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Added 1 hour ago
S
IT Technology Services Senior Specialist - Linux Administration, Hyperscaler, Pacemaker Operations
SAP
Toronto, ON
- Full-time
…of cloud deployment options for our customers with our own infrastructure, our partners and through public cloud…
Added 1 hour ago
R&
End User Systems Support Specialist
Robertson & Company Ltd.
Toronto, ON
- Full-time
The End User Systems Support Specialist plays a key role in ensuring smooth daily operations of the organization’s IT infrastructure and end user technology. This position supports both…
Added 7 hours ago
MT
Senior Infrastructure Engineer (Linux & Cloud Automation)
Manx Telecom Enterprise
Permanent North American Gaeltacht, ON
- Full-time
Job Details: Senior Infrastructure Engineer (Linux & Cloud Automation)
Added 9 hours ago
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Junior Systems Administrator
GraceMed
Oakville, ON
- $50,000 to $60,000 CAD / year
- Full-time
Transform Technology: Join GraceMed as an Junior System Administrator in Oakville!
Added 12 hours ago
CI
Cybersecurity Administrator- Vancouver
Compugen Inc
Vancouver, BC
- Full-time
Position Overview: We are seeking a Cybersecurity Administrator/Infrastructure & Security Operations resource to strengthen our cybersecurity capabilities for a 6 month contract (strong…
Added 12 hours ago
KG
Senior Technology Architect
K&K Global Talent Solutions INC.
Toronto, ON
- Full-time
Client is seeking for skilled Oracle Fusion Cloud OCI & Security Administrator to manage, support, and secure Oracle Cloud Infrastructure (OCI) and Oracle Fusion Cloud environments. The…
Added 12 hours ago
E
Office Administrator
EllisDon
Toronto, ON · ON · Ontario Projects
- Full-time
EllisDon Facilities Services (EDFS) specializes in infrastructure and asset maintenance, operations, and management. We optimize an asset’s efficiency, in order to maximize lifecycle and…
Added 12 hours ago
E
Health, Safety & Environment Administrator
EllisDon
Edmonton, AB · Fort Saskatchewan, AB
- Full-time
…including earthworks, underground utilities, pipelines, and infrastructure…
Added 13 hours ago
SS
Azure Infrastructure Engineer
Sonata Software North America Inc.
Toronto, ON
- Full-time
Azure Security Engineer Associate; Azure Administrator Associate) Candidates must be able to work independently.
Added 13 hours ago
I
Senior Systems Engineer
illumin
Toronto, ON · Greater Toronto Area, Canada
- Full-time
We are hiring a Senior Systems Engineer to join our Infrastructure & Operations team. This is a senior, hands-on infrastructure role focused on Linux systems, virtualization, physical and…
Added 13 hours ago
Bilingual Senior Specialist, Cloud Infrastructure Operations Engineering
CMHC - SCHL
Ottawa, ON · Toronto, ON · Montreal, QC
Join the Technology and Business Transformation team in the Bilingual Senior Specialist, Cloud Infrastructure Operations Engineering position. In this position, you will be responsible for…
Added 14 hours ago
RC
Desktop Administrator II, IT Infrastructure
Ryan Companies US, Inc.
Calgary, AB
- Full-time
The Desktop Administrator II (“Desktop Administrator”) maintains and manages distributed desktop and laptop systems and software, including, but not limited to, installation, configuration,…
Added 15 hours ago
D
Senior DevOps Engineer - Healix
Deloitte
Toronto, ON
- Full-time
We are hiring a Senior DevOps Engineer to own and evolve our cloud platform on AWS, grounded in infrastructure as code, secure multi-account patterns, and reliable delivery. You will shape…
Added 15 hours ago
CC
System Administrator
Confidential Careers
Canada
- Contract
premier global organization - is seeking a highly skilled technical lead to shape and evolve their enterprise infrastructure. In this cross-functional role, you will be the driving force…
Added 15 hours ago
PS
Network Administrator
PlanIT Search
Markham, ON
- $95,000 to $115,000 CAD / year
- Full-time
As a Network Administrator (Global) you are responsible for Provide technical expertise in IT infrastructure and network platforms for global operations. Design and implement infrastructure…
Added 16 hours ago
M
Lead Contracts Administrator
Metrolinx
Canada
- Full-time
…professionals who care deeply about working together to deliver infrastructure and make a positive impact in our communities. Join us as we build a knowledgeable and collaborative team that…
Added 16 hours ago
Project Manager
Government of Alberta
AB
Alberta Infrastructure is responsible for delivering about one quarter of the Alberta government’s Capital Plan, which addresses the provincial infrastructure needs of Alberta’s population…
Added 16 hours ago
E
Health, Safety & Environment Administrator
EllisDon
AB · Edmonton, AB
- Full-time
…including earthworks, underground utilities, pipelines, and infrastructure…
Added 16 hours ago
Technology Lead
Infosys
ON
Infosys is seeking an experienced Databricks Administrator with strong expertise in managing, securing, and optimizing Databricks environments on cloud platform: AWS. The ideal candidate…
Added 18 hours ago
PS
Firewall Administrator
PlanIT Search
Markham, ON
- $115,000 to $135,000 CAD / year
- Full-time
Development, maintenance, and continuous improvement of infrastructure and security documentation
Added 18 hours ago
SP
IT Security Administrator
Saskatoon Police Service
Saskatoon, SK
- Full-time
…ensure the continued availability of the information technology infrastructure and operations, including network, server, storage redundancy, offsite backup repository of data and software…
Added 18 hours ago
Project Administrator
Aecon
Kincardine, ON
Aecon delivers some of the most complex and impactful infrastructure projects - from transformative transportation networks to critical energy, industrial and nuclear programs. The projects…
Added 18 hours ago
T&
Project Coordinator/Administrator
Turner & Townsend
Toronto, ON
- Full-time
Working with our clients across real estate, infrastructure, energy and natural resources, we transform together delivering outcomes that improve people’s lives. Working in partnership…
Added 18 hours ago
S
IT System Administrator (Hybrid)
Siemens
Vaughan, ON
- Full-time
Siemens Ruggedcom IT is looking for a highly motivated IT System Administrator with a wide variety of IT knowledge and Project Management skills. In this role, you should be an excellent…
Added 19 hours ago
EI
AWS DEVOPS & INTEGRATION ENGINEER
EMERES INC.
Montreal, QC
- Full-time
…cloud and on-premises systems. Working under the DevOps & Cloud Infrastructure Lead, you'll own customer-facing AWS infrastructure, keep it secure, support our EMERES web applications…

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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