Senior System Administrator

Location:

Markham, ON Posted: 10/9/2026 Location Name: HSIO-Markham

Wage Max:  Wage Min:

Amphenol Communications Solutions (ACS), a division of Amphenol Corporation, is a world leader in interconnect solutions for Communications, Mobile, RF, Optics, and Commercial electronics markets. Amphenol Corporation is one of the world’s largest designers and manufacturers of electrical, electronic and fiber optic connectors and interconnect systems, antennas, sensors and sensor-based products and coaxial and high-speed specialty cable. ACS has an expansive global presence in research and development, manufacturing, and sales.

We design and manufacture a wide range of innovative connectors as well as cable assemblies for diverse applications including server, storage, data center, mobile, RF, networking, industrial, business equipment, and automotive.

Amphenol () is a Fortune 500 company and one of the largest manufacturers of interconnect products in the world. We design, manufacture, and market electrical, electronic, and fiber optic connectors, coaxial and flat-ribbon cable, and interconnect systems. The primary end markets for our products include communications and information processing, aerospace, military electronics, automotive, and other industrial applications.

Job Description
The Senior System Administrator will lead the design, modernization, security, and compliance of our IT infrastructure across on-premises and cloud environments, with a primary focus on Microsoft Azure. This role leads and mentors a team of System Administrators, owns the infrastructure roadmap, and drives the transition from legacy systems to secure, scalable, and automated platforms. The ideal candidate brings 5 to 8 years of hands‑on experience, deep expertise in Azure, Windows Server, Microsoft Entra , and Microsoft 365, and a proven track record of leading teams, delivering modernization projects, and maintaining a strong security and compliance posture.

Roles & Responsibilities

Team Leadership:
Lead, mentor, and manage a team of System Administrators. Assign and prioritize work, set performance goals, conduct reviews, and build team capability through coaching, knowledge sharing, and training.

Infrastructure Architecture:
Design, document, and own the end‑to‑end architecture for on‑premises, hybrid, and cloud infrastructure, including servers, storage, identity, networking, and backup, ensuring scalability, high availability, and cost‑efficiency.

Azure Cloud Management:
Architect and manage the Azure environment, including landing zones, subscription and resource governance, Azure VMs, Virtual Networks, Azure Backup and Site Recovery, Azure Files, Azure Monitor, Azure DNS, Key Vault, and Azure Policy. Optimize cloud spend through Azure Cost Management and right‑sizing.

IT Modernization:
Build and execute the infrastructure modernization roadmap: migrate legacy workloads to Azure, upgrade or retire end‑of‑life systems, adopt PaaS/SaaS where appropriate, and introduce automation and Infrastructure as Code (Power Shell, Bicep/ARM, or Terraform).

Identity & Endpoint Management:
Oversee Active Directory, Microsoft Entra , Group Policy, and hybrid identity. Drive adoption of Conditional Access, MFA, Privileged Identity Management (PIM), and modern endpoint management through Intune and Autopilot.

M365 Administration:
Govern Microsoft 365 services including Exchange Online, Intune, Teams, SharePoint Online, and One Drive. Ensure secure, reliable, and well‑governed operation of the Microsoft 365 environment.

Security Operations:
Define and enforce the infrastructure security baseline, including system hardening, patch and vulnerability management, Microsoft Defender, SIEM monitoring (e.g., Microsoft Sentinel),…