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Added 18 mins ago
WR
Manager, Stewardship & Impact
Waterloo Regional Health Network Foundation (WRHNF)
Kitchener, ON
- $73,950 to $86,700 CAD / year
- Full-time
Establish, track, and evaluate stewardship performance metrics, leveraging insights on donor renewal, upgrade rates, and engagement to drive continuous strategy enhancement.
Added 18 mins ago
WI
Senior Project Management - Land Development
WSP in Canada
ON · Ontario, Canada
- Full-time
Are you a visionary leader driven to deliver complex projects and help shape thriving communities? As a Senior Project Manager – Land Development & Municipal Engineering, you will lead…
Added 18 mins ago
WI
Senior Project Engineer - Land Development
WSP in Canada
ON · Ontario, Canada
- Full-time
Lead transformative land development projects that help shape growing communities. As a Senior Project Engineer, Land Development, you will combine technical excellence, project leadership,…
Added 18 mins ago
SG
Senior Product Solutions Analyst
Scotia Global Asset Management
Toronto, ON
- Full-time
The Senior Product Solutions Analyst will play a key role in transforming how business teams across Scotia Global Asset Management (SGAM) operate by introducing AI-powered technologies and…
Added 18 mins ago
WI
Electrical Engineer - Transportation & Buildings
WSP in Canada
Toronto, ON
- Full-time
Your impact starts here. As an Electrical Engineer with WSP, you will contribute to complex transportation and building projects that support safe, reliable, and sustainable land, air, and…
Added 18 mins ago
WI
Electrical Engineer - Transportation & Buildings
WSP in Canada
Markham, ON
- Full-time
Your impact starts here. As an Electrical Engineer with WSP, you will contribute to complex transportation and building projects that support safe, reliable, and sustainable land, air, and…
Added 18 mins ago
RM
Manager, Mechanical
Rocky Mountaineer
Kamloops, BC
- Full-time
Reporting to the Senior Manager, Mechanical Operations, the Manager, Mechanical is responsible for the safe, reliable, and efficient operation of Rocky Mountaineer’s West Coast rail fleet.…
Added 18 mins ago
WI
Electrical Engineer - Transportation & Buildings
WSP in Canada
Vaughan, ON
- Full-time
Your impact starts here. As an Electrical Engineer with WSP, you will contribute to complex transportation and building projects that support safe, reliable, and sustainable land, air, and…
Added 21 mins ago
E
Software Engineer/Senior Software Engineer (Full Stack)
Envisio
Remote, Canada
- $90,000 to $110,000 CAD / year
- Full-time
- Remote
Envisio Solutions is a leading provider of strategic planning and performance management software, helping organizations turn their visions into reality. We empower leaders to execute their…
Added 21 mins ago
T
Information Security Analyst (Detection Engineer)
TD
Toronto, ON
- Full-time
We are seeking a Senior Information Security Analyst to support enterprise cybersecurity monitoring, detection engineering, and security operations improvement. This role will help develop…
Added 21 mins ago
C
Infrastructure DevOps Analyst
Citi
Mississauga, ON
- Full-time
We are seeking a highly skilled and experienced Senior DevOps Engineer with a strong focus on Python development to join our dynamic Technology team. In this intermediate-level position,…
Added 21 mins ago
J
Senior Test Development Engineer
Jabil
Ottawa, ON · CAN - Ottawa
- Full-time
Jabil is looking for an experienced Senior Test Development Engineer to join our company in Ottawa, Canada.
Added 21 mins ago
PC
Maintenance & Facilities Manager, Columbia Icefield
Pursuit Collection
Jasper, AB · CAN - Columbia Icefield
- Full-time
Develop budgets with senior leadership, forecast expenses
Added 37 mins ago
CI
Principal Engineer, Risk and TFM Technologies
CPP Investments | Investissements RPC
Toronto, ON
- Full-time
As Principal Engineer, Risk & Total Fund Management Technology, you will define architectural direction and elevate engineering excellence across critical investment technology platforms…
Added 37 mins ago
Principal Offensive Security
Varicent
Toronto, ON
We're looking for a Principal Offensive Security engineer to be the senior technical authority for our offensive security practice across applications, cloud environments, enterprise…
Added 37 mins ago
TT
Structural Vibration Engineer
Thornton Tomasetti
Mississauga, ON
- Full-time
Thornton Tomasetti is seeking a Senior Engineer to join our Mississauga-based Acoustics, Noise & Vibration team. This role is primarily focused on structural vibration assessment, design,…
Added 48 mins ago
HS
Senior Integration Engineer (Boomi/Workato)
HeartCentrix Solutions
ON · Ontario, Canada
- Contract
We are seeking a Senior Integration Engineer with deep expertise in Boomi and Workato, specializing in payroll and HR system integrations. This role will focus on designing, developing, and…
Added 48 mins ago
BS
Application Delivery Network Engineer
Brainhunter Systems Ltd
Canada
- Contract
Job-Role/Title: Senior Network Migration & Application Connectivity Engineer (Technology Transformation Program - Applications Network Engineer)
Added 48 mins ago
OS
Senior Forward Deployed Engineer (FDE)
Open Systems Technologies
Toronto, ON
- Contract
We are looking for Senior Forward Deployed Engineer - Spread Products (Financing & Securitization). These are Hybrid contract to Hire roles in Toronto,DT. If you have the relevant skills…
Added 50 mins ago
EG
Geologist III
Equinox Gold Corp.
Geraldton, ON
- Full-time
Lead the day-to-day activities of the Mine Geology team, providing technical direction, mentorship, coaching, performance feedback, training, workforce planning, scheduling, and ensuring…
Added 50 mins ago
P
Solution Architect / Lead EBO Engineer – BAS (SABAS003)
Potenco
Toronto, ON · Greater Toronto Area, Canada
- Full-time
Our Client is seeking an experienced Solution Architect / Lead EBO Engineer to serve as the senior technical authority for a complex Building Automation System modernization and migration…
Added 50 mins ago
T
Senior Quality Engineer
TEEMA
Toronto, ON
- Contract
We’re looking for a Senior Quality Engineer with strong experience in data quality, QA automation, and enterprise data platforms.
Added 50 mins ago
E
Senior Electrical Design Engineer
ERMCO-ECI
Mississauga, ON
- Full-time
Your mandate as Senior Electrical Design Engineer is a high-level position responsible for the design, development, and optimization of transformers. As an experienced engineer, the holder…
Added 52 mins ago
TC
Building Science Engineer
Trace Consulting Group
Vaughan, ON
- Full-time
…professional and are seeking a position to work directly with senior management to advance your…
Added 52 mins ago
PX
Sr. Data Platform Engineer
Project X
Toronto, ON
- Full-time
We are seeking a Senior Data Platform Engineer for our enterprise client. This is a senior, hands-on role focused on modernizing and strengthening a data platform built around Snowflake,…

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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