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Added 10 mins ago
Associate or Associate Director, Technical Investment Banking - Energy - Calgary, AB
Scotiabank
AB · Calgary, AB
Associate or Associate Director, Technical Investment Banking – Energy – Calgary, AB
Added 24 mins ago
SC
Environmental Risk Assessor
SLR Consulting
Guelph, ON · Toronto, ON · Ottawa, ON
- Full-time
…closely with internal teams, clients, and regulators to develop technical scopes of work, prepare proposals, and support the successful management and delivery of…
Added 38 mins ago
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Intermediate Electrical Engineer
Juno Engineering Canada Inc.
Calgary, AB
- Full-time
Provide technical support during installation, commissioning, and start-up phases.
Added 38 mins ago
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Senior Instrumentation Engineer
Juno Engineering Canada Inc.
Calgary, AB
- Full-time
…foster a collaborative, forward-thinking culture where your technical leadership and design expertise can shape the next generation of industrial…
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Intermediate Electrical Substation Engineer
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Calgary, AB
- Full-time
Support cost estimating, technical bid evaluations, vendor-document review, technical recommendations, and factory acceptance testing.
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Senior Electrical Designer
Juno Engineering Canada Inc.
Calgary, AB
- Full-time
…Canada. We are currently seeking a Senior Electrical Designer to support the development, coordination, and quality of E&I drawing deliverables produced by our internal design and drafting…
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Senior Expeditor
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AB · Edmonton, AB
- Full-time
…fabrication, modularization, field installation, and professional support services for some of world's most challenging heavy-oil facilities, gas plants, power-stations, renewable energy,…
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External Audit, Senior Associate
PwC Canada
Winnipeg, MB
- Full-time
Support the development of the audit approach and complete planning procedures
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Juno Engineering Canada Inc.
Calgary, AB
- Full-time
Supervise and mentor junior engineers and electrical designers, providing technical guidance and ensuring the accuracy of in-house engineering work.
Added 1 hour ago
AE
Electrical Engineer
Associated Engineering
Calgary, AB
- Full-time
As an electrical engineer you will also be involved in the supervising of junior engineers or technicians, project planning and the review of subordinates’ work for technical accuracy.
Added 1 hour ago
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Junior Electrical Technologist
Associated Engineering
Calgary, AB
- Full-time
Associated Engineering, a proudly Canadian, Employee-owned Company is seeking a Junior Electrical Technologist in our Calgary office. In this position, you will work with engineers,…
Added 1 hour ago
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Senior Bridge Engineer
Associated Engineering
Calgary, AB
- Full-time
…this role you will be responsible for carrying out detailed technical work and leading design teams while managing projects within the defined budget, and quality requirements. The…
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Journeyperson Electrician
Cynet Systems
Nisku, AB
- $41 to $44 CAD / hour
- Contract
Train, direct, and support junior employees and apprentices, and inspect and certify work quality as required.
Added 1 hour ago
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Junior Purchaser
STEP Energy Services
Red Deer, AB
- Full-time
Coordinate closely with the Finance and Accounts Payable teams to support timely and accurate invoice reconciliation, including resolving discrepancies and ensuring proper documentation is…
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Senior Accountant
Inspired HR
Calgary, AB
- Full-time
Provide guidance and support to junior accounting staff in the completion of day-to-day accounting activities.
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NKBA Big Sky Chapter
Toronto, ON
- Full-time
Junior Interior Designer at Easy Home Renovations Inc.
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Senior Accountant
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Calgary, AB
- $95,000 to $115,000 CAD / year
- Full-time
Provide guidance and support to junior accounting staff in the completion of day-to-day accounting activities.
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Architecte de la sécurité SAP / SAP Security Architect
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Thornhill, ON
Ce rôle fait partie du groupe Global Technical Competency et jouera un rôle important dans le renforcement des capacités de sécurité SAP au sein de Syntax. À ce titre, l’Architecte…
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Junior Finance Controller
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Mississauga, ON
- $95,000 to $100,000 CAD / year
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An established organization is looking for a Junior Finance Controller to join its finance team. This is an excellent opportunity for an accounting professional who wants to move beyond…
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Sr Principal Developer
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Montreal, QC · Greater Montreal Metropolitan Area
- Full-time
…many ways - from a rich set of career development programs to support of community service projects to social events that foster fun and relationship building across our global…
Added 2 hours ago
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Technical Support Analyst / Analyste du soutien technique
Parkland Corporation
Calgary, AB
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Added 2 hours ago
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Technical Support Analyst / Analyste du soutien technique
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Montreal, QC
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Added 2 hours ago
BS
Tech Transformation - Application Network Engineer
Brainhunter Systems Ltd
Toronto, ON
- Contract
The role combines deep technical expertise in enterprise networking with strong consulting, troubleshooting, and stakeholder management skills. The successful candidate will provide…
Added 2 hours ago
V
UX Researcher
Vasco
Remote, Canada
- Full-time
- Remote
…confidence all the time. We structure CRM, billing, calls, and support data into a semantic layer where every metric is sourced, every definition is locked, and every answer is…
Added 2 hours ago
V
Product Manager
Vasco
Remote, Canada
- Full-time
- Remote
…confidence all the time. We structure CRM, billing, calls, and support data into a semantic layer where every metric is sourced, every definition is locked, and every answer is…

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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