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Senior Systems Administrator

Tucson, AZ

Company Overview

Job Description

The Senior Systems Administrator serves as a senior technical leader within the IT Infrastructure team. This role is responsible for the design, administration, security, and reliability of core enterprise systems, including on-premises and cloud infrastructure, identity and access management platforms, endpoint management solutions, and backup and recovery services.

This is a hands-on technical role, not a people-management position. The Senior Systems Administrator works closely with Infrastructure, Security, Network, and Application teams to ensure systems remain secure, scalable, resilient, and aligned with business objectives.

The role operates within a regulated environment and supports compliance initiatives through effective system administration, security controls, documentation, and operational excellence. This role is based on-site in Tucson, Arizona and requires regular engagement with IT, Security, Infrastructure, Network, Application, and business teams. Travel may be required to support other company locations, vendors, audits, or operational readiness activities.

Key Responsibilities

• Administer and maintain core infrastructure platforms, including Windows Server, virtualization environments, storage systems, and backup solutions.
• Manage and secure Microsoft 365 and Microsoft Entra ID, including identity lifecycle management, Conditional Access, MFA, and privileged access controls.
• Deploy, manage, and harden endpoint environments using Microsoft Intune, Group Policy, and endpoint security solutions.
• Design, implement, and maintain backup, disaster recovery, and business continuity capabilities; regularly test and validate recovery procedures.
• Perform system patching, vulnerability remediation, and security hardening across server and endpoint environments.
• Support system-level incident response, containment, recovery, and post-incident remediation activities.
• Develop and maintain system documentation, runbooks, diagrams, configuration standards, and asset inventories.
• Lead infrastructure modernization initiatives, including cloud adoption, platform upgrades, and technology lifecycle management.
• Provide technical guidance and mentorship to junior administrators and support personnel.
• Collaborate with vendors and managed service providers to support operational and project-related objectives.

Required Qualifications

• Minimum of 5 years of experience in systems administration, infrastructure engineering, or a related technical discipline.
• Strong hands-on experience with Windows Server administration, Microsoft 365 and Microsoft Entra ID, Active Directory and Group Policy, identity and access management, and backup and disaster recovery solutions.
• Experience implementing least-privilege access models, privileged account management, and secure system configurations.
• Proven ability to troubleshoot and resolve complex infrastructure issues across multiple technologies.
• Strong documentation, organizational, and operational discipline.
• Excellent communication and collaboration skills.
• U.S. Citizenship required.

Preferred Qualifications

• Experience supporting regulated, government, aerospace, defense, or security-focused environments.
• Familiarity with infrastructure controls supporting NIST 800-171, CMMC, DFARS, SOX, or similar compliance frameworks.
• Experience with Conditional Access, Privileged Identity Management, Just-in-Time access, and identity governance solutions.
• Experience managing hybrid environments spanning on-premises and Microsoft Azure workloads.
• Experience supporting incident response, forensic preservation, and recovery operations.
• PowerShell scripting and infrastructure automation experience.
• Microsoft certifications such as Azure Administrator, Microsoft 365 Administrator, Security Administrator, or related credentials.
• Experience with virtualization platforms such as VMware or Hyper-V.

What We Offer

As Senior Systems Administrator, you will help strengthen the core technology foundation that supports Ondas Sentinel’s mission, ensuring the systems our teams rely on are secure, resilient, scalable, and ready for growth.

You will work side by side with experts in emerging technology, gaining exposure to cutting edge ideas and projects that are shaping the future. We offer a comprehensive benefits package including Medical, Dental, Vision, and Life Insurance because we believe in taking care of the you as a person, not just a team member.

Our Tucson workplace is designed to support collaboration, focus, and well-being, with an on-site environment that keeps IT, security, infrastructure, engineering, manufacturing, quality, and program teams closely connected to the mission.

We believe in creating a dynamic and inclusive workplace where creativity thrives, and every voice is heard. Our commitment to all team members is built upon five core cultural pillars: Engage, Lean In, Create, Care, and Own. Together, these pillars form the foundation of our employee experience while adhering to the highest standards of ethical and sustainable practices.

Some Final Notes

The description gives you a sense of what the position involves, but is not an exhaustive list. We are a growing and evolving team, which means your responsibilities may shift or expand over time as new opportunities arise. Flexibility and curiosity are part of what make our work exciting!

At Ondas Sentinel, we are proud to be an equal opportunity employer. We celebrate belonging and diversity and are committed to creating an inclusive environment for all team members. We welcome applications from every background and life experience because we know our differences make us stronger.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.