Castellum Inc

Castellum Inc seeks a PKI Engineer within our Defense & Aerospace-focused IT & Cybersecurity team. You will design, implement, and manage enterprise PKI services securing classified and mission-critical environments. Responsibilities include CA/RA administration, certificate policy/CP-CPS development, key lifecycle management, TLS/SSL integration, and HSM operations. Collaborate with cybersecurity, network, and application teams to enforce cryptographic standards, support audits, and resolve certificate incidents. Castellum offers a dynamic, inclusive culture focused on innovation in defense tech and professional growth.

Castellum Inc. seeks a Software Engineer to design, develop, and secure mission-critical applications supporting U.S. defense and national security customers. You will build reliable, high-performance software and services, integrate with cyber and electronic warfare systems, and apply secure coding practices across the SDLC. Working in agile teams, you'll collaborate with engineers, analysts, and mission experts to translate operational needs into robust technical solutions. This role offers exposure to cutting-edge defense technologies, disciplined yet entrepreneurial culture, and clear paths for advancement in a fast-growing, acquisition-driven environment.

Castellum Inc. seeks a Systems Analyst to support critical national security and defense missions for federal and military customers. In this role, you will analyze, document, and optimize complex IT and cybersecurity systems, translating mission needs into technical requirements. You'll assess system performance, identify gaps, and recommend secure, scalable solutions across networks, applications, and data workflows. Working with engineers, cybersecurity specialists, and mission owners, you'll support system integration, testing, and accreditation activities. This position offers exposure to advanced cyber, electronic warfare, and secure IT technologies in a mission-focused, collaborative, and growth-oriented environment.

Castellum Inc. seeks a Program Analyst to support cybersecurity and defense missions for U.S. federal and military customers. In this role, you will analyze program performance, requirements, schedules, and costs to improve delivery of secure IT and advanced engineering solutions. You will prepare reports and dashboards, track milestones and risks, and support proposals and customer briefings. Working closely with mission-focused teams, you will translate technical data into actionable insights, help optimize resources, and contribute to high-impact national security programs in a fast-paced, growth-oriented environment.

Castellum Inc, a defense-oriented technology company, seeks a Red Hat Platform Engineer to design, secure, and optimize Red Hat-based environments for mission-critical defense and cybersecurity systems. In this dynamic Information Technology role, you will architect and maintain RHEL and related platforms, leveraging automation (Ansible, CI/CD) to standardize deployments, patching, and configuration management. You will harden systems to DoD and industry security standards, support OpenShift/Kubernetes infrastructure, and collaborate with cybersecurity and development teams to ensure resilient, compliant, and high-performing services. Operating in a dynamic, inclusive culture focused on innovation in defense tech, you will help drive continuous improvement, document best practices, and support incident response and root-cause analysis. Castellum offers competitive compensation, comprehensive benefits, and growth opportunities in cutting-edge information and electronic warfare technologies.