LLC, based in Springfield, VA with a hybrid on-site arrangement at a customer site in the DMV area. The role concentrates on developing COP, geospatial visualization, and data integration capabilities using Palantir Foundry and MAVEN Smart System to support critical national security missions. A Secret clearance is required.

Responsibilities

Design and develop common operating picture (COP) and geospatial visualization capabilities.
Build on Palantir Foundry/AIP/MSS where applicable.
Integrate sensor detections, operational data, and real-time data feeds.
Build intuitive analyst workflows and user-facing applications.
Optimize visualization performance for large-scale datasets.

Requirements

Bachelor's degree in computer science/engineering, or related field, or equivalent experience.
8+ years of software engineering experience, including development of geospatial, visualization, or common operating picture (COP) applications.
2+ years of direct experience developing on Palantir Foundry, AIP, or Maven Smart System.
IAT Level II certification (e.g., Security+ CE, CySA+, CCNA Security, GSEC).
Minimum Secret clearance.

Technologies

Palantir Foundry
MAVEN Smart System
MSS
AIP
Esri/ArcGIS
Cesium
Mapbox
TypeScript
React
Python
OWL
RDF

Benefits

Health insurance (medical, dental, and vision premiums)
Life insurance
Short-term disability
Long-term disability
401(k) with immediate vesting of company contribution
Flexible Spending Accounts (healthcare, dependent care, and commuter)
Generous paid time off (vacation, sick, personal days, holidays)
Certification reimbursement
Professional development funding
Access to online learning platforms

Compensation

Salary: USD 170,000 - 250,000 per year

Place of Performance

Customer site in DMV, hybrid schedule

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Senior Ontology Developer

Senior Software Engineer – MAVEN (Hybrid)

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