Top 18 Senior system administrator Jobs in Ontario, Ca

Senior System Administrator
Penhall Company —Anaheim, CA
- Full-time
- 5 years
- Office
- Bachelor's degree
Senior IT Support Specialist-Warehouse Operations
Zonberation Group —Rancho Cucamonga, CA
- $35 - $41 an hour
- 8 hour shift
- Spanish
- English
- Windows
- Health insurance
- 401(k)
Quick Apply
Senior Systems Administrator
Quantum Electronic Payments —Anaheim, CA
- $85,000 - $105,000 a year
- Full-time
- 5 years
- Office
- Microsoft Office
- Profit sharing
- Health insurance
Quick Apply
Senior Network Administrator
SchoolsFirst FCU —Tustin, CA
- $42.41 - $63.62 an hour
- Full-time
- Hybrid work
- Office
- 3 years
- High school diploma or GED
4d
Senior IT Systems Engineer
Credit Union of Southern California —Anaheim, CA
- $126,667 - $188,240 a year
- Weekends as needed
- Hybrid work
- System design
- Research
- Office
- Health insurance
Network Administrator Sr.
Provident Savings Bank, FSB —Riverside, CA
- Weekends as needed
- Azure
- Customer service
- Bachelor of Science
7d
Senior System Administrator (Temp)
Panda Restaurant Group —Rosemead, CA
- $43.26 - $66.82 an hour
- Temporary
- Hybrid work
- Hospitality
- ERP systems
- Office
- AD&D insurance
- Disability insurance
Quick Apply
Senior Admin & IT Coordinator - Immigration
CAIR LA —Anaheim, CA
- $34 - $38 an hour
- Weekends as needed
- Hybrid work
- Mid-level
- Administrative experience
- Bachelor's degree
- Health insurance
- Dental insurance
Quick Apply
Sr Systems Engineer, AI-Enabled Service Delivery (MSP - Hybrid)
ModernIT —La Verne, CA
- $110,000 - $130,000 a year
- Full-time
- Hybrid work
- 6 years
- Office
- Mentoring
- Commuter assistance
- Health savings account
Quick Apply
4d
Senior Physical Security Systems Engineer
In-N-Out —San Dimas, CA
- $130,000 - $160,000 a year
- Full-time
- Computer Science
- 5 years
- Engineering
- Profit sharing
- Health insurance
System Engineer III, Sr. Windows/Linux/VMWare/Data Center
FOOTHILL COMPUTERS —Fontana, CA
- On call
- Customer service
- System design
- Senior level
Sr Principal Network Administrator - Secret
Northrop Grumman —Azusa, CA
- $129,300 - $193,900 a year
- Overtime
- 6 years
- System design
- Windows
- Paid holidays
- Disability insurance
Senior Systems Engineer
Prescient Edge Federal —Riverside, CA
- Full-time
- Microsoft Excel
- Microsoft Outlook
- Computer Science
- Health insurance
- Dental insurance
Sr Engineer, Business Systems
Accurate Background —Irvine, CA
- $88,000 - $110,000 a year
- Full-time
- Background check
- 5 years
- System design
- Health insurance
- Dental insurance
Quick Apply
Senior Linux Systems Engineer, Connected Warfare
Anduril Industries —Anaheim, CA
- $170,000 - $210,000 a year
- Email
- 7 years
- System design
- Office
Quick Apply

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Senior System Administrator

Penhall Company -
Anaheim, CA

Apply Now

Job Details

Full-time

Qualifications

Endpoint Security
Presentation software
IT user and group management
GPO
Tooling
Implementing cloud migration projects
Cloud security management
Data recovery
Server backup and recovery
Communication platforms
Internal employee customer service
Cloud service support
Azure AD
Cloud networking
Server virtualization
Collaborative technology platforms
SharePoint
Data backup
Microsoft 365 support
Identity and access management (IAM) solutions
Cross-functional collaboration
Automation tools
PowerShell
Shell Scripting
Packet capture analyzers

Full Job Description

Position Description

The Senior Systems Administrator will serve as a critical member of Penhall's IT team, responsible for maintaining and enhancing the company’s IT infrastructure, both on-premises and in the cloud. This role will focus on ensuring high system availability, top-tier support, and adherence to IT best practices while delivering efficient and scalable solutions. The position requires expertise in system administration, cybersecurity, and process automation, with the ability to manage multiple priorities in a fast-paced environment.

Duties and Responsibilities:

Manage and administer on-premises and cloud-based IT infrastructure, including networking, servers, Active Directory, Azure, Microsoft 365, Track IT, and cybersecurity programs.
Serve as the highest escalation point for IT-related challenges, engaging with vendors and troubleshooting complex issues.
Design, implement, and optimize systems maintenance plans, including system performance monitoring, patching, and disaster recovery testing, with a focus on automation and improvement opportunities.
Champion cybersecurity best practices, including multi-factor authentication (MFA), least-privilege access, conditional access, and secure system configurations.
Lead efforts to replace or upgrade existing systems and align IT infrastructure with business goals.
Maintain and document IT processes, policies, and systems configurations (e.g., network diagrams, patch management, disaster recovery, security measures).
Configure and manage firewalls, switches, wireless access points, VPNs, and other networking devices.
Monitor, analyze, and act on system and security alerts, including those from Proofpoint and CrowdStrike platforms.
Deploy and manage backup and recovery solutions, ensuring data integrity and business continuity.
Create, maintain, and optimize PowerShell scripts and other automation tools to streamline repetitive IT tasks.
Conduct regular network audits and implement corrective measures as needed.
Manage and implement endpoint configuration tools, such as Automox, to ensure systems are secure and compliant.
Provide exceptional customer support to internal stakeholders and assist in resolving IT-related issues in a timely manner.
Author and maintain technical documentation using tools such as Microsoft Visio, Word, and PowerPoint.
Stay informed of emerging IT trends and technologies and recommend relevant solutions for Penhall’s needs.
Provide training, guidance, and mentorship to junior team members and support staff.
Perform other related duties as assigned by the manager.

Position Requirements

Required Skills and Abilities:

Proficiency in Microsoft 365 ecosystem, including Exchange Online, Teams, SharePoint, and OneDrive.
In-depth knowledge of Azure AD, including SSO, conditional access, synchronization methods, and group policy management.
Expertise in cybersecurity measures, including endpoint protection, encryption, intrusion detection, and secure configurations.
Strong experience with cloud platforms, particularly Azure, and performing premise-to-cloud migrations.
Advanced skills in PowerShell scripting and other automation tools.
Proficiency in managing virtualization platforms such as VMware or Azure.
Networking expertise, including DHCP, DNS, VLANs, and troubleshooting using packet capture tools.
Familiarity with enterprise backup solutions like Veeam and storage systems, including SAN and iSCSI technologies.
Strong written and verbal communication skills, with the ability to convey technical information to non-technical stakeholders.

Essential Core Competencies:

Problem Solving: Ability to efficiently diagnose and resolve technical issues.
Critical Thinking: Anticipates potential IT challenges and develops proactive solutions.
Attention to Detail: Ensures accuracy in configurations, updates, and documentation.
Communication Skills: Clearly explains technical concepts to stakeholders and creates comprehensive documentation.
Team Collaboration: Works effectively with IT, development, and operations teams to achieve infrastructure goals.
Customer Service Orientation: Delivers timely and effective support to end-users and stakeholders.
Adaptability: Responds to evolving technologies and organizational priorities with flexibility.

Education and Experience:

Bachelor’s degree in Computer Information Systems or a related field, or equivalent experience and certifications.
Minimum of 5+ years of systems administration experience in an enterprise environment.
Certifications such as Microsoft 365 or MCSE are preferred.

Physical Requirements:

Prolonged periods of sitting at a desk and working on a computer.
Must be able to lift up to 15 pounds at times.
Ability to walk job sites when necessary.
May be required to travel to job sites and other locations.

Application Instructions
Equal Opportunity Information

Legal Disclaimer:

Reasonable accommodations may be made to enable individuals with disabilities to perform the essential

functions of the job.

Penhall Company is an Equal Opportunity Employer and does not discriminate against any employee or applicant for employment because of race, color, sex, age, national origin, religion, sexual orientation, compensation inquiries, discussions or disclosures, gender identity and/or expression, status as a veteran, and basis of disability or any other federal, state or local protected class. (41 CFR §§ 60-1.4(a), 60-300.5(a) and 60-741.5(a))

This job description is intended to describe the general nature and level of work being performed by employees in this position. It is not intended to be an exhaustive list of all duties, responsibilities, or qualifications required. Penhall Company reserves the right to modify, add, or remove duties and to assign other responsibilities as necessary.

AI-Assisted Hiring and Automated Decision Tool Disclosure

The Company may use Artificial Intelligence (“AI”), machine learning technologies, and/or automated decision-making tools to assist in certain aspects of the recruitment and hiring process, including reviewing applications, resumes, assessments, and candidate qualifications. These tools are used to support the evaluation process and are not used as the sole basis for employment decisions.

All employment decisions are ultimately made by qualified Company representatives. The Company maintains human oversight of hiring decisions and does not permit automated systems to make final employment determinations independently.

The Company is committed to equal employment opportunity and to complying with all applicable federal, state, and local employment, privacy, and anti-discrimination laws. The Company does not intentionally use AI systems in a manner that unlawfully discriminates against applicants or employees based on any protected characteristic under applicable law.

Applicants may request reasonable accommodations, alternative evaluation methods, or additional information regarding the Company’s use of automated tools by contacting Human Resources.

Where required by applicable law, the Company may provide additional notices regarding the use of automated decision-making tools, data practices, retention periods, or bias audit information.

Apply Now

Refine Your Search

senior system administrator jobs in ontario, ca

Senior System Administrator

Senior IT Support Specialist-Warehouse Operations

Senior Systems Administrator

Senior Network Administrator

Senior IT Systems Engineer

Network Administrator Sr.

Senior System Administrator (Temp)

Senior Admin & IT Coordinator - Immigration

Sr Systems Engineer, AI-Enabled Service Delivery (MSP - Hybrid)

Senior Physical Security Systems Engineer

System Engineer III, Sr. Windows/Linux/VMWare/Data Center

Sr Principal Network Administrator - Secret

Senior Systems Engineer

Sr Engineer, Business Systems

Senior Linux Systems Engineer, Connected Warfare

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