Castellum Inc.

Security Engineer

• Support implementation of the DoD Risk Management Framework (RMF) process for Navy information systems.
• Assist in development and maintenance of RMF documentation.
• Assist with system categorization, control selection, and implementation validation in accordance with NIST SP 800-53.
• Coordinate with Authorizing Officials (AO), ISSMs, ISSOs, and system owners to support ATO packages.
• Monitor cybersecurity vulnerabilities and assist with remediation planning.
• Track vulnerabilities and corrective actions through POA&M management.
• Assist with enforcement of DoD and Navy cybersecurity policies.
• Develop and update software requirements, design documents, and test procedures.
• Working closely with system administrators, developers, and network engineers to implement cybersecurity controls.

Information Security Officer

Network Engineer

• Install, configure, and maintain network infrastructure including routers, switches, firewalls, and network appliances supporting Navy lab and integration environments.
• Manage VLANs, subnetting, routing, and network segmentation to support isolated test networks and secure development environments.
• Monitor network performance, troubleshoot connectivity issues, and ensure high availability of lab infrastructure supporting development and test activities.
• Implement and maintain network configurations supporting both Windows and Linux systems across development, staging, and test environments.
• Support network configurations required for hardware-in-the-loop (HITL), system integration labs, and simulation environments.
• Configure network segmentation and isolated environments to support cyber testing, vulnerability assessments, and system validation.
• Maintain network diagrams, configuration documentation, and operational procedures.
• Must maintain certifications to monitor/manage all relevant accreditations within lab environment.

Network Administrator

System Administrator

• Install, configure, and maintain Windows Server and Linux operating systems in development, integration, test, and production environments
• Perform system monitoring, performance tuning, and troubleshooting to maintain high system availability
• Administer user accounts, permissions, and group policies across enterprise systems
• Manage server patching, updates, and system lifecycle maintenance
• Vulnerability Management & Continuous Monitoring
• Support virtualized environments (VMware, Hyper-V, or similar platforms)
• Manage storage allocation, system backups, and disaster recovery procedures
• Maintain system documentation, architecture diagrams, and configuration baselines
• Support integration of systems into secure Navy networks and enclaves
• Collaborate with developers, cybersecurity personnel, and engineers to support application hosting environments
• Assist with infrastructure support for DevSecOps pipelines and containerized environments where applicable
• Provide technical recommendations for system improvements, modernization, and performance optimization
• Must maintain certifications to monitor/manage all relevant accreditations within lab environment

Systems Administrator

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

Information Security Officer

Network Administrator

Systems Administrator

Senior Data Scientist