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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior System Administrator - **Company:** Penhall Company and Penhall Technologies - **Location:** Villa Park, CA, United States - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Microsoft Word, Microsoft Windows, Active Directory, Microsoft Azure, Backup Devices, Cloud Computing, Program Optimization, Cyber Security, Data Integrity, Dynamic Host Configuration Protocol, Disaster Recovery, Domain Name System (DNS), Multi-Factor Authentication, Networking Hardware, Intrusion Detection and Prevention, Virtual Private Networks (VPN), Microsoft Visio, Network Diagrams, Packet Analyzer, Microsoft PowerPoint, Windows PowerShell, Azure Active Directory, Microsoft SharePoint, Virtual Local Area Networks, Virtualization Technology, Wireless Access Point, System Availability, Firewalls (Computer Science), Information Technology, Performance Monitor, Patch Management, Cloud Migration, Veeam, Network Server, Vmware - **Published:** August 4, 2026 - **Apply:** https://www.disabledperson.com/jobs/73985866-senior-system-administrator ## About the Role * 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., * 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. ## 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., * 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. ## Related Videos - [WebAssembly: The Next Frontier of Cloud Computing](https://www.wearedevelopers.com/videos/972-webassembly-the-next-frontier-of-cloud-computing) - [Kubernetes Security - Challenge and Opportunity](https://www.wearedevelopers.com/videos/412-kubernetes-security-challenge-and-opportunity) - [What makes Cybersecurity different for critical infrastructure?](https://www.wearedevelopers.com/videos/571-what-makes-cybersecurity-different-for-critical-infrastructure) - [Generating code with Angular schematics](https://www.wearedevelopers.com/videos/129-generating-code-with-angular-schematics) - [Hacking MSSQL on Cloud. 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