Unix Administrator jobs in Toronto, ON

Systems Administrator III (Linux)

Your Moneris Career – The Opportunity

As a Systems Administrator III (Linux), you will engineer, automate, secure, and continuously improve the enterprise Red Hat Enterprise Linux (RHEL) platform that underpins Moneris’ business-critical payments services across on-premises data centers and cloud.

This is a senior, hands-on infrastructure role centered on operating and modernizing a large-scale RHEL estate of thousands of virtual machines spanning development through mission-critical production. You will build reusable automation at scale with Ansible, Python, and Bash; drive lifecycle management through patching, upgrades, and migrations; and harden the environment against payments-industry compliance standards. Working independently with sound judgment, you will partner with Platform, Site Reliability Engineering (SRE), Cloud Operations, Information Security, and Infrastructure Architecture teams to deliver a consistent, resilient, and secure operating environment. You will also mature service ownership, mentor less-experienced colleagues, and reduce operational drift through standards-based engineering.

Your Moneris Career – What you'll do

• Administer, maintain, and support a large-scale RHEL estate of thousands of virtual machines across development, test, and mission-critical production.

• Build and maintain reusable automation at scale using Red Hat Ansible, Bash, Python, and GitHub to enforce standards and reduce manual effort.

• Manage platform currency through patching, upgrades, in-place migrations, remediation, and decommissioning using Red Hat Satellite and Hybrid Cloud Console.

• Lead and support projects covering implementation, modernization, service transition, and operational readiness across hybrid infrastructure.

• Troubleshoot complex issues to root cause across operating system, compute , storage, virtualization, identity, and network-adjacent layers.

• Support server hardening, vulnerability remediation, and compliance activities within a least-privilege, PCI DSS-regulated environment.

• Manage incidents, requests, problems, and changes in ServiceNow, aligned to enterprise ITIL change management processes.

• Create and maintain build standards, automation playbooks, technical documentation, diagrams, and knowledge base articles.

Your Moneris Career – What you bring

Required qualifications

• Minimum 3 years administering and supporting Red Hat Enterprise Linux 7/8/9/10 on x86_64 at enterprise scale, including thousands of VMs across multiple environments.

• Extensive hands-on automation experience with Red Hat Ansible, Bash, Python, and GitHub to deliver standards-based, consistent, secure environments at scale.

• Strong experience with Linux build, patching, upgrade, in-place migration, and decommissioning workflows, including Red Hat Satellite and Hybrid Cloud Console.

• Experience integrating RHEL with Active Directory using SSSD and Kerberos keytabs within a least-privilege security model.

• Experience with virtualization such as VMware vSphere or Nutanix AHV and supporting Infrastructure as a Service (IaaS) virtual machines in Microsoft Azure.

• Demonstrated root-cause troubleshooting across OS, compute , storage, virtualization, and network-adjacent layers, with a record of continuous service improvement.

• Working knowledge of IPv4 fundamentals, network segmentation, PKI, backup, recovery, and disaster recovery concepts, plus ServiceNow and ITIL processes.

Preferred qualifications

• Experience in a regulated industry, ideally payments or Payment Card Industry Data Security Standard (PCI DSS) environments.

• Familiarity with server hardening using Center for Internet Security (CIS) benchmarks and National Institute of Standards and Technology (NIST) guidelines, with tools such as Microsoft Defender, OpenSCAP , and Forta Tripwire.

• Experience with CyberArk Privileged Access Management and Conjur secrets management , Venafi, Azure Arc, and Microsoft Defender for Endpoint (ATP).

• Exposure to container-based infrastructure, DevOps pipelines, and observability tooling such as CheckMK and Dynatrace, plus GlusterFS /FUSE, NFS, and Postfix.

What you get

• Emphasis on Wellness - Meeting Free Fridays (MF2), company-wide holiday closure, just to name a few

• RRSP matching & defined contribution pension plan

• Flexible benefits package starting from day 1

• Thrive in a Hybrid or Remote Model - including a tech peripheral rebate!

• Extensive learning & development programs and resources - plus unlimited free access to LinkedIn Learning and Udemy courses!

• EAP (Employee Assistance Program), Educational Assistance and Recognition Program

• Employee perk program with incredible discounts for over 2,400 vendors!

• Get involved in one or many of our Moneris Committees and Employee Resource Groups - Inclusive Workplace Council (IWC), Black Employee Network, just to name a few