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Added 1 min ago
K
Senior Engineer (Mechanical/Piping Design)
Kinectrics
Kincardine, ON
- Internship
Position: Senior Engineer / Analyst (Mechanical / Piping)
Added 1 min ago
B
Electrical, instrumentation and Control Engineer
Brunel
Oakville, ON
- $61 to $88 CAD / hour
- Contract
Brunel is seeking an experienced Senior Electrical, Instrumentation & Controls Engineer to support the delivery of custom-designed water treatment projects.
Added 1 min ago
ME
Senior Protection & Control Engineer
Morson Edge (Canada)
Burnaby, BC
- $95 to $120 CAD / hour
- Contract
The Engineer E5 is a senior engineering professional responsible for delivering innovative engineering, estimating, planning, and quality management services on medium to high complexity…
Added 2 mins ago
Senior SailPoint Support Engineer
KeyData Cyber
Toronto, ON
We are currently looking to hire a Senior SailPoint IIQ Support Engineer to join KeyData Cyber's Managed Services team who will step in and own our largest and most important customer…
Added 32 mins ago
A
Senior Instrumentation Control and Electrical Engineer
AtkinsRéalis
Mississauga, ON
- Full-time
Come join us in reshaping the future with AtkinsRéalis. We are seeking a highly motivated Senior Instrumentation, Control & Electrical Engineer to join our Retube Tooling & Field Services…
Added 32 mins ago
CO
Servicing Delivery Lead
Capital One
Toronto, ON
- Full-time
Continuously re-engineer existing workflows into target-state solutions, reducing manual effort and driving enterprise-wide operational efficiency.
Added 32 mins ago
H
Senior Software Engineer - AI/ML
Hach
London, ON · Vancouver, BC · CAN - Vancouver - Aquatic Informatics ULC
- $120,000 to $145,000 CAD / year
- Full-time
Reporting to the Director of Engineering & Predictive Analytics, the Senior Software Engineer will contribute to the technical development of Aquatic Informatics' predictive analytics…
Added 32 mins ago
T
Software Engineer I
TD
Toronto, ON
- Full-time
The Risk Technology team is seeking a junior Software Engineer with foundational .NET, Python, and SQL skills. Working with guidance from senior team members, the successful candidate will…
Added 45 mins ago
WI
Lead Instrumentation & Control Engineer, Resources
WSP in Canada
St. John's, NL · Greater St. John's Metropolitan Area
- Full-time
…Greater Toronto Area, Saskatoon SK, St John's NL as a Lead I&C Engineer, you will support as a senior subject matter expert in the instrumentation and controls engineering for both new…
Added 46 mins ago
S
Senior Project Manager - Transportation Engineering & Planning
Stantec
Ottawa, ON
- Full-time
Stantec is seeking an experienced Senior Project Manager - Transportation Engineering & Planning to complement and grow our skilled Transportation Planning & Traffic Engineering (TPTE) Team…
Added 1 hour ago
IS
Senior Full stack Engineer - Node/Angular
Iris Software Inc.
Toronto, ON
- Contract
Title: Senior Full stack Engineer - Node/Angular
Added 2 hours ago
SI
Full Stack Engineer
Stelvio Inc.
Saskatoon, SK
- Full-time
…solutions for complex, real-world environments. Working alongside senior developers, architects, project managers and wider cross-functional teams, you’ll help design, develop and maintain…
Added 3 hours ago
AI
Senior React Native Developer
AI Interviews
Toronto, ON · Greater Toronto Area, Canada
- Contract
We are seeking a Senior/Lead React Native Engineer with 8+ years of mobile engineering and 5+ years of production React Native experience.Strong expertise in React Native 0.76+, New…
Added 4 hours ago
UO
Project Manager, WUSA
University of Waterloo
Waterloo, ON · General Services Complex
- Full-time
Facilities - Design and Construction Services
Added 4 hours ago
M
Senior Full Stack Java Engineer
Miratech
Canada
- Full-time
We are looking for a Senior Full Stack Engineer to design, develop, and support scalable cloud-native applications that power Workforce Management (WFM), Customer Experience (CX), and…
Added 4 hours ago
M
Senior Full Stack Java Engineer - Workforce Management (WFM)
Miratech
Canada
- Full-time
We are looking for a Senior Full Stack Engineer to join the Workforce Management product stream and build enterprise-scale solution supporting forecasting, capacity planning, scheduling,…
Added 4 hours ago
M(
[C] Salesforce Engineer / Developer
MLSE (Maple Leaf Sports & Entertainment Partnership)
Toronto, ON · Scotiabank Arena
- Part-time
MLSE is looking for a Senior Salesforce Loyalty Cloud Administrator/Developer to support the administration, configuration, development, integration, and ongoing optimization of our…
Added 5 hours ago
M
Senior Full Stack Java Engineer
Miratech
Canada
- Full-time
We are looking for a Senior Full Stack Engineer to design, develop, and support scalable cloud-native applications that power Workforce Management (WFM), Customer Experience (CX), and…
Added 5 hours ago
M
Senior Full Stack Java Engineer - Workforce Management (WFM)
Miratech
Canada
- Full-time
We are looking for a Senior Full Stack Engineer to join the Workforce Management product stream and build enterprise-scale solution supporting forecasting, capacity planning, scheduling,…
Added 5 hours ago
EG
Développeur(-euse) de logiciels sénior(e) (contenu) / Senior Software Development Engineer
Expedia Group
Montreal, QC · Canada - Quebec - Montreal
- Full-time
Développeur(-euse) de logiciels sénior(e) (contenu)
Added 5 hours ago
U
Senior Software Engineer, Applied AI & Customer Solutions
Udemy
Toronto, ON
- Full-time
As a Senior Software Engineer, you will join a fast-paced innovation team that builds and deploys AI-powered solutions directly with Coursera's enterprise and campus customers. You will sit…
Added 5 hours ago
A
Intermediate Geotechnical Engineer
AtkinsRéalis
Calgary, AB
- Full-time
We are currently seeking an Intermediate Geotechnical Engineer to join AtkinsRéalis’ Geotechnical team. In this role, you will support a variety of projects for clients primarily within…
Added 5 hours ago
A
Senior Geotechnical Engineer
AtkinsRéalis
Toronto, ON · Vaughan, ON
- Full-time
This is a great opportunity for an experienced Geotechnical Engineer with good technical and engineering skills and a professional engineering designation - (P.Eng) to work on exciting…
Added 5 hours ago
A
Senior Piping Supports Design Engineer
AtkinsRéalis
Mississauga, ON
- Full-time
…plans and executes the engineering activities assigned by the Technical Lead and/or Technical Manager, resolves routine and complex technical issues, and seeks guidance primarily for…
Added 5 hours ago
A
Senior Piping Stress Analyst Engineer
AtkinsRéalis
Mississauga, ON
- Full-time
…plans and executes the engineering activities assigned by the Technical Lead and/or Technical Manager, resolves routine and complex technical issues, and seeks guidance primarily for…

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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