Sr Data Scientist - Semantic Ontologies jobs in United States
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Castellum · 9 hours ago

Sr Data Scientist - Semantic Ontologies

positionFort Belvoir, VA
timeFull-time
remoteOnsite
senioritySenior Level
money$155K/yr - $165K/yr
date5+ years exp

Castellum Inc is seeking a senior-level Data Scientist to support the Army G-6 with advanced semantic modeling and quantitative data analysis. The role involves leveraging large datasets to optimize mission outcomes and designing semantic models and knowledge graphs for decision-making across Army operational domains.

Commercial Real EstateMarketingProperty ManagementReal EstateSales
badNo H1BnoteSecurity Clearance RequirednoteU.S. Citizen Onlynote

Responsibilities

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

Qualification

Semantic modelingOntology developmentData analysisStatistical modelingPythonRSQLMachine learningGraph databasesETL processesData visualizationCommunication skills

Required

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
Strong problem-solving skills with an emphasis on mission-focused data science
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)
Excellent written and verbal communication for coordination across Army, joint, and interagency teams

Company

Castellum

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Castellum is one of the largest listed real estate companies in Sweden.
dateFounded in 1993
location
Göteborg, Vastra Gotaland, SWE
people-size501-1000 employees
web-link
https://www.castellum.se/

Funding

Current Stage
Public Company
Total Funding
$552.43M
2024-09-03Post Ipo Debt· $552.43M
2004-10-08IPO

Recent News

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Castellum subsidiary awarded $66.2M contract
2025-11-01
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Castellum reports higher vacancy rates and declining asset values
2025-07-15
Seeking Alpha
Castellum prices $5M public offering of units; shares down 11%
2025-06-12
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