Senior Linux Administrator

Key Responsibilities

• Linux Platform Administration: Manage the complete lifecycle (provisioning, patching, upgrading, decommissioning) of all RHEL servers supporting the enterprise.
• Develop and maintain automation using Ansible, Bash, and/or Python to ensure consistent and rapid deployment of enterprise-wide changes.
• Deploy and maintain servers in clustered environments.
• Performance Tuning and Optimization: Proactively monitor and tune the performance of the RHEL environment to support high-throughput, low-latency data processing and ingestion.
• Perform kernel-level tuning (sysctl), I/O optimization, and network performance analysis.
• Troubleshoot and resolve complex performance bottlenecks related to CPU, memory, storage, and networking.
• Operational Support and Troubleshooting: Serve as an escalation point for both the Operations Center and other Unix team members.
• Triage and resolve infrastructure issues, providing root cause analysis.
• Work closely with application, storage, and network teams to resolve cross-domain service issues.
• Work with the Backup team to ensure consistent backups of all Linux servers.
• Security and Compliance: Implement and maintain system security in accordance with federal standards (NIST, FISMA, and DISA STIGs).
• Manage user access and system entitlements, including SSSD/LDAP/Active Directory integration.
• Troubleshoot and resolve SELinux problems.
• Participate in security audits and provide remediation for findings.
• Participate in an on-call rotation for 24/7/365 operational support.

Requirements

• Must be a U.S. Citizen.
• Must be able to pass a background investigation to obtain and maintain a Public Trust security clearance.
• Bachelor's degree in Computer Science, Information Technology, or a related field (or 7+ additional years of equivalent experience).
• 10+ years of dedicated experience as a Linux/RHEL Engineer or Administrator.
• Strong experience in Linux performance tuning, kernel parameter analysis (sysctl), and troubleshooting with tools like vmstat, iostat, sar, and perf.
• Expert-level scripting with Bash and strong proficiency with Ansible for configuration management and automation.
• In-depth knowledge of Linux storage (LVM, XFS, NFS, CLVM) and networking (TCP/IP, DNS, bonding).
• Expertise across RHEL 7, 8, and 9 environments.

Preferred Qualifications

• Active Public Trust clearance (Titles 13 & 26).
• Red Hat Certified Engineer (RHCE) or Red Hat Certified Architect (RHCA).
• Experience in a large-scale data center or high-performance computing (HPC) environment.
• Experience with Cisco UCS.
• Experience with and administration of IBM Storage Scale/GPFS.

Benefits

• 401(k) with matching and 100% Vested.
• Health Insurance - 3 plans to select from.
• Dental insurance.
• Vision Insurance.
• Health savings account.
• Life insurance.
• Short Term Disability.
• Long Term Disability.
• AD&D.
• Paid time off.
• Professional development assistance.
• Training.
• Tuition reimbursement.
• Flexible schedule.
• Flexible spending account.
• Referral program.
• Paid Legal Plan.

Benefits

• Referral program.
• Paid Legal Plan.

Equal Opportunity/Affirmative Action Employer

We evaluate qualified applicants without regard to race, color, religion, sex, national origin, disability, Veteran status, sexual orientation, or other protected characteristic.