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Added 18 mins ago
SS
Application Support Engineer – SWIFT & Mainframe, Assistant Vice President
State Street
Toronto, ON
- Full-time
The Mainframe & SWIFT Application Support Specialist is responsible for the end-to-end support, monitoring, and incident management of our Mainframe accounting processes and SWIFT messaging…
Added 18 mins ago
SS
Application Support Engineer – SWIFT & Mainframe, Assistant Vice President
State Street
Toronto, ON
- Full-time
The Mainframe & SWIFT Application Support Specialist is responsible for the end-to-end support, monitoring, and incident management of our Mainframe accounting processes and SWIFT messaging…
Added 33 mins ago
Principal Software Engineer
Questrade Financial Group
Toronto, ON
We’re looking for our next Principal Software Engineer. Could It Be You?
Added 1 hour ago
L
Murex DevOps
Luxoft
Toronto, ON
- Full-time
You will play a key role in CI/CD implementation, infrastructure automation, environment management, and production reliability, working closely with development, QA, and client-facing…
Added 1 hour ago
P
JAMS Platform Engineer
ProwessSoft
Toronto, ON
- Contract
Engineer and administer JAMS Scheduler| including Scheduler| Agents| Executors| queues| resources and job configuration. Improve platform reliability| performance| capacity| resilience and…
Added 1 hour ago
GD
Software Engineering Developer, DevOps
General Dynamics Missions System International
Calgary, AB · Ottawa, Ontario
- $85,000 to $110,000 CAD / year
- Full-time
We are seeking a skilled DevOps Engineer to join our team and enhance our development and operational efficiency. This role is ideal for someone who thrives in a cloud-agnostic environment…
Added 2 hours ago
EI
Systems Engineer – Industrial Control and Communications Systems
Egis in Canada
Toronto, ON
- $120,000 to $150,000 CAD / year
- Full-time
Systems Engineer – Industrial Control and Communications Systems based in Toronto, Ontario, Canada. The role is responsible for the design, integration, commissioning, operation, and…
Added 2 hours ago
Intermediate Site Reliability Engineer
ContactMonkey
Toronto, ON
…review. There's room to develop deeper expertise in reliability, infrastructure automation, and application…
Added 2 hours ago
M
Data Specialist
McKesson
Mississauga, ON
- Full-time
Familiarity with automated testing, deployment automation, and infrastructure best practices
Added 3 hours 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 3 hours ago
HP
Sr Manager, Business Analytics
Hill's Pet Nutrition
Toronto, ON
- $143,100 to $166,950 CAD / year
- Full-time
…leadership to Canadian Data Analyst and Business Intelligence…
Added 3 hours ago
L
Senior Analytics Engineer
Lime
Remote, Canada
- $100,000 to $138,000 CAD / year
- Full-time
- Remote
Evaluate and integrate orchestration & automation capabilities that reduce manual intervention and operational risk across ingestion → transformation → reporting pipelines (including…
Added 3 hours ago
EG
Systems Engineer – Industrial Control and Communications Systems
Egis Group
Toronto, ON
- $120,000 to $150,000 CAD / year
- Full-time
Systems Engineer – Industrial Control and Communications Systems based in Toronto, Ontario, Canada. The role is responsible for the design, integration, commissioning, operation, and…
Added 3 hours ago
O
Sr. Engineer Network Administration
OnX
Toronto, ON
- Full-time
We are seeking a highly skilled Senior Engineer - Network Administration to join our Infrastructure Management team. In this role, you will be responsible for designing, administering,…
Added 3 hours ago
O
Sr. Engineer System administrator
OnX
Toronto, ON
- Full-time
Infrastructure Monitoring and Troubleshooting
Added 3 hours ago
S
Senior Application Support Engineer (m/f/d)
Solactive
Toronto, ON
- Full-time
Improve monitoring, automation, operational processes, and support workflows.
Added 4 hours ago
TC
GCP Infrastructure & Cloud SRE Engineer
Tata Consultancy Services
Toronto, ON
- $90,000 to $100,000 CAD / year
- Full-time
…clients to transform themselves across the full AI stack, from infrastructure to…
Added 4 hours ago
DevOps Developer, AI Automation
Stay22
Montreal, QC
We are searching for a Platform Engineer with strong Devops and SRE experience to join our growing Platform team. You will also drive the adoption of agentic AI across the platform,…
Added 4 hours ago
Développeur(-euse) logiciel – Intégration / Backfill Integration Developer – Canada (Montreal)
mthree Recruiting Portal
Montreal, QC
Comment discuter de l'activité de soutien à la production à un niveau élevé, y compris ITIL (bibliothèque d'infrastructure des technologies de l'information), la surveillance, DevOps, SRE…
Added 4 hours ago
I
Senior System Administrator
ICES
Toronto, ON
- Contract
Work with documentation and monitoring tools to maintain accurate records of system configurations and changes. This ensures that all technical support aligns with organizational goals and…
Added 4 hours ago
AI
Production Support Engineer
Aptino, Inc.
Toronto, ON
- $45 to $50 CAD / hour
- Contract
We are looking for an experienced Application/Production Support Engineer to provide L2/L3 production support for enterprise applications supporting Global Investment Banking and Capital…
Added 4 hours ago
MF
Cloud Platform Engineer
MTY Food Group
Montreal, QC
- Full-time
We are seeking a skilled and proactive Cloud Platform Engineer to manage, monitor, and optimize our Amazon Web Services (AWS) and Google Cloud Platform (GCP) environments. This role will be…
Added 4 hours ago
IC
Senior System Administrator
ICES Central
Toronto, ON
- Full-time
- Temporary
Work with documentation and monitoring tools to maintain accurate records of system configurations and changes. This ensures that all technical support aligns with organizational goals and…
Added 4 hours ago
E
IP Network Engineer
ELITS
Mississauga, ON
- Full-time
…modelling, performance analysis, network optimization, telemetry, monitoring tools, Python scripting, Ansible, and configuration…
Added 8 hours ago
Software Developer III, Ads Infrastructure
Google
Waterloo, ON
2 years of experience with developing large-scale infrastructure, distributed systems or networks, or experience with compute technologies, storage or hardware architecture.

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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