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Added 2 mins ago
IL
Technical Customer Support 2
Intrado Life & Safety, Inc.
Montreal, QC · Saint-Laurent, Quebec
- Full-time
Deux ans d’expérience en concepts réseau, dépannage de systèmes IP et soutien de serveurs et postes Windows (requis).
Added 2 hours ago
RS
Electrical Controls Engineer
Redpath Sugar Ltd
Toronto, ON
- Full-time
Microsoft Windows and Server operating systems.
Added 3 hours ago
Infrastructure Engineer
HTS Engineering Ltd.
Toronto, ON
We are looking for an Infrastructure Engineer to join our specialized, tight-knit technical team. You will be responsible for implementing and supporting the server environments and…
Added 4 hours ago
P
JAMS Platform Engineer
ProwessSoft
Toronto, ON
- Contract
…engineering practices REST APIs and systems integration SQL Server and database troubleshooting Windows Server and distributed application troubleshooting Monitoring| telemetry and…
Added 4 hours ago
Electrical Controls Engineer
Florida Crystals / ASR Group
Toronto, ON
Microsoft Windows and Server operating systems.
Added 6 hours ago
LI
Data Center Engineer
LanceSoft, Inc.
Markham, ON
- $40 to $45 CAD / hour
- Contract
· Operating System Installation – Windows Server, Linux, Unix
Added 6 hours ago
I
Senior Systems Engineer
illumin
Toronto, ON · Greater Toronto Area, Canada
- $100,000 to $150,000 CAD / year
- Full-time
Serve as a senior technical escalation point for Linux systems and infrastructure issues, with strong working knowledge of Windows Server environments.
Added 7 hours ago
V
Windows Server Engineer
VySystems
Toronto, ON
- Full-time
5+ years of hands-on experience administering and supporting Microsoft Windows Server environments (Windows Server 2012 and newer).
Added 7 hours ago
O
Sr. Engineer System administrator
OnX
Toronto, ON
- Full-time
…enterprise environments and enjoys managing mission-critical server infrastructure across Windows, Linux, and cloud…
Added 8 hours ago
I
Senior System Administrator
ICES
Toronto, ON
- Contract
Perform day-to-day operational activities, including Linux server administration, RHEL patching and upgrades, backup and recovery, infrastructure maintenance, and data center operations by…
Added 8 hours ago
IC
Senior System Administrator
ICES Central
Toronto, ON
- Full-time
- Temporary
Perform day-to-day operational activities, including Linux server administration, RHEL patching and upgrades, backup and recovery, infrastructure maintenance, and data center operations by…
Added 19 hours ago
MT
Senior Azure engineer
Manx Telecom Enterprise
Permanent North American Gaeltacht, ON
- Full-time
Server Lifecycle Management: Oversee the provisioning, patching (via Azure Update Manager or WSUS), hardening, and troubleshooting of Windows Server environments (2019/2022/2025).
Added 19 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 19 hours ago
MT
Infrastructure Engineer
Manx Telecom Enterprise
Permanent North American Gaeltacht, ON
- Full-time
Solid grounding in Windows Server administration (2016/2019/2022) including basic troubleshooting, event log analysis, and service management
Added 1 day ago
I
Senior Systems Engineer
illumin
Toronto, ON · Greater Toronto Area, Canada
- Full-time
Serve as a senior technical escalation point for Linux systems and infrastructure issues, with strong working knowledge of Windows Server environments.
Added 1 day ago
Q-
MONTREAL [HYBRIDE] - SME Dynatrace - Monitoring & Observability
QUANTEAM - North America (RAINBOW PARTNERS Group)
Montreal, QC · Greater Montreal Metropolitan Area
- Full-time
The technical engineer has broad responsibilities for the deployment of related processes and services. This includes:
Added 1 day ago
CI
Senior Microsoft 365 & Unified Communications Engineer
Compugen Inc
Surrey, BC
- Full-time
Management and Operational Support of Exchange Virtual Server’s and DAG (Database Availability Group). This includes monthly OS Patches and Quarterly CU or SU Application patches. And…
Added 1 day ago
QT
Site Reliability Engineer
Q1 Technologies, Inc.
Toronto, ON
- $95,000 to $115,000 CAD / year
- Full-time
1+ years of Windows Server administration experience.
Added 1 day ago
ET
DevOps Engineer/SRE
Envision Technology Solutions
Toronto, ON
- Contract
…engineering practices REST APIs and systems integration SQL Server and database troubleshooting Windows Server and distributed application troubleshooting Monitoring| telemetry and…
Added 1 day ago
M
Cloud & AI Solution Engineer
Microsoft
Toronto, ON
- Full-time
You bring deep expertise in migrating core workloads - including Windows, SQL Server, Linux, PostgreSQL, and Oracle - to Azure. Beyond migration, you lead customers through modernization…
Added 1 day ago
IC
Cloud Infrastructure & DevSecOps Engineer
InfoTrack Canada
Toronto, ON
- Full-time
Strong experience automating Windows and Linux server management on cloud infrastructure - manual server upkeep isn't how you operate.
Added 1 day ago
HW & SW Applications Admin 1
Celestica International LP
Toronto, ON
License Server Operations: Administer and monitor central concurrent-user license managers, handling license queuing configurations and multi-tenant tracking utilities.
Added 2 days ago
C
HW & SW Applications Admin 1
Celestica
Toronto, ON
- Full-time
License Server Operations: Administer and monitor central concurrent-user license managers, handling license queuing configurations and multi-tenant tracking utilities.
Added 2 days ago
QW
SRE/ Platform Engineer
Quantum World Technologies Inc.
ON · Ontario, Canada
- Contract
…engineering practices REST APIs and systems integration SQL Server and database troubleshooting Windows Server and distributed application troubleshooting Monitoring| telemetry and…
Added 2 days ago
O
Sr. Engineer System administrator
OnX
Toronto, ON
- Full-time
…enterprise environments and enjoys managing mission-critical server infrastructure across Windows, Linux, and cloud…

OnX

Sr. Engineer System administrator

Toronto, ON, Canada

Full-time

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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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