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Added 3 mins ago
C
Java Angular Full Stack Developer
Citi
Mississauga, ON
- Full-time
Build and maintain scalable RESTful APIs following enterprise API standards, ensuring proper versioning, error handling, pagination, and security controls across lending platforms
Added 3 mins ago
CT
Business Analyst, Real Estate and Construction Data
Canadian Tire Corporation
Toronto, ON
- $68,000 to $75,000 CAD / year
- Full-time
…forecast drivers, variances, risks, and assumptions; maintaining system access, roles, workflows, configurations, and data integrity; coordinating the onboarding and ongoing support of…
Added 3 mins ago
SI
Cloud Solutions Architect
STACK IT Recruitment
Remote, Canada
- Full-time
- Remote
A clear technical communicator who turns requirements into designs an engineering team can build
Added 18 mins ago
Senior Software Developer, Mobile (iOS), Platforms and Devices
Google
Waterloo, ON
…including information retrieval, distributed computing, large-scale system design, networking and data storage, security, artificial intelligence, natural language processing, UI design and…
Added 18 mins ago
E
Automation Specialist
Ecolab
Calgary, AB · CAN-Calgary Office Liquid Lab
- Full-time
…programming, and industrial control systems. Working closely with Engineering, Production, and Maintenance teams, the Automation Specialist supports both new equipment integration and…
Added 18 mins ago
E
Staff Eng, API Design & Governance
eBay
Toronto, ON
- Full-time
eBay’s Developer Ecosystem team builds the tools, platforms, and experiences that help developers create solutions that make buying and selling on eBay faster and easier. The team owns…
Added 32 mins ago
LW
Sales Engineer
Linkwave Wireless Solutions
Toronto, ON · Greater Toronto Area, Canada
- Full-time
DAS System training/certification for any of the DAS OEM platforms, e.g.: ADRF, BTI, SOLiD, CommScope
Added 32 mins ago
UM
Senior Software Tester
Ultra Maritime
Dartmouth, NS
- Full-time
…From surface vessels to sub-surface operations and unmanned platforms, we are revolutionizing the way naval missions are…
Added 33 mins ago
Software Engineer I
RAM Engineering Ltd.
Vancouver, BC
…complex and impactful infrastructure projects. We specialize in engineering, project and construction management, and project support services across the marine, transportation, utilities,…
Added 33 mins ago
FA
Full Stack Developer (AI-Native)
Forum Asset Management
Toronto, ON
- Full-time
With over $4 billion in AUM, Forum is one of Canada's most dynamic investment platforms. In 2024, we completed the country’s largest real estate transaction through our acquisition of…
Added 33 mins ago
W
Talent Acquisition Specialist
Wagepoint
Remote, Canada
- $75,000 to $85,000 CAD / year
- Temporary
- Remote
Proven experience recruiting across a mix of technical (e.g., engineering, product, data) and non-technical (e.g., sales, customer success, G&A) roles, with enough technical awareness to…
Added 1 hour ago
D
Consultant
Deloitte
Toronto, ON
- Full-time
Has a bachelor's or master’s degree in supply chain management, Information Systems, Human Resources, Finance, Accounting, Business Administration, Engineering, or a related field.
Added 1 hour ago
AC
Software Engineer (.NET / C# and AI/IoT)
Artelia Canada
Montreal, QC
- Full-time
Maintain and enhance real-time data transmission systems and communication protocols for equipment used in Real-Time Location System (RTLS) solutions;
Added 1 hour ago
VC
Product Growth Marketing Manager, Lifecycle & GTM Systems
Valsoft Corporation
Remote, Canada
- Full-time
- Remote
Manage the CRM as the system of record for marketing and lifecycle: data model, custom properties, lifecycle stages, lead status, lists and segments, forms, and workflow automation.
Added 1 hour ago
M
Senior Full Stack Engineer, Customer & Cardholder Experiences
Marqeta
Remote, Canada
- Full-time
- Remote
Have significant ownership of a component/feature of the system.
Added 1 hour ago
PA
Protech Mobile Installation Field Trainer
Protech Automotive Solutions
Burlington, ON
- Full-time
Deliver re-certification and refresher training as hardware, vehicle platforms, and installation procedures change.
Added 1 hour ago
SO
Financial Controller
Salas O'Brien
Toronto, ON · Greater Toronto Area, Canada
- Full-time
Founded in 1975, Salas O’Brien is an employee-owned engineering and professional services firm focused on achieving impact for our clients, our team, and the world. We know that tomorrow’s…
Added 1 hour ago
SO
Software Support Specialist
Software of Excellence
Surrey, BC
- Full-time
…patients. In fact, one connected electronic health record (EHR) system simplifies each step of the patient experience - from first contact and scheduling to clinical treatment and billing,…
Added 1 hour ago
PD
Senior Software Engineer - Backend
Parallel Domain
Vancouver, BC
- Full-time
Parallel Domain builds synthetic data and simulation platforms for autonomous vehicle and robotics teams. The Product Engineering team owns the customer-facing product and service layer:…
Added 1 hour ago
SL
Associate Software Engineer
Sun Life
Toronto, ON · Waterloo, ON · Sun Life Toronto One York
- Full-time
Join the Platforms and Engineering group and help shape the future of Sun Life's technology. We're looking for a talented Associate Software Engineer- .NET to own meaningful projects that…
Added 1 hour ago
C
Backend Java Developer, Vice President
Citi
Mississauga, ON
- Full-time
…globally distributed team of talented individuals, creating platforms/products that aims to deliver innovative solutions to bankers and clients by applying latest engineering standards,…
Added 1 hour ago
C
Consultant, Java Back End Developer
CIBC
Toronto, ON
- Full-time
…back-end application development, systems integration, and modern engineering practices, while helping deliver scalable solutions on current and emerging platforms. In this role, you'll…
Added 1 hour ago
RS
Director, Customer Success Operations & Education
Redwood Software
Toronto, ON
- $150,000 to $170,000 CAD / year
Partner with Product and Engineering to connect customer feedback, adoption data, and learning needs to product-roadmap decisions.
Added 1 hour ago
HA
Financial Controller
Haag, a Salas O'Brien Company
Toronto, ON
- Full-time
Founded in 1975, Salas O’Brien is an employee-owned engineering and professional services firm focused on achieving impact for our clients, our team, and the world. We know that tomorrow’s…
Added 2 hours ago
HR
Technical Specialist, Senior - Vital Software
Hitachi Rail
Toronto, ON
- Full-time
…software solutions, drive architectural consistency, and support system performance, safety, and reliability objectives. Working under the direction of the Chief Software Architect, the…

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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