About the Role Leonardo Electronics US Inc. is seeking a hands-on Sr. Systems Engineer to manage network and cloud infrastructure for a growing defense technology company operating across 2–3 sites in Tucson, AZ. You'll be the go-to technical expert for our Cisco Meraki environment and Microsoft Azure GCC High tenant — two domains you'll own end-to-end, not just support. If you're the kind of engineer who prefers accountability and breadth over narrow specialization, this role was built for you. What You'll Do Network Infrastructure - Own the full Cisco Meraki environment (MX, MS, MR) — firewall rules, VPN, VLAN segmentation, SD-WAN, wireless, and IDS/IPS — and serve as the organization's Meraki SME. - Manage DNS, DHCP, and internet circuit providers; maintain ISP relationships, circuit diversity, and failover to keep the business running. - Apply Zero Trust principles across the network — microsegmentation, least-privilege access, and identity-based policy enforcement. - Monitor network health and respond to performance and security events; maintain configuration baselines and documentation. Cloud Infrastructure - Administer the Azure GCC High tenant — Entra ID (user lifecycle, conditional access, PIM), virtual machines, virtual networking, NSGs, and VPN/ExpressRoute connectivity. - Keep M365 GCC High running smoothly — Exchange Online, SharePoint Online, and Teams — in coordination with the support team. - Monitor the cloud environment with Azure Monitor, Defender for Cloud, and Sentinel; tune alerts and respond to incidents with the security team. Infrastructure Operations - Manage on-premises virtualization (VMware or Hyper-V), storage (NAS/SAN), backup (Veeam or Azure Backup), and infrastructure monitoring — keeping systems healthy and recoverable. - Automate repetitive tasks and provisioning workflows using PowerShell, Python, or IaC tools; document what you build so the team can support it. - Lead DR planning and testing; ensure RTO/RPO targets are defined, tested, and achievable. - Mentor junior team members and serve as the escalation point for complex infrastructure issues. What You Bring Required - 7–10 years in IT systems engineering or infrastructure administration - Cisco Meraki — hands-on MX, MS, and MR administration; Meraki Dashboard proficiency - Microsoft Azure (GCC High or commercial) — Entra ID, Azure networking, Defender for Cloud, Intune - Networking fundamentals — TCP/IP, DNS, DHCP, VLANs, BGP/OSPF, firewall management, VPN, SD-WAN - Zero Trust — practical experience with microsegmentation, identity-based access, or least-privilege network design - Backup and DR — Veeam, Azure Backup, or equivalent; RTO/RPO planning and testing - Scripting — PowerShell required; Python or Bash a plus - CompTIA Security+ CE (DoD 8140 compliant) Preferred - Azure GCC High tenant experience - Microsoft Sentinel — KQL queries, analytic rules, playbook automation - Virtualization — VMware vSphere/vCenter or Hyper-V - Storage — NAS/SAN provisioning and administration - Azure certifications: AZ-104, AZ-800, AZ-305, or AZ-700 - Cisco Meraki ECMS certification Education - Bachelor's degree in Computer Science, Information Technology, or a related field, or equivalent hands-on experience Logistics - Location: Tucson, AZ (on-site) - Travel: ~10% (approximately one week per quarter) - Clearance: No active clearance required; ability to obtain may be required in the future [NOTE: The above statements are intended to describe the general nature and level of work being performed by people assigned to this classification. They are not to be construed as an exhaustive list of all responsibilities, duties, and skills required of personnel so classified. All personnel may be required to perform duties outside of their normal responsibilities from time to time, as needed.] Leonardo is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, sexual orientation, gender identity, disability status, protected veteran status, or any other characteristic protected by law. Here are the hiring process steps and what you can expect from us: Step 1: Application Review: Upon submitting your application, it is made available to the recruitment team to review and ensure you meet the basic qualifications. Step 2: Interview: If you have been identified to move forward in the process, you may be invited to participate in a one-on-one or panel interview. The interview format can be a phone call, in-person, or virtual meeting. Step 3: Offer: If you reach this stage of the interview process, congratulations! You will be provided an offer to join the Leonardo Electronics US Inc. team. The offer will include details about your salary, benefits package and start date.