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Castellum Inc. Logo

Data Scientist Senior Level

Castellum Inc.

Salary not specified
Sep 6, 2025
Fort Belvoir, VA, US
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Support the Army G-6 with advanced semantic modeling, ontology development, and quantitative data analysis to optimize mission operations and improve decision-making.

Requirements

  • Proficiency in statistical computer languages (Python, R, SQL) for data manipulation and analysis.
  • Experience working with and creating data architectures, including semantic/ontology-driven frameworks.
  • Knowledge of machine learning techniques (clustering, regression, neural networks, decision trees) and their real-world applications.
  • Familiarity with semantic technologies and tools: RDF, OWL, SHACL, Protégé.
  • Experience with graph databases and query languages: Neo4j, JanusGraph, SPARQL, Cypher.
  • Hands-on experience with ETL processes and distributed data/computing tools (Hadoop, Spark, Hive, NiFi).
  • Strong skills in data visualization (Tableau, Power BI, Matplotlib, Seaborn, ggplot).

Responsibilities

  • 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.

Other

  • Work with Army stakeholders to identify opportunities for leveraging data to drive operational and strategic solutions.
  • 5–7 years of experience manipulating datasets, building statistical models, and applying advanced analytics.
  • Active Top Secret-level security clearance.
  • Excellent written and verbal communication for coordination across Army, joint, and interagency teams.
  • Strong problem-solving skills with an emphasis on mission-focused data science.