Information Systems Security Officer (ISSO)

Please Note: To conform with the United States Government Space Technology Export Regulations, the applicant must be a U.S. citizen, lawful permanent resident of the U.S., conditional resident, asylee or refugee (protected individuals as defined by 8 U.S.C. 1324b(a)(3)), or eligible to obtain the required authorizations from the U.S. Department of State.
At CesiumAstro, we are developers and pioneers of out-of-the-box communication systems for satellites, UAVs, launch vehicles, and other space and airborne platforms. We take pride in our dynamic and cross-functional work environment, which allows us to learn, develop, and engage across our organization. If you are looking for hands-on, interactive, and autonomous work, CesiumAstro is the place for you. We are actively seeking passionate, collaborative, energetic, and forward-thinking individuals to join our team.

We are seeking an Information Systems Security Officer to assist with the development, implementation, and maintenance of our information security strategy.

The Information Systems Security Officer (ISSO) is responsible for supporting the execution, maintenance, and continuous monitoring of information system security controls for classified and unclassified systems within an aerospace and defense environment. This role supports compliance with DoD cybersecurity requirements including NIST SP 800-53, NIST SP 800-171, RMF, and CMMC Level 2.

The ISSO works under the direction of the ISSM and serves as a contributing team member, providing hands-on system security support, assisting with authorization and accreditation activities, and supporting ongoing compliance monitoring.

JOB DUTIES AND RESPONSIBILITIES

• Assist with implementation and maintenance of security controls in accordance with NIST SP 800-53, NIST SP 800-171, RMF, and CMMC requirements.
• Support system authorization activities including SSPs, POA&Ms, and security documentation.
• Perform vulnerability tracking and support remediation efforts.
• Support internal and external audits, assessments, and customer reviews.
• Provide support for classified systems and SCIF environments under ISSM guidance.
• Ensure adherence to classified system handling, marking, and access control requirements.
• Assist with SCIF sustainment and compliance activities.
• Assist in identifying, assessing, and documenting cybersecurity risks.
• Support cybersecurity incident response, reporting, and remediation activities.
• Participate in configuration change reviews to assess security impact.
• Partner with IT, engineering, and program teams to support secure system operations.
• Provide guidance to users on cybersecurity policies and procedures.
• Support onboarding of systems and technologies into compliant environments.
• Maintain accurate system security documentation.
• Track compliance metrics and support audit readiness.
• Contribute to continuous improvement of cybersecurity processes.

JOB REQUIREMENTS AND MINIMUM QUALIFICATIONS

• Bachelor’s degree in Information Security, Computer Science, Engineering, or a related field, or equivalent practical experience.
• Minimum of 2 years of experience in information system security, cybersecurity compliance, or ISSO-related roles within aerospace, defense, or government environments.
• Experience supporting CMMC Level 2 compliance.
• Experience supporting classified and unclassified information systems in a DoD or aerospace and defense environment.
• Understanding of system authorization, continuous monitoring, and risk management processes.
• Understanding of cybersecurity compliance and risk management principles.
• Familiarity with SCIF operations and classified system security requirements.
• Exposure to vulnerability scanning and assessment tools, security monitoring and logging tools, and GRC and compliance tools (e.g., eMASS or equivalent).
• Working knowledge of of NIST SP 800-171, NIST SP 800-53 and RMF concepts.
• Experience with Microsoft Office Suite (Word, Excel, PowerPoint, Outlook).
• Strong analytical, documentation, and communication skills.
• Ability to operate independently while collaborating effectively with cross-functional teams.
• Must be eligible to obtain and maintain a security clearance.

PREFERRED EXPERIENCE

• Experience supporting NIST SP 800-171 or CMMC Level 2 compliance is preferred.
• Active U.S. DoD Secret clearance and DoD 8140 certification are not required but considered a plus.

This job does not provide relocation assistance.
CesiumAstro considers several factors when extending an offer, including but not limited to, the role and associated responsibilities, a candidate’s work experience, education/training, and key skills. Full-time employment offers include company stock options and a generous benefits package including health, dental, vision, HSA, FSA, life, disability and retirement plans. CesiumAstro is an Equal Opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, protected Veteran Status, or any other characteristic protected by applicable federal, state, or local law.
Please note: CesiumAstro does not accept unsolicited resumes from contract agencies or search firms. Any unsolicited resumes submitted to our website or to CesiumAstro team members will be considered property of CesiumAstro, and we will not be obligated to pay any referral fees.