Castellum Inc.

Data Scientist

• Partner with cross-functional stakeholders to deliver actionable insights
• Mine and analyze data from databases to drive optimization in product development and marketing
• Develop custom data models and algorithms
• Use predictive modeling to increase customer experiences and revenue generation
• Coordinate with functional teams to implement models and monitor outcomes
• Develop processes to monitor and analyze model performance

Senior Data Scientist

• 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.

Senior Data Scientist – Semantic Ontologies

Full-stack Engineer

• Perform software engineering tasks supporting ALRE and mission-critical software-intensive systems
• Develop, modify, debug, and test software applications primarily using C#
• Support lab and operational site-based system testing
• Support Agile development practices including sprint planning, tasking, and iterative delivery
• Create and execute software unit and integration tests and document results in accordance with program standards
• Support software integration, verification, and validation activities in Windows and Linux environments
• Support software/hardware and system integration, verification, and validation testing
• Assist with troubleshooting issues across development, test, and operational environments and provide technical recommendations
• Produce technical documentation and formal reporting as required
• Participate in technical meetings, reviews, and Integrated Product Team (IPT) collaboration with Government and contractor personnel
• Comply with applicable processes and guidance including government security and mission requirements

Software Engineer

Payroll

• Manage and oversee end-to-end payroll processing for all employees across multiple legal entities and states
• Ensure payroll is processed accurately, timely, and in compliance with federal, state, and local regulations
• Review and approve payroll registers, payroll tax filings, and related journal entries
• Maintain payroll records including earnings, deductions, benefits, garnishments, and taxes
• Ensure compliance with FAR, DFARS, DCAA, and other government-contracting payroll requirements, as applicable
• Coordinate payroll tax filings, reconciliations, and year-end activities including W-2s and state filings
• Serve as the primary point of contact for payroll audits, internal reviews, and external inquiries
• Partner with HR and Accounting to ensure accurate employee setup, benefits deductions, and general ledger integration
• Lead payroll-related aspects of acquisitions, including system integration, data conversion, and process harmonization
• Develop, document, and enhance payroll policies, procedures, and internal controls
• Identify opportunities to improve efficiency, automation, and scalability of payroll processes
• Supervise, mentor, and develop payroll staff as applicable
• Maintain strict confidentiality of payroll and employee information
• Support general accounting activities and cross-functional initiatives as needed

Senior Data Scientist

Senior Data Scientist – Semantic Ontologies

Software Engineer

Payroll Manager