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Added 1 min ago
C
Développeur(euse) Java sénior
CGI
Montreal, QC
- Full-time
CGI is seeking four Senior Java Developers to strengthen our consulting delivery teams in Montréal and Toronto. You will design, develop, modernize, integrate, and support enterprise grade…
Added 1 min ago
WI
Remediation Project Manager
WSP in Canada
Terrace, BC
- Full-time
…We have been providing contaminated site program management services to the worlds most technically focused companies for over 15 years. We consistently have backlog of 9 to 12 months and…
Added 1 min ago
ZC
Bilingual Sr Auto Claims Specialist
Zurich Canada
Toronto, ON
- Full-time
Zurich Canada is currently looking for a Senior Auto Claims Specialist to manage and resolve intermediate to complex commercial auto claims while delivering an outstanding customer…
Added 1 min ago
HC
Senior Platform Administrator (Salesforce) - ITS - FT Support
Humber College
Toronto, ON
- Full-time
Humber Digital Innovation, Information Technology Services provides leadership for the continuous development of digital experiences delivered on a secure, flexible, and dependable IT…
Added 1 min ago
WI
Senior Estimator
WSP in Canada
Brossard, QC
- Full-time
…Resources and Industry Project Controls team as a bilingual Senior Estimator. You will bring strategic cost insight to complex industrial, mining, oil and gas, and power generation projects…
Added 1 min ago
WI
Senior Estimator
WSP in Canada
Montreal, QC
- Full-time
…Resources and Industry Project Controls team as a bilingual Senior Estimator. You will bring strategic cost insight to complex industrial, mining, oil and gas, and power generation projects…
Added 1 min ago
CL
Facilities Management Senior Specialist - Canada(591283)
CEVA Logistics
Mississauga, ON
- Full-time
…freight forwarding, transportation and distribution management services. It offers supply chain support, along with logistics consultation, industry specific customization, global level…
Added 1 min ago
TB
Senior Web & Digital Designer
The BMI Group
Toronto, ON · Greater Toronto Area, Canada
- Full-time
BMI Group is a growing, diversified organization with interests spanning real estate investment and development, construction, environmental services, hospitality and emerging ventures.
Added 1 min ago
OI
Sales Representative (Home, Auto & Lifestyle) - 12-month contract
Orbit Insurance Services
Waterloo, ON
- Contract
Reporting to the Senior Manager, Sales for the Ontario Region, you will handle inbound calls from customers seeking quotes or looking to expand their coverage. Your role is to uncover…
Added 1 min ago
WI
Senior Estimator
WSP in Canada
Quebec, QC
- Full-time
…Resources and Industry Project Controls team as a bilingual Senior Estimator. You will bring strategic cost insight to complex industrial, mining, oil and gas, and power generation projects…
Added 1 min ago
I
Senior Integration Architect-SOA
IBM
Hamilton, ON
- $135,000 to $185,000 CAD / year
- Full-time
…culture of growth and empathy focuses on your long-term career development while valuing your unique skills and…
Added 1 min ago
IG
Certification Auditor
Insight Global
Guelph, ON
- Full-time
…design and reporting of operational efficiencies of controls to senior management. You are a key resource to the development of test plans and an expert in the configuration and operation…
Added 1 min ago
WI
Senior Estimator
WSP in Canada
Mississauga, ON
- Full-time
…Resources and Industry Project Controls team as a bilingual Senior Estimator. You will bring strategic cost insight to complex industrial, mining, oil and gas, and power generation projects…
Added 1 min ago
SI
Housekeeping - Suite Services Attendant
Shannex Incorporated
Halifax, NS
- Full-time
We are searching for a Suite Services Attendant / Housekeeper to join our Parkland at the Common team based in Halifax, Nova Scotia.
Added 1 min ago
CO
Senior Financial Analyst/ ERP Support Analyst (1 Year Contract)
City of Markham
Markham, ON
- $102,464 to $143,867 CAD / year
- Contract
Department and Commission: Finance Department, Corporate Services
Added 1 min ago
WI
Senior Estimator
WSP in Canada
Saskatoon, SK
- Full-time
…Resources and Industry Project Controls team as a bilingual Senior Estimator. You will bring strategic cost insight to complex industrial, mining, oil and gas, and power generation projects…
Added 1 min ago
I
Senior Integration Architect-SOA
IBM
Bedford, NS
- $135,000 to $185,000 CAD / year
- Full-time
…culture of growth and empathy focuses on your long-term career development while valuing your unique skills and…
Added 1 min ago
WI
Civil Engineer-in-Training
WSP in Canada
Kamloops, BC
- Full-time
…sanitary sewers, stormwater management facilities, and land development projects. This role offers a balance of technical design and field review responsibilities, providing valuable…
Added 1 min ago
T
Manager, IT Operation Security Remediation
TransLink
Vancouver, BC
- $109,920 to $164,880 CAD / year
- Full-time
Lead and responsible for Infrastructure, Operations, Network, Cloud Services, and the remediation of security vulnerabilities to deliver reliable, enterprise-wide technology solutions and…
Added 1 min ago
I
Senior Integration Architect-SOA
IBM
Vaughan, ON
- $135,000 to $185,000 CAD / year
- Full-time
…culture of growth and empathy focuses on your long-term career development while valuing your unique skills and…
Added 1 min ago
R
Human Resources Manager (English Services) (People & Culture)
Radio-Canada
Toronto, ON
- Full-time
Reporting to the Senior Director, Human Resources (English Services / News), you will serve as a key member of the leadership team for CBC News Ontario. Your deep expertise and broad…
Added 1 min ago
WI
Senior Estimator
WSP in Canada
Vancouver, BC
- Full-time
…Resources and Industry Project Controls team as a bilingual Senior Estimator. You will bring strategic cost insight to complex industrial, mining, oil and gas, and power generation projects…
Added 1 min ago
MV
*Senior Project Engineer
Metro Vancouver
Burnaby, BC
- Full-time
Our Water Services Department is seeking a *Senior Project Engineer who will be responsible for providing controls and automation programming, technical support, electrical and…
Added 1 min ago
NS
Pega Technical Architect
N2P Systems
Mississauga, ON
- Full-time
8+ years of Banking/Financial Services experience.
Added 1 min ago
ZC
Senior Claims Specialist, Liability
Zurich Canada
Montreal, QC
- Full-time
Zurich Canada is currently looking for a Senior Claims Specialist, Liability to deliver pragmatic and efficient claims management for moderate to complex liability claims, serving large…

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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