Network, Security & Cloud Infrastructure Manager

Greenhill School • Dallas, TX

2d

About The Position

The Network, Security & Cloud Infrastructure Manager partners with the Director of Technology to ensure the performance, resiliency, and security of the School’s network, cloud, identity, virtualization, cybersecurity, and enterprise systems. This senior-level, hands-on role advances cybersecurity, disaster recovery, business continuity, and cloud infrastructure while providing front-line support, serving as an escalation point for complex issues, and establishing standards, governance, and guardrails that enable faculty, staff, and students to use cloud services, artificial intelligence, automation, and software development safely.

This is a full-time, 12-month, exempt-level position. Most work takes place during normal school hours, with after-hours support required during maintenance windows, infrastructure emergencies, and cybersecurity incidents. The position works primarily in an office or classroom environment and interacts frequently with faculty, staff, students, parents, and alumni. Some flexibility in start and end times is available, and light travel for professional development is possible.

Requirements

• Bachelor’s degree in a technology-related field.
• At least 8 years of related work experience.
• Deep, hands-on experience with Cisco Meraki firewalls, switching, wireless networks, and security services.
• Extensive experience with Proxmox, VMware, Hyper-V, Windows and Linux servers, storage, patch management, and infrastructure troubleshooting.
• Demonstrated ability to investigate, hunt, detect, triage, contain, and remediate threats, with practical experience using advanced security products such as Microsoft Defender, Red Canary, SentinelOne, Arctic Wolf, or FireEye.
• Strong knowledge of the Microsoft 365 ecosystem across cloud and on-premises environments, including Azure, Entra ID, Intune, Active Directory, DNS, Windows, Microsoft Defender, Microsoft Purview, and related identity and data-protection services.
• Current experience with cybersecurity frameworks, risk management, security monitoring, data protection, backup, disaster recovery, business continuity, and cloud-based solutions such as Azure or AWS.
• Strong troubleshooting, project-management, documentation, analytical, written, and verbal communication skills.
• Ability to work independently, prioritize complex work, manage multiple assignments, and make decisions within a budget process.
• Collaborative, security-first mindset that enables innovation and creativity; commitment to customer service, confidentiality, teamwork, and building standards, processes, and guardrails for long-term organizational success.
• Ability to maintain appropriate professional boundaries with students, fellow staff, and all community members.

Nice To Haves

• Experience in K-12, higher education, or nonprofit environments.
• Experience with Microsoft Sentinel, SIEM, and incident-response tooling.
• Experience with Azure App Services, Functions, SQL, and cloud-native hosting.
• GitHub administration experience.
• Experience with vulnerability and penetration testing.
• AI governance experience.
• Experience with PowerShell, Python, or similar automation languages.
• Certifications such as CCNA, Cisco Meraki Solutions Specialist, Microsoft Azure Administrator Associate, Azure Security Engineer Associate, Cybersecurity Architect Expert, CISSP, CompTIA Security+, or Network+.

Responsibilities

• Administer, maintain, and modernize the School’s wired and wireless network, Cisco Meraki security infrastructure, Proxmox virtualization, Windows and Linux servers, enterprise storage, and related systems.
• Monitor infrastructure performance, capacity, availability, patching, and lifecycle; maintain architecture documentation; recommend upgrades and modernization initiatives; and provide hands-on support for complex infrastructure issues.
• Design, implement, and govern Microsoft Azure infrastructure and services, including standards for secure cloud provisioning, resource utilization, lifecycle management, and appropriate use of cloud services.
• Serve as a senior, hands-on member of the cybersecurity team and a primary contact for cybersecurity incidents.
• Lead threat detection, hunting, triage, containment, remediation, and post-incident review; coordinate vulnerability assessments and penetration testing; and administer Microsoft Defender, Red Canary, and related security controls.
• Develop, maintain, monitor, and regularly validate on-premises and cloud backup, recovery, and disaster-recovery processes; collaborate with the Director of Technology on business continuity and organizational resilience.
• Establish and govern secure development environments, source-code repositories, application hosting, authentication, secrets, APIs, cloud resources, and deployment workflows for faculty, staff, and student software-development initiatives.
• Establish secure deployment standards and maintain governance for internally developed applications, including ownership, privacy, security, supportability, lifecycle, and retirement requirements.
• Help evaluate and govern emerging technologies, including generative AI; establish standards and guardrails for AI-assisted software development, AI coding assistants, application-development tools, and cloud-based AI services.
• Lead infrastructure, cybersecurity, cloud, and modernization projects; develop technical standards, policies, procedures, and documentation; and evaluate vendors, managed services, products, and solutions aligned with organizational goals.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior