Castellum Inc.

Senior Data Scientist – Semantic Ontologies

Castellum Inc.

full-time

Posted on:

Location Type: Office

Location: Fort BelvoirVirginiaUnited States

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Salary

💰 $155,000 - $165,000 per year

Job Level

Tech Stack

About the role

  • Work with Army stakeholders to identify opportunities for leveraging data to drive operational and strategic solutions.
  • Design and develop semantic models and ontologies using OWL, RDF, and SHACL to represent complex mission concepts.
  • Build, query, and maintain knowledge graphs (Neo4j, JanusGraph, Vantage, ADVANA) to capture relationships among entities.
  • Mine and analyze structured/unstructured datasets to identify trends, correlations, and mission-relevant insights.
  • Develop predictive models, simulations, and algorithms to support operational decision-making.
  • Perform ETL processes to integrate and validate data from multiple Army and enterprise sources.
  • Visualize and present findings to stakeholders using dashboards, reports, and knowledge graph queries.
  • Coordinate with cross-functional and joint teams to implement models and monitor outcomes.

Requirements

  • 5–7 years of experience manipulating datasets, building statistical models, and applying advanced analytics.
  • Master’s or PhD in Statistics, Mathematics, Computer Science, Data Science, or a related quantitative field.
  • Experience designing and implementing semantic models and knowledge graphs.
  • Active Secret-level security clearance.
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
data manipulationstatistical modelingadvanced analyticssemantic modelsontologiesknowledge graphspredictive modelingETL processesdata visualizationalgorithm development
Soft Skills
stakeholder engagementcross-functional collaborationcommunicationanalytical thinkingproblem-solving
Certifications
Master’s degreePhDSecret-level security clearance