SIPRNET System Administrator

Basic Qualifications

Bachelor's degree in Computer Science, a related field or equivalent combination of education and relevant work experience is required plus a minimum of 5 years of relevant experience; or Master's degree plus 3 years of relevant experience.

CLEARANCE REQUIREMENTS:Department of Defense Secret security clearance is required at time of hire. Applicants selected will be subject to a U.S. Government security investigation and must meet eligibility requirements for access to classified information. Due to the nature of work performed within our facilities, U.S. citizenship is required.

Responsibilities for this Position

At General Dynamics Mission Systems, we create the technologies, products and services that help our nation’s heroes keep our nation safe. The work we do is so advanced, we are continuously moving the boundaries of what’s possible. Here you’ll work with the best and your talent will be front and center on projects that impact the world. Are you up to the challenge?

The SIPRNET System Administrator is responsible for the day-to-day operation, administration, maintenance, security, and troubleshooting of secure SIPRNET and classified systems environments supporting critical business and customer missions. This position serves as a technical subject matter expert responsible for maintaining highly available, secure, compliant, and operationally ready classified systems across geographically dispersed locations.

The successful candidate will provide hands-on and remote systems administration support across SIPRNET environments, including Windows Server and workstation operating systems, Active Directory, Group Policy, DNS, DHCP, PKI, virtualization platforms, enterprise applications, security tools, and other supporting infrastructure. The administrator will troubleshoot complex technical issues, implement approved configuration changes, support new system deployments, and ensure systems remain compliant with applicable Department of Defense, DISA, NIST, and cybersecurity requirements.

This position requires strong technical knowledge of Windows systems administration, Active Directory, Group Policy, classified systems administration, vulnerability management, configuration management, system hardening, patch management, and Cyber Operational Readiness Assessment (CORA) requirements. The successful candidate must be comfortable working independently, responding to operational issues, supporting multiple concurrent priorities, and clearly communicating technical requirements, instructions, and troubleshooting steps to personnel with varying levels of technical experience, including providing effective remote guidance and support.

Travel will be required to support geographically dispersed SIPRNET environments, system deployments, maintenance activities, inspections, and customer requirements.

Key Responsibilities

Provide day-to-day operation, administration, maintenance, and troubleshooting of secure Windows-based SIPRNET systems and classified computing environments.

Install, configure, maintain, troubleshoot, and upgrade Windows Server and workstation systems in accordance with approved technical and security baselines.

Administer Active Directory environments, including user and computer accounts, organizational units, security groups, permissions, and domain services.

Perform user account administration, access provisioning, password resets, group membership changes, and other identity and access management functions in accordance with approved procedures.

Perform operating system, application, and vendor software patching in accordance with approved configuration management and cybersecurity requirements.

Implement and maintain DISA STIGs, security configurations, and other applicable cybersecurity controls across Windows servers, workstations, and supporting systems.

Conduct vulnerability remediation and configuration management activities using approved enterprise security and vulnerability management tools such as ACAS.

Monitor system health, performance, availability, capacity, and security events using approved monitoring, logging, and security tools.

Perform system recovery, backup, restoration, and continuity activities in accordance with established procedures.

Support virtualization environments, including the administration and troubleshooting of virtual machines and associated Windows operating systems.

Support the installation, configuration, testing, and operational deployment of new SIPRNET servers, workstations, applications, systems, and security solutions.

Perform system configuration changes in accordance with established change management and configuration management processes.

Support Cyber Operational Readiness Assessments (CORA), DISA inspections, audits, security assessments, and other customer compliance activities.

Maintain accurate system documentation, configuration records, technical baselines, standard operating procedures, account documentation, and troubleshooting guides.

Maintain system inventories and ensure hardware and software configurations remain consistent with approved baselines.

Coordinate with cybersecurity, network, engineering, security, and other technical teams to resolve system-level issues and operational deficiencies.

Research emerging technologies and technical solutions and recommend improvements to the SIPRNET systems environment.

Provide technical guidance and remote assistance to users and administrators at geographically dispersed locations.

Required Experience

Demonstrated hands-on experience supporting SIPRNET or classified systems operations in a Department of Defense environment.

Experience supporting Cyber Operational Readiness Assessments (CORA).

Experience installing, configuring, maintaining, and troubleshooting Windows Server operating systems in enterprise environments.

Experience administering Active Directory, including users, groups, permissions, PKI certificates, and Group Policy Objects.

Experience supporting enterprise-scale classified infrastructure across multiple geographically dispersed locations.

Experience with PowerShell scripting and automation for Windows administration.

Experience with Windows security hardening, system configuration, vulnerability remediation, and patch management.

Experience supporting vulnerability scanning, remediation, configuration management, and security compliance activities.

Experience supporting virtualization technologies and virtual machine administration.

Experience with system monitoring, event logs, performance analysis, and troubleshooting tools.

Experience supporting backup, restoration, and system recovery activities.

Working knowledge of NIST SP 800-53, NIST SP 800-171, RMF, DISA STIGs, vulnerability management, configuration management, and System Security Plans.

Ability to create and maintain technical documentation, system diagrams, configuration records, standard operating procedures, and troubleshooting documentation.

Strong analytical and problem-solving skills with the ability to independently troubleshoot complex technical problems.

Ability to clearly communicate technical requirements, technical instructions, and troubleshooting steps to personnel with varying levels of technical experience, including providing effective remote guidance and support.

Strong written and verbal communication skills.

Success in this position will be measured by:

SIPRNET systems consistently maintain operational and compliance readiness throughout the year.

CORA assessments are completed successfully with minimal findings.

Standardized systems administration practices are implemented across all environments.