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Added 3 mins ago
PT
Office administrator
Prime Truck Centre Limited
Edmonton, AB
- From $37.75 CAD / hour
- Full-time
- On-site
Added 6 mins ago
B
Building Technician IV- Electrician
BGIS
Red Deer, AB
- Full-time
Building Systems Maintenance Certificate (SMC) Systems Maintenance Administrator (SMA) Systems Maintenance Technician (SMT)
Added 6 mins ago
PC
Customer Care Administrator
PERI Canada
Bolton, ON
- Full-time
We are looking for a passionate and detail-oriented Customer Care Administrator to join our team. In this role, manage the order to cash process, which includes transferring information…
Added 6 mins ago
CP
Accounts Receivable Administrator
Colliers Project Leaders | Canada
Mississauga, ON
- $50,000 to $53,000 CAD / year
- Full-time
Added 6 mins ago
B
Facility Manager III
BGIS
Vancouver, BC
- Full-time
Added 6 mins ago
G
Student Finance Coordinator - Services
Graham
Calgary, AB
- Temporary
…supporting the Services division. Reporting to the Job Cost Administrator Manager, the Co-op Student Finance Coordinator plays a key role in supporting transaction processing activities…
Added 6 mins ago
B
Facility Manager III - Future Opportunities
BGIS
Vancouver, BC
- Full-time
Added 7 mins ago
Dental Administrator
Passion Dental Group Inc.
Calgary, AB
We're looking for a Dental Administrator who enjoys helping others, staying organized, and creating a positive experience for every patient who walks through our doors.
Added 7 mins ago
Dental Administrator
Passion Dental Group Inc.
Georgetown, ON
Thank you for considering the Dental Administrator role at Halton Village. We're hiring a full-time Dental Administrator for our unique practice, which operates differently from a typical…
Added 21 mins ago
CP
Accounts Receivable Administrator
Colliers Project Leaders | Canada
Ottawa, ON
- $50,000 to $53,000 CAD / year
- Full-time
Added 22 mins ago
PC
Program Manager- Adults Services
Pacific Coast Community Resources
Kelowna, BC
- Temporary
A degree in one of the humanities, social sciences or related field with educational preparation for the role of manager/administrator
Added 22 mins ago
BH
Resident Services Assistant (Casual)
Baptist Housing Seniors Living
Victoria, BC
- $26.53 CAD / hour
- Part-time
Assist the Administrator with projects, participate in team meetings, and support resident events
Added 25 mins ago
MD
Office administrator
MARCHÉ D'ALIMENTATION COREEN MTL
Montréal, QC
- $34.62 to $36 CAD / hour
- Full-time
- On-site
Added 36 mins ago
LL
Clerk, Finance - AP (Permanent Full-Time)
Lac La Biche County
Lac la Biche, AB
- Full-time
Assist Payroll Administrator with payroll processing duties on an as needed basis.
Added 37 mins ago
PW
Rentals Administrator
Precision Well Servicing
Cold Lake, AB
- Full-time
Precision Well Servicing is currently seeking a motivated and detailed-oriented Rentals Administrator to join our team in Cold Lake.
Added 37 mins ago
JC
Project Analysis Administrator
Johnson Controls
Nisku, AB
- Full-time
The Project Analysis Administrator is responsible for supporting the project analysis department through reporting, forecasting, cost analysis, ERP administration, audit support, and…
Added 37 mins ago
A
IT Administrator
AlgaeCal
Remote, Canada
- Full-time
- Remote
AlgaeCal is on the hunt for an IT Administrator who’s ready to roll up their sleeves and keep our tech systems running smoothly.
Added 37 mins ago
AW
Reconciliations Administrator, Temporary
Aviso Wealth
Remote, Canada
- $46,000 to $55,000 CAD / year
- Temporary
- Remote
We’re looking to fill an opening for a Reconciliations Administrator to join our Operations team for 12 months.
Added 37 mins ago
AW
Reconciliations Administrator, Temporary
Aviso Wealth
Remote, Canada
- $46,000 to $55,000 CAD / year
- Temporary
- Remote
We’re looking to fill an opening for a Reconciliations Administrator to join our Operations team for 12 months.
Added 1 hour ago
SP
Customer Success Manager - Global Public Sector
Salesforce Partner Canada
Toronto, ON
- Full-time
Added 1 hour ago
KR
Desktop & End User Computing (EUC) Administrator
KTek Resourcing
Montreal, QC
- Contract
Added 1 hour ago
A
Reconciliations Administrator, Temporary
Aviso
Toronto, ON
- $46,000 to $55,000 CAD / year
- Temporary
We're looking to fill an opening for a Reconciliations Administrator to join our Operations team for 12 months.
Added 1 hour ago
S
Customer Success Manager - Global Public Sector
Salesforce
Toronto, ON · Canada - Toronto
- Full-time
Added 1 hour ago
Civil Project Engineer, Municipal
ISL Engineering & Landservices
Victoria, BC
Added 1 hour ago
T
Oracle / PostgreSQL Database Administrator
TD
Mississauga, ON · Toronto, ON
- Full-time
The Oracle/PostgreSQL Database Administrator is responsible for the administration, reliability, security, recoverability, and performance of mission-critical database platforms supporting…

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.

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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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