Senior Systems Administrator

Cayuse Holdings

. Administer, optimize, and troubleshoot Windows and UNIX systems, including Linux or Solaris .

Posted 9/22/2026full-timeSt. Clair County • Illinois • United StatesSenior💰 $85,000 - $95,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in administering and optimizing Windows and UNIX systems, including Linux and Solaris, while effectively managing system solutions and troubleshooting complex technical issues. Proficient in capacity planning, system analysis, and vendor collaboration to ensure high performance and minimal downtime.

Highest-signal resume keywords

Windows System AdministrationUNIX System AdministrationDoD 8140-Compliant CertificationsTop-Secret ClearanceCapacity Planning

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

System OptimizationTroubleshootingDiagnostic TestingSoftware InstallationPreventive MaintenanceResource Utilization AnalysisConfiguration ManagementTechnical Problem ResolutionSystem Fault AnalysisCustom System Solutions

Soft Skills

Interpersonal CommunicationOrganizational SkillsAnalytical SkillsProblem-Solving SkillsMultitasking Ability

Tools & Technologies

MS OfficeWordOutlookPowerPointExcel

Certifications & Qualifications

IAT Level II Credentials

Industry Keywords

Capacity PlanningSystem ConfigurationMainframe SystemsClient/Server SystemsTechnical DocumentationSensitive Information HandlingBackground Check ComplianceHardware Equipment Management

Tech Stack

Tools & technologies

LinuxUnix

About the role

Key responsibilities & impact

Administer, optimize, and troubleshoot Windows and UNIX systems, including Linux or Solaris
Oversee setup, configuration, and operation of mainframe, mini, and client/server-based business systems
Serve as a subject matter expert for operating systems
Plan, implement, and manage custom system solutions
Monitor, analyze, and optimize system operations and resource utilization
Conduct capacity planning for scalability and performance
Analyze system faults, identify root causes, and resolve technical issues
Perform diagnostic tests and detailed hardware and operating-system problem analysis
Collaborate with vendors to troubleshoot and resolve complex technical problems
Evaluate, install, and manage software through testing and production
Prepare documentation for system testing, software installation, and configuration
Design and execute preventive maintenance plans
Address system and environment issues to minimize downtime
Determine system and environment requirements with business units for multiple projects
Coordinate vendor updates and technical issue resolution
Report to the Program Manager

Requirements

What you’ll need

Bachelor’s Degree with 6–8 years of related experience or Master’s Degree with 2–6 years of experience
Considerable experience configuring and administering Windows and UNIX systems (Linux or Solaris)
DoD 8140-compliant certifications (e.g., IAT Level II credentials)
Top-Secret Clearance is required
Must be able to pass a background check; additional checks may be required
Exceptional interpersonal, verbal, and written communication skills
Excellent organizational, analytical, and problem-solving skills
Ability to multitask, prioritize, adapt to changing priorities, and learn quickly
Ability to work independently and on a multifunctional team
Ability to appropriately handle sensitive and confidential information
Proficiency in MS Office, Word, Outlook, PowerPoint, and Excel
Ability to work onsite in the main office
Ability to lift and move hardware equipment weighing up to 50 pounds
Ability to work outside normal business hours and travel as needed

Benefits

Comp & perks

Medical, Dental and Vision Insurance
Wellness Program
Flexible Spending Accounts (Healthcare, Dependent Care, Commuter)
Short-Term and Long-Term Disability options
Basic Life and AD&D Insurance (Company Provided)
Voluntary Life and AD&D options
401(k) Retirement Savings Plan with matching after one year
Paid Time Off
Flexible schedule may include holidays
Business or professional development travel opportunities