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Senior Linux System Administrator - 306502

Delaware Nation Industries
Dahlgren, USA
Senior
Onsite
Discovered 1 weeks ago
ansibledockergitlinuxpuppetvmware

Full Job Posting

Responsibilities

  • Administer, engineer, optimize, and maintain enterprise Linux systems and services across multiple security levels and operational environments.
  • Install, configure, harden, patch, upgrade, and decommission Linux operating systems, applications, services, and supporting infrastructure.
  • Support Red Hat Enterprise Linux and other approved Linux distributions, including system services, package management, storage, networking, authentication, logging, and performance tuning.
  • Design and implement repeatable procedures for system builds, provisioning, configuration management, patching, backup, recovery, restoration, and lifecycle operations.
  • Analyze complex system, application, hardware, virtualization, storage, and network problems; conduct root-cause analysis and implement durable corrective actions.
  • Monitor system availability, resource utilization, capacity, performance, and security posture; identify risks and recommend improvements before they affect mission operations.
  • Administer and troubleshoot VMware or comparable virtualized infrastructure, including virtual machines, images, templates, virtual networking, and storage dependencies.
  • Develop and maintain scripts and automation using Bash, Python, Ansible, Puppet, or comparable tools to improve consistency, reduce manual effort, and support troubleshooting.
  • Support DevSecOps practices, source-code or configuration repositories, automated workflows, and controlled deployment processes when applicable to the environment.
  • Apply DISA STIGs, security baselines, vulnerability-remediation procedures, and other DoD cybersecurity requirements to Linux systems and applications.
  • Execute or support ACAS/Nessus scans, vulnerability analysis, remediation, validation, and compliance reporting.
  • Maintain secure system access, including accounts, roles, privileges, SSH, authentication services, certificates, keys, and least-privilege controls.
  • Support SAN/NAS storage, NFS, iSCSI, file systems, backup infrastructure, and data-transfer services as assigned.
  • Support authorized electronic and manual data transfers between network environments and troubleshoot transfer failures, integrity issues, and related operational problems.
  • Participate in system integration, testing, acceptance, change control, technical interchange meetings, exercises, and mission-readiness activities.
  • Produce and maintain system documentation, architecture diagrams, standard operating procedures, configuration records, plans of action and milestones, and technical reports.
  • Provide technical leadership, mentoring, knowledge transfer, and cross-training to Mid-level administrators and other team members.
  • Coordinate with cybersecurity, network, Windows, application, database, service desk, and Government teams to resolve escalated incidents and maintain continuity of operations.
  • Participate in scheduled maintenance, planned outages, incident response, and after-hours or on-call support as required by the contract.

Requirements

  • Active DoD TS/SCI security clearance.
  • At least six (6) years of professional Unix/Linux systems administration experience.
  • DoD 8570/8140-compliant IAT III certification, such as CISSP, CASP+ or another current DoD-approved equivalent.
  • Demonstrated experience administering enterprise Linux systems in a DoD, intelligence, classified, or similarly regulated environment.
  • Strong knowledge of Linux system architecture, networking, storage, system services, access control, logging, troubleshooting, and performance tuning.
  • Experience with system backup and recovery, software and patch management, security hardening, vulnerability remediation, and configuration control.
  • Experience with virtualization technologies, preferably VMware vSphere and related management components.
  • Proficiency with shell scripting and demonstrated ability to automate or streamline system administration tasks.
  • Experience diagnosing complex technical issues, performing root-cause analysis, and communicating solutions to technical and nontechnical stakeholders.
  • Strong written and verbal communication skills and the ability to work independently, lead technical efforts, and collaborate across functional teams.

Preferred Qualifications

  • Experience supporting Air Force, JWAC, JITS, Joint, intelligence, or other DoD mission environments.
  • Experience with Red Hat Enterprise Linux 7/8/9 or successor supported releases, CentOS, Scientific Linux, Debian, or comparable distributions.
  • Experience with Puppet Enterprise, Ansible, CloudBolt, Git, Docker, or comparable automation and DevSecOps technologies.
  • Experience supporting multi-level security, cross-domain solutions, classified networks, data-transfer systems, or mission-essential communications environments.
  • Experience with ACAS/Nessus, HBSS/endpoint security tools, STIG Viewer, vulnerability-management platforms, or comparable DoD cybersecurity tools.
  • Experience with SAN/NAS technologies, NFS, iSCSI, RAID, LVM, XFS, ext4, ZFS, or other enterprise file systems.
  • Experience with DNS, DHCP, NTP, LDAP/Active Directory integration, RADIUS, PKI, certificates, SSH, TCP/IP, and firewall-related troubleshooting.
  • Experience with monitoring, logging, configuration-management, ticketing, and IT service-management platforms.
  • Bachelor’s degree in information technology, computer science, cybersecurity, engineering, or a related field; equivalent experience may be considered.
  • Linux, VMware, automation, security, or other relevant industry certifications.

Benefits

  • Benefits Include:
  • Covers 100% of employee benefit premiums, including Medical (PPO or HDHP Option), Vision, Dental
  • Matching 401K
  • Short- and Long-Term Disability
  • Pet Insurance
  • Professional Development/Education Reimbursement
  • Parking and Transit Benefits for NY, NJ, ATL, and DC Metro areas
  • Other Duties:
  • Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice.
  • Salary Compensation: $120,000-$125,000
  • Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans

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