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Added 6 mins ago
L
Senior Forward Deployment Engineer
Luxoft
Mississauga, ON
- Full-time
The role combines senior software engineering, DevOps, SRE, test automation, application security, and legacy modernization. Approximately 70% of the work involves hands-on coding and…
Added 37 mins ago
E
Senior Thermal Mechanical Engineer
Ecolab
Calgary, AB · CAN-Calgary Office Quarry Park
- Full-time
…high-performance computing, and next-generation data centers? As a Senior Thermal Mechanical Engineer, you will lead the development of innovative thermal management solutions, drive…
Added 1 hour ago
BM
Commissioning Manager - Ontario
Barton Malow
Cambridge, ON
- Full-time
REPORTS TO: Project Manager / Senior Project Manager
Added 1 hour ago
WH
Senior Automation Engineer
Waterstone Human capital
Toronto, ON
- Full-time
Every project here is custom, there's no off-the-shelf system to plug in and go. As Senior Automation Engineer, you'll write PLC programs from scratch for large, one-of-a-kind machines,…
Added 1 hour ago
C
Intermediate-Senior Electrical Engineer
Cheme
Toronto, ON · Greater Toronto Area, Canada
- Full-time
…solid working knowledge in one or more technical areas. The Engineer will be responsible for the implementation of best practices and delivering technical excellence in project…
Added 1 hour ago
Jr Instrumentation & Controls EIT
North American Rail Solutions
Calgary, AB
Field instrumentation and control system design and control strategy development under the supervision of senior engineers.
Added 1 hour ago
B
Technical Specialist II
BMO
Toronto, ON · SCC
- Full-time
We are looking for a highly skilled DevOps/Site Reliability Engineer (SRE) to join one of our high-performing, mission-critical technology teams. This role offers the opportunity to work on…
Added 1 hour ago
A
Senior Machine Learning Engineer
Autodesk
Toronto, ON · AMER - Canada - Ontario - Toronto - University Ave
- Full-time
We are looking for an exceptional Machine Learning Engineer to design, build, operationalize, and scale production-grade AI/ML and Agentic AI systems at Autodesk For Go-to-market…
Added 1 hour ago
CI
Senior Microsoft 365 & Unified Communications Engineer
Compugen Inc
Surrey, BC
- Full-time
Position Overview: Compugen is currently recruiting for a Senior Unified Communications Specialist role. Flexibility to work full-time shifts, including weekends and evenings is required.…
Added 1 hour ago
D
Senior Product Engineer II - Backend
Docebo
Toronto, ON
- $123,400 to $164,500 CAD / year
- Full-time
As a Senior Product Engineer II, you bring deep expertise in backend engineering alongside strong working competency across the broader stack. You own complex features and technical…
Added 1 hour ago
H
Senior Mechanical Engineer
HDR
Calgary, AB
- Full-time
Reporting to the Mechanical Section Manager, the Senior Mechanical Engineer is a member of the integrated project team that contributes Mechanical engineering knowledge and analysis during…
Added 1 hour ago
Digital Engineer
Alstom
Saint-Bruno, QC
Progress towards senior roles in system integration or project management
Added 1 hour ago
KC
Senior Embedded Software Designer
Kepler Communications Inc.
Toronto, ON
- Full-time
We're on the hunt for a top-tier Senior Embedded Software Engineer. Your focus will be on software development and maintenance required for both space and ground-based assets for a growing…
Added 1 hour ago
C
RCCA Lead -Root Cause Corrective Action Lead
Cyient
Longueuil, QC
- Full-time
…sessions • Deep dive into manufacturing process and quality system failures to identify systemic causes of delivery delay • Develop and maintain the priority framework ensuring alignment…
Added 2 hours ago
Platform Engineer - AI Engineering
DRW
Montreal, QC
We are looking for a Platform Engineer to help build and operationalize our AI tooling ecosystem. Working closely with the Team Lead and Senior/Staff SWE, you will be the hands-on…
Added 2 hours ago
A
Senior Sales Engineer
Ataccama
Toronto, ON
- Full-time
As a Senior Sales Engineer, you will work closely with Account Executives to drive sales engineering activities across the entire deal lifecycle. This role requires adaptability, deep…
Added 2 hours ago
BS
Technical Lead
Brainhunter Systems Ltd
Toronto, ON
- Contract
8+ years building and operating complex enterprise digital products, including experience as a Technical Lead, Staff Engineer or senior full-stack developer.
Added 2 hours ago
TC
RPA Platform Engineer
Tata Consultancy Services
Toronto, ON
- $90,000 to $100,000 CAD / year
- Full-time
The Senior Platform Engineer develops, maintains, and manages automation platforms across on-premises environments, AWS cloud, and vendor SaaS solutions to enable automation across…
Added 2 hours ago
S
Senior Electrical and Instrumentation Engineer
SPECTRAFORCE
Oakville, ON
- $60 to $63 CAD / hour
- Contract
…budget, and ensuring project risks are mitigated. This is a Senior role within the team, the chosen individual will complete the electrical and/or instrumentation design for a wide range of…
Added 2 hours ago
D
Senior Product Engineer II - Backend
Docebo
Remote, Canada
- $123,400 to $164,500 CAD / year
- Full-time
- Remote
As a Senior Product Engineer II, you bring deep expertise in backend engineering alongside strong working competency across the broader stack. You own complex features and technical…
Added 2 hours ago
C
Project Estimator
CIMA+
Montreal, QC
- Full-time
…what’s expected of us to meet the challenges of tomorrow and engineer a better…
Added 2 hours ago
A
Staff Developer
AtkinsRéalis
Toronto, ON · Montreal, QC
- Full-time
Act as a senior technical escalation point for Orb incidents and production issues, completing root-cause analysis, implementing fixes, validating outcomes, and coordinating follow-up with…
Added 3 hours ago
C
Project Estimator
CIMA+
Montreal, QC
- Full-time
…what’s expected of us to meet the challenges of tomorrow and engineer a better…
Added 3 hours ago
C
Project Estimator
CIMA+
Quebec, QC
- Full-time
…what’s expected of us to meet the challenges of tomorrow and engineer a better…
Added 3 hours ago
V
Senior NPI Engineer
Voltera
Waterloo, ON
- Full-time
…designs. Our second product, the NOVA materials dispensing system, offers precision dispensing of functional materials on both flexible and rigid substrates for flexible hybrid electronics…

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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