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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Systems Administrator-Information Systems Security Officer Senior - **Company:** CASTALIA SYSTEMS LLC - **Location:** United States - **Experience:** Expert - **Salary:** $137,700.0 - $145,800.0 - **Contract:** Permanent contract - **Skills:** Public-Key Cryptography, Cyber Security, Information Systems, Identity and Access Management, Information Security Management, Information Systems Security Architecture Professional, Microsoft Security Essentials, Cisco - **Published:** July 17, 2026 - **Apply:** https://www.dice.com/job-detail/9a2085de-afb7-44bf-b9c2-dc6c9ad8a315 ## About the Role * MA/MS degree and 10+ years of experience or Bachelor's degree and 18+ years of experience in a professional work environment or Associate's degree and 22+ years of experience in a professional work environment, or HS diploma or GED and 22+ years of experience in a professional work environment. * IAM Level I and/or Level II certification, at least one of the following certifications: CAP (Certified Authorization Professional), CASP+ (CompTIA Advanced Security Practitioner), CISM (Certified Information Security Manager), CISSP (Certified Information Systems Security Professional), GSLC (GIAC Security Leadership Certification). * 3+ years of experience as an ISSO Information Assurance Technical (IAT) supporting or Information Assurance Management (IAM). * Experience with integrating MI Systems with other warfighting functions such as Fires, Mission Command, Signal, Electronic Warfare, etc., on multiple classification networks. * Experience developing technological responses with recommendations to prevent, reduce, detect, and respond to cyberspace threats. * Ability to conduct research and analysis of actionable cyberspace threats requiring a rapid response. Assess information security for classified activities. * Ability to conduct research and assessments to develop and update system security outlining security operating procedures. * Ability to access National Security Agency Network and Communications Security Information. * Ability to provide NE and advanced level Computer Environment (CE) support. Preferred Qualifications * Experience as an ISSM, ISSE, or SCA supporting classified programs. * Experience completing certification and accreditation packages and requirements via the Enterprise Mission Assurance Support Service (eMASS) system for RMF documentation submission. * Ability to perform security inspections, validate clearances, performing certifications and cyber awareness training. * Ability to assist with the issuance of Public Key Infrastructures (PKIs). * Ability to prepare Body of Evidence for Authorization/Assessment activities to receive Approval to Connect/Operate. * Master's Degree. * Security+, GIAC Security Essentials (GSEC), or Cisco Certified Network Associate (CCNA-Security). Physical Requirements/Work Environment * Normal office environment. Travel * Ability to travel to other CONUS and OCONUS sites as needed. ## Description Castalia Systems is seeking a Senior Systems Administrator/Information Systems Security Officer to support our client with full lifecycle support to risk management and analysis on intelligence networks and systems to identify capability gaps, threats, vulnerabilities and provide other technical support as required., * Provide full lifecycle support to risk management and analysis on intelligence networks and systems to identify capability gaps, threats, vulnerabilities and provide other technical support as required. * Be a technical leader and support Enterprise activities and customers throughout multiple classified computing domains. * Responsible for ensuring all Information System Security policies, standards, and directives are enforced to support assessment, authorization and continued operation of information systems processing classified information. * Define security expectations, drive the remediation of vulnerabilities, and collaborate across multidisciplinary teams to ensure systems remain authorized, protected, and mission ready. ## Related Videos - [Security Pitfalls for Software Engineers](https://www.wearedevelopers.com/videos/726-security-pitfalls-for-software-engineers) - [Microservices? 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