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Added 12 mins ago
S
Administrateur(-trice) de contrats / Contracts Administrator
Smardt
Dorval, QC
- Full-time
Solides compétences en communication écrite et capacité de préparer des sommaires et de courtes notes de service clairs.
Added 12 mins 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 12 mins ago
YO
Financial Administrator, Child Care
YMCA of Hamilton|Burlington|Brantford
Burlington, ON
- Full-time
Deliver high-quality customer service for families - answer phone/emails, direct client to appropriate person, process registrations, send out confirmation letters, process change of…
Added 12 mins 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 25 mins ago
S
Administrateur(-trice) de contrats / Contracts Administrator
Smardt
Dorval, QC
- Full-time
Solides compétences en communication écrite et capacité de préparer des sommaires et de courtes notes de service clairs.
Added 40 mins ago
CL
Housing Administrator - CLC
Campus Living Centres
Calgary, AB
- Full-time
The Housing Administrator provides the overall administration of the housing components as it relates to student housing. The Housing Administrator reports to the Residence Services…
Added 42 mins 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 53 mins ago
BC
Executive Advisor, Legal Services
Build Canada Homes | Maisons Canada
ON · Ontario, Canada
- Full-time
Added 53 mins ago
SH
SAP Contract Administrator (12-Month Term)
Siemens Healthineers
Oakville, ON
- Full-time
The SAP Contract Administrator is responsible for processing of all commercial/financial aspects of our daily business during the project realization phase for our long-term Healthineers…
Added 53 mins ago
RB
IT Operations Team Lead
Robert B. Somerville Co. Limited
King City, ON
- Full-time
…long-term partnerships, operational excellence, and safe, reliable service…
Added 55 mins ago
DG
Sales Administrator
Dilawri Group of Companies
North Vancouver, BC
- Full-time
The Sales Administrator at North Shore Honda plays a key role in supporting the Sales Manager, General Manager, and Sales team to ensure smooth and efficient dealership operations. This…
Added 55 mins ago
S
Senior Specialist, IT Operations (Service Management)
SaskPower
Regina, SK
- Full-time
…the value of the ServiceNow platform and support continual service improvement…
Added 56 mins ago
Operations Administrator (BDL)
Brewers Retail Inc
Edmonton, AB
We are currently searching for an Operations Administrator reporting to the Supervisor, Operations. This vacancy is a Full-Time Permanent opportunity. The Operations Administrator plays a…
Added 56 mins 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 1 hour ago
TW
Director of Environmental Services (Temporary)
The Wellington
Hamilton, ON
- Full-time
● Liaises with outside service contractors and inspectors to assure equipment and environment conform to applicable
Added 1 hour ago
HC
Senior Platform Administrator (Salesforce) - ITS - FT Support
Humber College
Toronto, ON
- Full-time
Position Title: Senior Platform Administrator - Salesforce
Added 1 hour ago
UO
Education Program and Admin Assistant
University of Manitoba
Winnipeg, MB
- $48,448.4 to $66,266.2 CAD / year
- Full-time
…that contribute to excellence in healthcare, teaching, and…
Added 1 hour ago
P1
Office Administrator
Point 1 Displays
Montreal, QC
- Full-time
…offering tailored solutions, ensuring exceptional customer service, and delivering high-quality products at cost-effective rates. Headquartered in Montreal, Canada, we manage every stage of…
Added 1 hour ago
GE
Administrateur (trice) Service à la Clientèle / Customer Service Administrator
GFL Environmental Inc.
Saint-Hyacinthe, QC
- Full-time
Vous aimez le service à la clientèle et le travail d’équipe? Joignez-vous à GFL Environnement à titre d’administratif(ve) / Représentant(e) du service à la clientèle (CSR) à St-Hyacinthe.
Added 1 hour ago
LF
Securities Administrator (Vancouver/Toronto)
Leede Financial Inc.
Vancouver, BC
- Full-time
Leede Financial is one of Canada’s leading full-service investment dealers and provides a full range of investment products and services to clients all across Canada. Our diverse group of…
Added 1 hour ago
LF
Registered Plans Administrator
Leede Financial Inc.
Toronto, ON
- Full-time
Leede Financial is one of Canada’s leading full-service investment dealers and provides a full range of investment products and services to clients all across Canada. Our diverse group of…
Added 1 hour 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
Added 1 hour ago
Legal & Compliance Specialist
WF Group Inc.
Toronto, ON · Kitchener, ON
Conduct substantive first-level reviews of client agreements, master service agreements, amendments, consultant and subconsultant agreements, NDAs, procurement documents, and related…
Added 1 hour ago
AF
Payroll Administrator
Agri Foods
Burnaby, BC
- Full-time
ROLE: Payroll Administrator (13-month contract)
Added 2 hours ago
NA
LR267916 Walk-In Service - Business Support Administrator
NHS Ayrshire & Arran
Richmond, BC
- Full-time
The Walk In Service hosted by Out Of Hours Primary Care (GMED) service is currently looking to recruit Business Support Administrator to join our dynamic and responsive team.

OnX

Sr. Engineer System administrator

Toronto, ON, Canada

Full-time

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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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