Information System Security Officer (ISSO)

Information System Security Officer (ISSO) Employment Type: Full-Time, Mid-Level. Department: Administrative and Logistics Support. As a FSR ISSO, you will be embedded on‑site with U.S. Government customers to ensure the secure, compliant operation of a production‑grade data and application platform used in mission‑critical environments. You will act as the primary authority for system security and compliance, working hands‑on with live systems while partnering closely with engineers, operators, and customer security teams. Skills and attributes for success Act as the primary on‑site point of contact for security and compliance requirements across one or more U.S. Government customers. Support system accreditation and authorization activities using frameworks such as RMF or DIACAP. Collaborate with software, systems, and field engineers to ensure required security controls, configurations, and policies are correctly implemented. Analyze deployed software implementations and assess alignment with applicable security requirements. Build, standardize, and maintain security documentation, including SSPs, POA&Ms, control narratives, and supporting artifacts. Generate, validate, and organize evidence of compliance once security settings are applied. Assemble accreditation artifacts into a structured, auditable repository. Support audits, assessments, and ongoing compliance activities throughout the system lifecycle. Maintain the ongoing security and trust of customers through hands‑on system access and coordination with engineering and operations teams. Support software operating across AWS, Azure, on‑premises, and at multiple classification levels. Operate in environments where the platform, threat landscape, and operational needs are continuously evolving. Qualifications Background in systems administration, software development, systems engineering, or deep familiarity with Linux‑based systems. Experience accrediting IT systems against U.S. Government standards such as NIST SP 800‑53, CNSSI 1253, and DISA STIGs. Hands‑on experience supporting accreditation using eMASS or Xacta. Experience collaborating with engineering teams to implement and validate security configurations. Understanding of configuration management and automation tools (e.g., Puppet, Terraform, CloudFormation, Chef, Ansible). Comfort using version control systems such as Git. Ability to independently use vulnerability scanning tools such as Nessus and OpenSCAP. Experience working in cloud and on‑premises environments, including AWS. Strong ability to produce clear, concise technical documentation, stay organized, and maintain attention to detail. Curiosity, critical thinking, and the ability to evaluate real‑world implementations against formal security requirements. Active TS/SCI Clearance or Eligibility. Benefits Health, Dental, and Vision Life Insurance 401k Flexible Spending Account (Health, Dependent Care, and Commuter) Paid Time Off and Observance of State/Federal Holidays Contact Government Services, LLC is an Equal Opportunity Employer. Applicants will be considered without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran. #J-18808-Ljbffr