Linux Systems Administrator

Sentinel Technologies; Chicago (IL); Hybrid; USD 82,000 - 110,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

401(k) with match

Pension plan

Life insurance

Bonus opportunities

Paid time off

Paid holidays

Job summary

Sentinel Technologies is seeking a Linux Systems Engineer to install, administer, and support Red Hat, VMware ESXi, HPE infrastructure, and Azure cloud environments hosting Oracle and enterprise apps.

The role emphasizes system availability, automation, patching, security, and disaster recovery across data centers with a 24/7 on-call rotation in a hybrid Chicago-based setting.

Qualifications

• 2+ years of experience supporting enterprise Linux and virtualized infrastructure, including Red Hat Enterprise Linux, VMware, and hybrid on-premises/cloud environments.
• Hands-on experience with Red Hat Satellite for patching, upgrades, and lifecycle management.
• Strong automation and scripting skills with Ansible and CI/CD processes.
• Knowledge of HPE server infrastructure, SAN/storage, and backup solutions (Veeam, Avamar, or similar).
• Solid Linux, networking, and security knowledge (TCP/IP, DNS, NFS, HTTP/S) and hardening.
• Experience supporting mission-critical apps in a 24/7 environment; Oracle, Docker, or Kubernetes is a plus.
• Strong problem-solving, communication, and collaboration; document processes and manage change controls.
• Legally authorized to work in the US without sponsorship.
• Must demonstrate a can-do attitude.

Responsibilities

• Install, administer, and support Red Hat Enterprise Linux, VMware ESXi, HPE infrastructure, and Azure cloud environments.
• Ensure system availability, performance tuning, automation, patching, monitoring, security, disaster recovery, and upgrades across data centers and locations.
• Troubleshoot hardware and software issues; manage capacity and backups; support change-management processes.
• Document standards and participate in 24/7 on-call rotation.
• Collaborate with internal teams and vendors; drive continuous infrastructure improvements.

Job description

Responsibilities

Sentinel is seeking a Linux Systems Engineer for one of our strategic partners. This administrator is responsible for installing, administering, and supporting Red Hat Enterprise Linux, VMware ESXi, HPE infrastructure, and Azure cloud environments that host critical Oracle and enterprise applications.

The role ensures system availability, performance tuning, automation, patching, monitoring, security, disaster recovery, and infrastructure upgrades across data centers and manufacturing locations. The engineer will troubleshoot hardware and software issues, manage capacity and backups, support change‑management processes, document standards, and participate in a 24/7 on‑call rotation.

Success requires strong problem‑solving skills, proactive system management, collaboration with internal teams and vendors, and a “can‑do” attitude.

This is a Direct Hire hybrid role based in downtown Chicago, IL.

Qualifications

• 2+ years of experience supporting enterprise Linux and virtualized infrastructure, including Red Hat Enterprise Linux, VMware, and hybrid on‑premises/cloud environments.
• Hands‑on experience with Red Hat Satellite for patching, upgrades, system lifecycle management, and maintaining highly available production environments.
• Strong automation and scripting skills with experience in Ansible, CI/CD processes, and automating system administration tasks such as provisioning, patching, and monitoring.
• Knowledge of HPE server infrastructure, SAN/storage technologies, and backup/recovery solutions (Veeam, Avamar, or similar), with a focus on availability, performance, and disaster recovery.
• Solid understanding of Linux operating systems, networking, and security, including TCP/IP, DNS, NFS, HTTP/S, vulnerability remediation, and infrastructure hardening.
• Experience troubleshooting and supporting mission‑critical applications and infrastructure in a 24/7 production environment; experience with Oracle, Docker, or Kubernetes is a plus.
• Strong problem‑solving, communication, and collaboration skills, with the ability to document processes, manage change controls, and drive continuous infrastructure improvements.
• Legally authorized to work in the US without sponsorship.
• Must demonstrate a “can‑do” attitude.

Compensation Range

$82,000–$110,000 annually.

Benefits

Our partner offers a comprehensive benefits package starting on day one, including medical, dental, and vision coverage, with the company covering approximately 75% of premium costs. Employees are eligible for a 401(k) with company match, a pension plan, and optional benefits such as life, accident, legal, and pet insurance. The company also provides annual or quarterly bonus opportunities tied to safety, quality, and productivity performance, as well as paid time off and paid holidays.

Equal Employment Opportunity

Sentinel is proud to be an equal‑opportunity employer, including disability and veterans. In accordance with Title VII and state regulations, all qualified applicants will receive consideration for employment without regard to race, color, religion, age, sex, sexual orientation, gender identity, national origin, marital status, pregnancy, genetics, disability, military, veteran status, or any other basis protected by law.