Top 33 Senior security systems administrator Jobs in Mequon, Wi

Senior Security Systems Administrator
Integrated Systems Corp. —Mequon, WI
- $110,000 - $140,000 a year
- Full-time
- Azure
- Computer Science
- 5 years
- Profit sharing
- Health insurance
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Cybersecurity Engineer
Phoenix Investors —Milwaukee, WI
- Full-time
- Computer science
- Computer Science
- 3 years
- Free parking
- Paid holidays
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Senior IT Administrator
MLG Capital —Brookfield, WI
- Full-time
- System design
- Office
- Microsoft Office
- Paid parental leave
- Paid holidays
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LIBRARY PUBLIC SERVICES AREA MANAGER
City of Milwaukee —Milwaukee, WI
- $104,997 - $128,031 a year
- Overtime
- Background check
- Public speaking
- Research
- Wellness program
- Paid parental leave
Salesforce CRM Administrator
Herzing University —Milwaukee, WI
- $117,300 - $158,700 a year
- Computer Science
- Mid-level
- Office
- Health insurance
- Paid time off
9d
Senior Specialist - SAP Basis Administration
Eaton —Menomonee Falls, WI
- $130,000 - $190,000 a year
- Hybrid work
- Background check
- Azure
- Writing skills
- Retirement plan
Technical Support Specialist
Revolution Search Group —Milwaukee, WI
- Full-time
- Mid-level
- Analysis skills
- Computer networking
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Systems Engineer I
Impact Networking —Brookfield, WI
- $75,000 - $90,000 a year
- Full-time
- Computer science
- Azure
- Computer Science
- Paid parental leave
- Paid holidays
Senior Audit Manager - Information Security
U.S. Bank National Association —Milwaukee, WI
- $143,905 - $169,300 a year
- Full-time
- Azure
- 11+ years
- Office
- Paid holidays
- Disability insurance
8d
Sr. Systems Engineer – SQL Database Administrator.
U.S. Bank National Association —Brookfield, WI
- $105,400 - $124,000 a year
- Full-time
- Azure
- 5 years
- System design
- Paid holidays
- Disability insurance
3d
IT Support Technician
MPE-Inc —Milwaukee, WI
- $23 - $28 an hour
- Full-time
- Mid-level
- Office
- High school diploma or GED
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9d
Senior Investment Accounting Systems Administrator
Allspring Global Investments Holdings, LLC —Milwaukee, WI
- $150,000 a year
- Full-time
- Hybrid work
- 11+ years
- Office
- Finance
IT Desktop Support Technician
Komatsu Mining Corp. —Milwaukee, WI
- $49,100 - $61,400 a year
- High school diploma or GED
- Travel
- Associate's degree
- Health savings account
- Disability insurance
Quick Apply
Lead Tech Support Specialist
Fathom Mfg —Hartland, WI
- $80,000 - $100,000 a year
- Full-time
- Computer science
- Oracle
- Computer Science
Quick Apply
Sr. Desktop Support Technician
Komatsu Mining Corp. —Milwaukee, WI
- $53,900 - $67,400 a year
- 5 years
- Office
- High school diploma or GED
- Health savings account
- Disability insurance
Quick Apply
Senior Systems Engineer Analyst
MGIC —Milwaukee, WI
- $105,590 - $179,510 a year
- Online Application
- 5 years
- System design
- Continuous improvement
- Profit sharing
- Wellness program
IT Infrastructure Administrator
PPC Partners —New Berlin, WI
- Computer science
- Azure
- Computer Science
Quick Apply
Senior IT Specialist - M365 & Active Directory Architect
Eaton —Menomonee Falls, WI
- Hybrid work
- Background check
- English
- Research
- Retirement plan
Senior AI Engineer - SFL Scientific
Deloitte —Milwaukee, WI
- $128,000 - $252,500 a year
- Full-time
- Computer science
- Azure
- Computer Science
NETWORK ARCHITECT
Milwaukee County Transit System —Milwaukee, WI
- $82,500 - $97,000 a year
- Full-time
- 5 years
- Windows
- Supervising experience

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senior security systems administrator jobs near mequon, wi

Senior Security Systems Administrator

Integrated Systems Corp. -
Mequon, WI

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Job Details

Full-time
$110,000 - $140,000 a year

Benefits

Profit sharing
Health insurance
Dental insurance
401(k)

Qualifications

Endpoint Security
IT user and group management
GPO
Tooling
Technical documentation
IT infrastructure
Incident management operations support
Security threat response protocols
Server virtualization
Vulnerability management
Windows support
Access control management
Incident response implementation
Automation tools
Production troubleshooting
Identity & access management

Full Job Description

ISCorp Job Description

Job Title:
Senior Security Systems Administrator

Department / Reports To:
Cyber Security | Reports to: Patrick Barwick

Job Summary

The Senior Security Systems Administrator leads the administration, optimization, and continuous improvement of ISCorp’s security infrastructure and operational defense platforms across hosted customer environments and internal systems. This role serves as an advanced technical resource for the deployment, configuration, monitoring, hardening, and support of critical security technologies, including SIEM, EDR/XDR, identity controls, email security, vulnerability management, and incident response tooling.

The Senior Security Systems Administrator operates with a high degree of independence and technical judgment, handling complex security events, driving remediation efforts, improving detection and response capabilities, and strengthening the security posture of production environments. This role partners closely with Infrastructure, Network, Engineering, Operations, and Compliance teams, and provides mentorship to less experienced administrators.

Key Responsibilities

Lead administration and optimization of security platforms, including SIEM, EDR/XDR, vulnerability management, log management, email security, and identity protection systems.
Investigate and respond to complex security alerts, incidents, and system anomalies, including containment, root cause analysis, recovery coordination, and post-incident improvements.
Design and refine alerting logic, dashboards, detection rules, and correlation use cases within SIEM and monitoring platforms.
Lead security hardening efforts across Windows systems, Active Directory, application platforms, and supporting infrastructure.
Oversee security patching strategy and coordination for servers, endpoints, and infrastructure platforms, especially for critical or high-risk vulnerabilities.
Serve as an escalation point for advanced endpoint protection, malware, ransomware, identity, and suspicious activity investigations.
Lead vulnerability management activities, including prioritization, remediation planning, validation, and trend analysis.
Administer and optimize Microsoft O365 security controls, including Defender, Conditional Access, MFA, Exchange security, and identity governance-related controls.
Partner with Compliance and leadership teams on audits, risk assessments, evidence collection, control maturity, and remediation planning.
Develop and maintain security standards, technical procedures, architecture documentation, and incident response playbooks.
Provide technical leadership on security initiatives, tool improvements, and cross-functional infrastructure projects.
Mentor Associate and intermediate-level administrators by providing guidance, review, and knowledge transfer.
Participate in and help coordinate high-severity on-call response and escalation activities.
Identify automation opportunities that improve visibility, consistency, response time, and operational resilience.

Required Qualifications

Bachelor’s degree in Computer Science, Information Systems, Cybersecurity, or a related field; or equivalent work experience.
Minimum of 5–7 years of progressive experience in systems administration, security operations, or infrastructure security roles.
Strong hands-on experience with enterprise security tools, including SIEM, EDR/XDR, vulnerability management, and identity/access controls.
Advanced proficiency with Windows Server, Active Directory, Group Policy, and system hardening practices.
Strong understanding of virtualization, hosting, and production infrastructure technologies, including VMware, Hyper-V, and OpenShift.
Working knowledge of scripting and automation tools such as PowerShell, Bash, or Ansible.
Demonstrated ability to handle complex troubleshooting, incident response, documentation, and cross-functional coordination.

Preferred Qualifications

Experience with Linux administration and hybrid Windows/Linux environments.
Experience with cloud security in Azure, AWS, or Google Cloud environments.
Relevant certifications such as Security+, CySA+, CISSP, SC-200, AZ-500, or equivalent.
Familiarity with firewall administration, backup/security resilience controls, and enterprise security architecture concepts.
Exposure to ITIL, change management, or formal project leadership practices.

Key Skills & Attributes

Advanced analytical and problem-solving skills.
Strong independent judgment and ownership of complex work.
Ability to lead technical initiatives and influence peers across teams.
Strong written and verbal communication, including the ability to explain risk and technical issues clearly.
Commitment to operational excellence, continuous improvement, and mentoring others.

Work Environment & Benefits

ISCorp offers a competitive salary and a full benefits package, including health, dental, 401(k), and profit sharing. Our Mequon headquarters provides a collaborative office environment with minimal travel requirements and an in-house fitness facility available to employees.

About ISCorp

With headquarters in Mequon, Wisconsin, ISCorp serves customers around the world. We deliver secure, private cloud solutions that support critical applications and data processing for a wide range of industries. Our focus is on exceeding customer expectations through technical excellence, innovation, and outstanding service.

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Refine Your Search

senior security systems administrator jobs in mequon, wi

Senior Security Systems Administrator

Cybersecurity Engineer

Senior IT Administrator

LIBRARY PUBLIC SERVICES AREA MANAGER

Salesforce CRM Administrator

Senior Specialist - SAP Basis Administration

Technical Support Specialist

Systems Engineer I

Senior Audit Manager - Information Security

Sr. Systems Engineer – SQL Database Administrator.

IT Support Technician

Senior Investment Accounting Systems Administrator

IT Desktop Support Technician

Lead Tech Support Specialist

Sr. Desktop Support Technician

Senior Systems Engineer Analyst

IT Infrastructure Administrator

Senior IT Specialist - M365 & Active Directory Architect

Senior AI Engineer - SFL Scientific

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