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Added 13 mins ago
PE
HSE Administrator
Phasor Engineering Inc
Calgary, AB
- Full-time
We are seeking an organized, proactive, and people-focused HSE Administrator to join our team. In this role, you will support the administration and continuous improvement of Phasor…
Added 42 mins ago
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Facility Manager III
BGIS
Orillia, ON
- Full-time
Added 42 mins ago
PB
Senior Specialist, Payroll and Benefits
Pacific Blue Cross
Burnaby, BC
- Full-time
This is an excellent opportunity for an experienced payroll and benefits professional who enjoys combining technical expertise with process improvement, problem-solving, and employee…
Added 42 mins ago
B
General Repair Technician II
BGIS
Vancouver, BC
- Full-time
Performs regular facility technical and non-technical component monitoring and inspection.
Added 1 hour ago
B
General Repair Technician II
BGIS
Vancouver, BC
- Full-time
Performs regular facility technical and non-technical component monitoring and inspection.
Added 1 hour ago
HW & SW Applications Admin 1
Celestica International LP
Toronto, ON
We are seeking a highly technical, execution-focused Hardware & Software Engineering Applications System Administrator to support the core engineering applications environment for the…
Added 1 hour ago
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Service Administrator
Wajax
Edmonton, AB
- Full-time
Work in collaboration with the technical team.
Added 1 hour ago
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HW & SW Applications Admin 1
Celestica
Toronto, ON
- Full-time
We are seeking a highly technical, execution-focused Hardware & Software Engineering Applications System Administrator to support the core engineering applications environment for the…
Added 1 hour ago
SC
Service Now Administrator & Developer
Sheridan College
Oakville, ON
- Full-time
…service and Sheridan business processes the incumbent performs technical and business analysis to build roadmaps for the purpose of developing enhancements, interfaces, fixes, and the…
Added 1 hour ago
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Administrateur(-trice) de contrats / Contracts Administrator
Smardt
Dorval, QC
- Full-time
Added 1 hour ago
BG
Learning Management System Administrator
Brandt Group of Companies
Regina, SK
- Full-time
Brandt Corporate Services Ltd. is currently seeking a Learning Management System (LMS) Administrator for our Regina, SK, location.
Added 1 hour ago
SD
Online Learning Facilitator
Sask DLC
Imperial, SK · Holdfast, SK
- Part-time
Follow school-based administrator’s expectations for creating DLCgo accounts/new applications, requesting courses, approving course request, course selections, drops, etc.
Added 2 hours ago
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Administrateur(-trice) de contrats / Contracts Administrator
Smardt
Dorval, QC
- Full-time
Added 2 hours ago
HI
Sales Resources Administrator
HUB International
Toronto, ON
- Full-time
We’re looking for a dynamic Sales Resource Administrator to be a key support partner to our regional sales enablement team. This role is perfect for a candidate who enjoys working in a…
Added 2 hours ago
BC
Executive Advisor, Legal Services
Build Canada Homes | Maisons Canada
ON · Ontario, Canada
- Full-time
Provides technical, administrative, and/or supervisory guidance and leadership to other administrative support staff as required. Provides back-up to the Executive Assistant to the…
Added 2 hours ago
RB
IT Operations Team Lead
Robert B. Somerville Co. Limited
King City, ON
- Full-time
The IT Operations Team Lead is a hands-on technical leader responsible for the day-to-day coordination, reliability, security, and continuous improvement of the organization’s IT operations…
Added 2 hours ago
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Senior Specialist, IT Operations (Service Management)
SaskPower
Regina, SK
- Full-time
…implementation of the ServiceNow platform. This role will serve as a technical subject matter expert responsible for supporting existing ServiceNow capabilities while driving the adoption…
Added 2 hours ago
Senior Administrator, Core Datastorage
Domtar Products
Montreal, QC
The location in Montreal, (Quebec, Canada), is seeking talent to fill the position of Senior Administrator, Core Datastorage. This job is full-time permanent.
Added 2 hours ago
TW
Director of Environmental Services (Temporary)
The Wellington
Hamilton, ON
- Full-time
Essential Duties are the technical skills and knowledge that an employee requires in order to perform their role. Below is
Added 3 hours ago
HC
Senior Platform Administrator (Salesforce) - ITS - FT Support
Humber College
Toronto, ON
- Full-time
Position Title: Senior Platform Administrator - Salesforce
Added 3 hours ago
WI
Senior Construction Inspector
WSP in Canada
Sarnia, ON
- Full-time
It’s why we bring people together who are wired to solve complex challenges - engineers, scientists, advisors, and technical experts who are driven by a common passion - to redefine what’s…
Added 3 hours ago
WI
Senior Construction Inspector
WSP in Canada
London, ON
- Full-time
It’s why we bring people together who are wired to solve complex challenges - engineers, scientists, advisors, and technical experts who are driven by a common passion - to redefine what’s…
Added 3 hours ago
BP
Senior Production Engineer Scheduling
BNP Paribas
Montreal, QC
- Full-time
…in EMEA, the production Engineer will be accountable for the technical support as well as the projects delivery for the Production and non-production…
Added 3 hours ago
WC
CUPE - 0.5 FTE Educational Assistant (HN) - Assistive Technology (A-TECH) - Notre Dame CSS
Waterloo Catholic District School Board
Kitchener, ON
- Internship
Demonstrate the ability to problem solve technical solutions of assistive technology software/hardware.
Added 3 hours ago
L
Technical Support (Linux, Zabbix, & ServiceNow REQUIRED)
Luxoft
Toronto, ON
- $85,000 to $100,000 USD / year
- Full-time
Atlassian tools (Jira, Wiki) - both as user and as administrator

OnX

Sr. Engineer System administrator

Toronto, ON, Canada

Full-time

Apply About employer

Applications open in a new tab.

Job details

Job type: Full-time
Apply by: Nov 5, 2026
Posting language: English
Posted: Oct 6, 2026

Original job description

OnX is a leading Canadian technology solutions provider helping organizations modernize, secure, and optimize their IT environments. We partner with clients across industries to deliver innovative infrastructure, cloud, security, and managed services solutions that drive business success.

We are seeking a highly skilled Senior Systems Administrator to join our Infrastructure Services team. This role is ideal for a hands-on technical professional who thrives in complex enterprise environments and enjoys managing mission-critical server infrastructure across Windows, Linux, and cloud platforms.

What You'll Do

As a Senior Systems Administrator, you will be responsible for maintaining, optimizing, and securing enterprise server environments while ensuring the highest levels of performance, availability, and compliance.

Key Responsibilities

Administer and support enterprise Windows and Linux server environments.
Perform operating system installation, configuration, patching, upgrades, and lifecycle management.
Monitor system health, performance, and availability, proactively identifying and resolving issues.
Implement infrastructure improvements that enhance scalability, resiliency, and operational efficiency.
Manage enterprise security baselines, vulnerability remediation efforts, and system hardening activities.
Support cloud-based infrastructure across AWS and Microsoft Azure environments.
Automate operational processes using scripting and automation tools.
Collaborate with networking, security, application, and cloud teams to deliver integrated technology solutions.
Perform capacity planning and growth forecasting for server and compute environments.
Maintain technical documentation, operational procedures, and knowledge articles.
Mentor junior team members and provide technical guidance on infrastructure best practices.

Required Qualifications

Education

Bachelor's degree in Computer Science, Information Technology, Engineering, Telecommunications, or a related technical discipline.

Experience

6+ years of overall IT infrastructure experience.
5+ years of hands-on systems administration experience in enterprise environments.

Technical Skills

Required

Linux Administration
Windows Server Administration (Wintel)
Unix Administration
Infrastructure Monitoring and Troubleshooting
Operating System Patching and Maintenance
Performance Optimization
Security Hardening and Compliance
Server Lifecycle Management

Preferred

AWS Administration
Microsoft Azure Administration
Citrix XenServer
Sun Solaris
AS/400
WSUS
Python
Bash Scripting
PowerShell

Desired Competencies

Infrastructure Provisioning & Configuration Management
Performance Monitoring & Optimization
Virtualization Technologies
Automation & Scripting
Security & Compliance Management
Capacity Planning & Resource Management
Strong Problem-Solving Skills
Effective Communication
Ownership and Accountability
Collaboration and Teamwork
Customer-Focused Mindset

Success Measures

In this role, success will be measured through:

Infrastructure uptime and SLA achievement
Reduced incident resolution times (MTTR)
Security compliance and vulnerability remediation performance
Increased automation and operational efficiency
Adherence to infrastructure standards and governance practices

Why Join OnX?

Work with modern infrastructure and cloud technologies.
Collaborate with experienced technology professionals across Canada.
Gain exposure to enterprise-scale environments and strategic initiatives.
Competitive compensation and benefits package.
Professional development and certification support.
Flexible work options depending on role requirements.

CAD $62,000 – $82,000 base salary (not including bonus or commission)

The compensation range in this posting reflects the Company’s good‑faith estimate at the time of publication. The applicable base pay range for any individual will be determined based on the candidate’s designated primary work location as well as factors including role scope and responsibilities, required qualifications, and the individual’s experience, education, skills, knowledge, and performance. Certain positions may also be eligible for additional compensation such as discretionary merit increases, bonuses, or sales‑based variable compensation in accordance with applicable plans and role requirements.

Diversity & Inclusion

OnX is an equal opportunity employer committed to creating an inclusive environment for all employees. We celebrate diversity and are dedicated to fostering a workplace where everyone can thrive regardless of race, religion, gender, age, disability, sexual orientation, or any other protected characteristic.

Apply About employer

More about this job

Responsibilities

Administer, maintain, secure, and optimize enterprise Windows and Linux server environments, including operating system lifecycle management, monitoring, troubleshooting, and cloud infrastructure support across AWS and Azure. Improve infrastructure resilience and efficiency through automation, capacity planning, documentation, cross-team collaboration, and mentoring junior team members.

Requirements

Requires a bachelor's degree in Computer Science, Information Technology, Engineering, Telecommunications, or a related technical discipline, along with at least six years of overall IT infrastructure experience. Candidates must have at least five years of hands-on enterprise systems administration experience and skills in Linux, Windows Server, Unix, monitoring, patching, performance optimization, security, and server lifecycle management.

Skills

Linux Administration
Windows Server Administration
Unix Administration
Infrastructure Monitoring
Troubleshooting
Operating System Patching
Performance Optimization
Security Hardening
Compliance Management
Server Lifecycle Management
AWS Administration
Citrix XenServer
Sun Solaris
Python
PowerShell

Benefits

Professional Development Support
Certification Support
Flexible Work Options

Visa sponsorship

Not detected in the job text

Keywords

Linux
Windows Server
Unix
AWS
Microsoft Azure
Citrix XenServer
Sun Solaris
AS/400
WSUS
Python
Bash
PowerShell
Infrastructure Monitoring
Troubleshooting
Operating System Patching
Performance Optimization
Security Hardening
Compliance
Server Lifecycle Management
Infrastructure Provisioning
Configuration Management
Virtualization
Automation
Capacity Planning
Vulnerability Remediation
Enterprise Infrastructure
Cloud Infrastructure
Incident Resolution
Service Level Agreements
Technical Documentation

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