System Administrator II (Linux)

Overview

Nakupuna Companies is seeking a System Administrator II (Linux). The System Administrator II (Linux) is responsible for installing, configuring, maintaining, and troubleshooting Linux-based systems and supporting infrastructure to ensure availability, performance, and security. This position provides intermediate-level system administration support across standalone, virtualized, and cloud environments, including systems operating on NIPRNet, SIPRNet, DREN, JWICS, and other applicable DoD networks. The System Administrator II independently performs routine administration and troubleshooting activities, implements approved system changes, supports cybersecurity compliance requirements, and coordinates with technical teams to resolve complex infrastructure issues.

Responsibilities

The following duties reflect management's definition of essential functions for this job but do not restrict the tasks that might be assigned. Management may assign additional duties and responsibilities at any time due to reasonable accommodation or other reasons.

System Management

• Install and configure Linux environments and systems including back-end processes and scripts. Ensure configurations are in line with C5ISR policies and procedures for systems across various networks (DREN, NIPRnet, SIPRnet, JWICS, laboratory networks), and that permissions, policies, performance, and reviews are consistent with standards.
• Monitor system performance and availability.
• Implement system security measures; review logs and identify issues.
• Provide administration, refactoring support, architecture, planning, and execution of required cloud computing aspects, such as building and maintaining registered applications in an Amazon Web Services or Microsoft Azure environment.
• Maintain system documentation.
• Conduct system upgrades and patches.
• Perform routine and advanced troubleshooting of Linux operating systems, system services, authentication, storage, networking, and application dependencies.
• Manage user accounts, permissions, access controls, and system configurations in accordance with established security policies.
• Develop and maintain Bash, Python, or other approved scripts to automate routine administrative tasks and improve operational efficiency.
• Monitor system capacity, performance trends, and resource utilization; recommend corrective actions to maintain system reliability.

Infrastructure Support

• Configure, maintain, and troubleshoot storage resources, file systems, logical volumes, and associated storage services supporting Linux-based systems.
• Support application development and production environments by provisioning and configuring Linux servers, maintaining required services, troubleshooting system-level issues, and decommissioning legacy infrastructure in accordance with established procedures.
• Coordinate with the local Network Enterprise Center (NEC) and other infrastructure support organizations to submit and track service requests, resolve system and connectivity issues, and support infrastructure changes, resource allocation, and applicable cybersecurity documentation.
• Administer and support Linux systems hosting containerized applications, including Docker and Kubernetes environments, as applicable. Assist with troubleshooting container runtime, resource allocation, and operating system integration issues.
• Administer and maintain virtual machines within VMware vSphere/ESXi environments, including provisioning, template management, resource allocation, performance monitoring, and troubleshooting.
• Coordinate with the DREN Network Operations Center (NOC) and other network support organizations to troubleshoot connectivity issues and implement approved network configuration changes.

Technical Support

• Review and respond to vulnerability findings identified through ACAS scans, cybersecurity inspections, and other approved security assessment tools.
• Implement approved operating system patches, security updates, and configuration changes to remediate identified vulnerabilities and maintain compliance with applicable DoD cybersecurity requirements.
• Support endpoint security requirements, including applicable McAfee/Trellix security agents and associated system configurations.
• Apply and maintain applicable DISA Security Technical Implementation Guides (STIGs), document compliance status, and coordinate remediation of identified findings.
• Support cybersecurity personnel in resolving Plans of Action and Milestones (POA&Ms), vulnerability exceptions, and other security compliance requirements.
• Troubleshoot escalated system incidents and service requests, document resolutions, and coordinate with other technical teams as necessary.

Qualifications

Education and Experience

• Bachelor’s degree in computer science, IT, CS, cybersecurity, or related field
• CompTIA Security+ CE or another certification satisfying applicable DoD 8140 qualification requirements for the assigned position.
• 5+ years of system administration experience, including 3+ years supporting Linux systems.
• Preferred certifications:
• Red Hat Certified System Administrator (RHCSA)
• Red Hat Certified Engineer (RHCE)
• VMware Certified Professional (VCP)
• AWS Certified SysOps Administrator – Associate or relevant Azure administrator certification
• CompTIA Server+

Clearance Requirements: Secret, Must be a U.S. Citizen.

Location: Fort Belvoir, VA

Physical Requirements: The ideal candidate must at a minimum, be able to meet the following physical requirements of the job with or without a reasonable accommodation:

• Ability to perform repetitive motions with the hands, wrists, and fingers.
• Ability to engage in and follow audible communications in emergencies.
• Ability to sit for prolonged periods at a desk and work on a computer.

The Nakupuna Companies use a market-based compensation strategy to ensure that our employees are compensated within applicable market ranges commensurate with multiple factors, including but not limited to the individual’s particular combination of education, knowledge, skills, competencies, and experience, as well as contract-specific affordability, organizational requirements, and position location. The projected compensation range for this position is $75,000.00 to $132,000.00 (annualized USD). The salary range displayed represents the typical salary range for this position and is just one component of Nakupuna Companies total compensation package for employees.