Senior Systems Engineer Job Tucson area,Arizona USA,IT/Tech

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 (user lifecycle, conditional access, PIM), virtual machines, virtual networking, NSGs, and VPN/Express Route 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 Power Shell, 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 , 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 — Power Shell 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

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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.