Senior Systems Administrator - Hybrid (Windows/Linux, Cloud)

Integrated Systems Corp.; Mequon (WI); Hybrid; USD 110,000 - 140,000; Full time

Benefits offered by this job

401(k) plan

Profit sharing

Health & dental benefits

Job summary

Integrated Systems Corporation (ISCorp) in Mequon, WI is seeking a Senior Systems Administrator to support Windows and Linux infrastructure across customer environments. The role is senior and customer-facing, focusing on deployment, virtualization, automation, security, monitoring, and documentation.

You will work with VMware, KVM, Azure, AWS, and Google Cloud, develop scripts in PowerShell, Bash, or Python, and coordinate with network, storage, and DB teams.

Qualifications

• 5+ years of hands-on systems administration in hosted-services or MSP/ASP environments.
• Strong Windows Server and enterprise Linux administration.
• Active Directory, Group Policy, Windows services, Linux services, patching, lifecycle management.
• Networking knowledge: TCP/IP, DNS, DHCP, VPNs, firewalls.
• Experience with VMware and/or KVM virtualization.
• Scripting and automation using PowerShell and at least one Linux language (Bash, Python, or Ansible).
• Experience with IIS, Tomcat, or similar web/app servers.
• Ability to create clear technical documentation and follow structured procedures.
• Excellent communication and ability to explain technical issues to non-technical stakeholders.
• Ability to work independently, learn quickly, manage priorities, and maintain attention to detail.
• Bachelor’s degree in CS/IT or related field or equivalent experience.

Responsibilities

• Windows Systems Administration: install, configure, maintain, patch, troubleshoot, and optimize Windows Server and related Microsoft infrastructure.
• Linux Systems Administration: install, configure, maintain, patch, troubleshoot, and optimize Linux servers (RHEL and others).
• Application & ISV Support: deploy, configure, and support ISV applications and dependencies.
• Application Virtualization & Remote Access: support Citrix, RDS, Parallels RAS, including publishing and connectivity.
• Virtualization & Cloud: manage VMware & KVM; work with Azure, AWS, Google Cloud as needed.
• Automation & Scripting: develop repeatable automation using PowerShell, Bash, Python, Ansible.
• Monitoring & Performance: implement monitoring to identify availability, capacity, performance issues.
• Security & Compliance: apply security best practices, hardening, patching, access controls, remediation.
• Backup, Recovery & Storage: support backup/recovery and enterprise storage solutions.
• Networking & Connectivity: troubleshoot TCP/IP, DNS, DHCP, VPNs, firewalls in coordination with network teams.
• Database & Middleware Support: support SQL Server, OpenEdge, MySQL/MariaDB, Oracle, Tomcat, etc.
• Customer & ISV Engagement: serve as senior technical point of contact and translate issues for non-technical stakeholders.
• Cross-Team Collaboration: work with network, database, storage, security, service delivery, product, and project teams.
• Project & Product Delivery: participate in infrastructure planning, migrations, upgrades, rollout of ISV solutions.
• Documentation & Knowledge Transfer: create and maintain runbooks and knowledge-base articles.
• Operational Support: participate in production support and after-hours on-call rotations.

Skills

Windows Administration

Linux Administration

Customer-facing communication

Scripting & automation

Education

Bachelor’s degree in Computer Science/Information Technology or related

Tools

VMware

KVM

Azure

AWS

Google Cloud

PowerShell

Bash

Python

Ansible

IIS

Tomcat

Job description

Integrated Systems Corporation (ISCorp) in Mequon, WI is seeking a Senior Systems Administrator to support Windows and Linux infrastructure across customer environments. The role is senior and customer-facing, focusing on deployment, virtualization, automation, security, monitoring, and documentation.

You will work with VMware, KVM, Azure, AWS, and Google Cloud, develop scripts in PowerShell, Bash, or Python, and coordinate with network, storage, and DB teams.