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Added 12 mins ago
E
Network RF Engineer
ELITS
Mississauga, ON
- Full-time
ELITS is looking for a Network RF Engineer to support our operations in Mississauga, Ontario.
Added 25 mins ago
GC
Senior Engineer, Process Maintenance
Glencore Canada
Sparwood, BC
- $115,000 to $145,000 CAD / year
- Full-time
Reporting to the Senior Engineering Supervisor, Processing, the Senior Engineer, Process Maintenance is responsible for identifying, evaluating, and effectively implementing maintenance…
Added 25 mins ago
K
Application Engineer - AMR
KUKA
Mississauga, ON
- Full-time
Senior Application Engineer (~10+ years experience)
Added 25 mins ago
EI
Vice President, Municipal Engineering
Egis in Canada
Toronto, ON
- Full-time
This is a senior leadership role combining accountability with recognized technical authority across municipal infrastructure.
Added 25 mins ago
EI
Project Manager, Senior Civil Engineer - Land Development
Egis in Canada
Ottawa, ON
- $115,000 to $140,000 CAD / year
- Full-time
…bridges/culverts, water/wastewater conveyance, and stormwater management…
Added 25 mins ago
EI
Senior Water Resources Engineer
Egis in Canada
AB · Edmonton, AB
- $105,000 to $130,000 CAD / year
- Full-time
The Senior Water Resources Engineer position is based in Edmonton, Alberta, Canada and is responsible for the planning, analysis, and delivery of water resources engineering and hydraulic…
Added 25 mins ago
I
Senior Systems Engineer
illumin
Toronto, ON · Greater Toronto Area, Canada
- $100,000 to $150,000 CAD / year
- 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 25 mins ago
FG
Founding Robotics Engineer – Autonomous Golf Mowers
Foxbridge Golf Club
Toronto, ON
- Full-time
We are starting from the ground up and looking for a talented, entrepreneurial Robotics Engineer to lead the technical development of this project from concept to working prototype.
Added 25 mins ago
HP
Sr Manager, Business Analytics
Hill's Pet Nutrition
Toronto, ON
- $143,100 to $166,950 CAD / year
- Full-time
…thinking, and people leadership, with significant exposure to senior stakeholders across Hill’s and the broader Colgate-Palmolive…
Added 25 mins ago
Y
Senior QA Automation Engineer (Playwright)
Yochana
Montreal, QC
- Full-time
Position Name – Senior QA Automation Engineer
Added 27 mins ago
R
Stage - Hiver 2027 - Développement Logiciel Avancé, Méthodes Numériques / Internship - Winter 2027 - Advanced Software Development, Numerical Methods
RTX
Longueuil, QC
- Full-time
Added 27 mins ago
Q
Engineer in Training - Protection & Control
Qualus
Vancouver, BC
- Full-time
Support the design of protection, control, and metering systems for electrical substations (12 kV to 500 kV) under the guidance of senior engineers
Added 42 mins ago
L
Senior Analytics Engineer
Lime
Remote, Canada
- $100,000 to $138,000 CAD / year
- Full-time
- Remote
Lime is hiring a Sr. Analytics Engineer to join our Corp Tech Data and Integrations Team. You will report to Lime’s Corp Tech Analytics Manager in the Enterprise Engineering space and…
Added 42 mins ago
EG
Rail Requirements Management Specialist
Egis Group
Toronto, ON
- $120,000 to $140,000 CAD / year
- Full-time
Reference applicable standards applicable such as ISO/IEC 15288 and INCOSE (International Council on Systems Engineering) guideline, AREMA (American Railway Engineer and Maintenance of way…
Added 42 mins ago
EG
Senior Water Resources Engineer
Egis Group
Edmonton, AB
- $105,000 to $130,000 CAD / year
- Full-time
The Senior Water Resources Engineer position is based in Edmonton, Alberta, Canada and is responsible for the planning, analysis, and delivery of water resources engineering and hydraulic…
Added 54 mins ago
EI
Rail Requirements Management Specialist
Egis in Canada
Toronto, ON
- $120,000 to $140,000 CAD / year
- Full-time
Reference applicable standards applicable such as ISO/IEC 15288 and INCOSE (International Council on Systems Engineering) guideline, AREMA (American Railway Engineer and Maintenance of way…
Added 54 mins ago
O
Sr. Engineer System administrator
OnX
Toronto, ON
- Full-time
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…
Added 54 mins ago
S
Senior Application Support Engineer (m/f/d)
Solactive
Toronto, ON
- Full-time
…market connectivity, trading platforms, and real‑time financial systems. You will support and enhance our proprietary index and market‑data platforms across distributed Linux environments,…
Added 54 mins ago
KG
Senior Java Low Latency Developer
K&K Global Talent Solutions INC.
Mississauga, ON
- Full-time
We are seeking an experienced Senior Java Low Latency Developer to join our Payments Processing Development team and help drive the evolution of our next-generation exchange connectivity…
Added 1 hour ago
A
Principal Engineer - Mechanical
AtkinsRéalis
Mississauga, ON
- Full-time
AtkinsRéalis is looking to hire a Senior Mechanical Engineer. This position requires experienced individuals who are self-starter capable of working independently and leading/supervising…
Added 1 hour ago
A
Senior Mechanical Engineer
AtkinsRéalis
Mississauga, ON
- Full-time
The Senior Mechanical Engineer will support refurbishment, retube, field services, and new-build nuclear projects. This role combines design engineering expertise with field execution…
Added 1 hour ago
A
Specialist Engineer - Mechanical
AtkinsRéalis
Mississauga, ON
- Full-time
AtkinsRéalis is looking to hire a Senior Mechanical Engineer. This position requires experienced individuals who are self-starter capable of working independently and leading/supervising…
Added 1 hour ago
T
Senior Mainframe Engineer, TD Securities
TD
Toronto, ON
- Full-time
An Application Engineer with experience and background in real-time event driven systems, Java/Javascript/Typescript development, Databases and Application Integration with knowledge of…
Added 1 hour ago
M
Senior Design Engineer
Multimatic
Markham, ON · Multimatic Technical Centre - South
- Full-time
Multimatic’s Mechanisms Engineering team is looking for talented Senior Design Engineers to help create innovative solutions for the world’s leading OEMs. Our team develops everything from…
Added 1 hour ago
Senior Software Engineer, OIG
Okta
Toronto, ON
Okta Identity Governance (OIG) organization is looking for a Senior Engineer to join our team - OIG is Okta’s Identity Governance and Administration solution that is directly responsible…

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 7, 2026
Posting language: English
Posted: Oct 8, 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 technical guidance for 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 hardening, 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
AS/400
PowerShell

Benefits

Competitive Compensation
Professional Development
Certification Support
Flexible Work Options

Visa sponsorship

Not detected in the job text

Keywords

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

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