Linux Systems Administrator

Responsibilities

Sentinel is seeking a Linux Systems Engineer for one of our strategic partners. This administrator is responsible to install, administer, and support Red Hat Enterprise Linux, VMware ESXi, HPE infrastructure, and Azure cloud environments that host critical Oracle and enterprise applications. This role is responsible for 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, and collaboration with internal teams and vendors.

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

• 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, with Oracle, Docker, or Kubernetes experience considered 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

We focus on candidates that display our ACE factor – Attitude, Compassion, and Enthusiasm to deliver quality solutions with exceptional customer service.

$82,000-$110,000 per year

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 both a 401(k) with company match and a pension plan, along with 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.

MOTIVATED… make IT happen!

Sentinel Technologies, Inc. has a long-standing reputation as a top workplace, and we welcome motivated individuals to join our team.

About Sentinel:
Sentinel delivers IT solutions that address security, communications, systems & networks, software applications, cloud, and managed services. Since 1982, Sentinel has grown to be a leading IT services provider in the US, with primary support centers in Downers Grove (HQ), Chicago, Springfield, IL;
Phoenix, AZ;
Lansing, MI;
Grand Rapids, MI;
Milwaukee, WI; and Denver, CO.

If you share our passion for technology and want to be part of a top workplace environment, we’d like to have you join our team. Learn more at

As part of Sentinel's employment process, candidates will be required to complete a background check. Only those who meet the minimum requirements will be contacted. No phone calls please.

Sentinel is an equal opportunity employer, including disability and veterans. Qualified applicants will be considered without regard to race, color, religion, age, sex, sexual orientation, gender identity, national origin, marital status, pregnancy, genetics, disability, military or veteran status, or any other basis protected by law. If you are an individual with a disability and need assistance in applying for a position, please contact

The Know Your Rights poster is available here. Sentinel EEO Policy Statement is available here.

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