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Added 1 month ago
AI
Senior Software Developer
ATS Industrial Automation
Woodbridge, ON
- Full-time
ATS is an industry-leading automation solutions provider to many of the world’s most successful companies. The ATS Test Division specializes in developing custom in-process and End-of-Line…
Added 1 month ago
AI
Senior Controls Systems Software Designer
ATS Industrial Automation
Woodbridge, ON
- Full-time
As a member of a highly motivated, multidisciplinary team, you will design and develop world-class automation solutions while planning and leading projects with full responsibility for…
Added 1 month ago
L
Senior Software Automation Engineer
Lumentum
Ottawa, ON · Canada - Ottawa (Bill Leathem)
- Full-time
Expertise in test automation, including interaction with devices under test and test equipment.
Added 1 month ago
UO
Systems Administrator & Business Analyst
University of Niagara Falls Canada
Niagara Falls, ON
- $90,000 to $110,000 CAD / year
…and integrations. As a Business Analyst, they work directly with operational teams - particularly the Registrar's Office and Finance - to understand business needs, improve processes,…
Added 1 month ago
Senior Software Engineer (Senior AI Engineer)
Scotiabank
Toronto, ON
Experience with Python, particularly FastApi, Gemini (or any LLM Provider) API development, Asyncio/multiprocess management tooling is strongly preferred
Added 1 month ago
PF
Senior Test Automation Engineer
PureFacts Financial Solutions
Toronto, ON
- $100,000 to $120,000 CAD / year
Design, develop, and maintain scalable automation frameworks using Java, Python, and Playwright.
Added 1 month ago
E
Concepteur(trice) logiciel II
EXFO
Montreal, QC · Quebec, QC
- Full-time
Expérience de programmation avec plusieurs langages modernes, incluant une exposition à Python, Go et JavaScript/TypeScript.
Added 1 month ago
PC
SOAR Service Lead
Pwc Canada
Calgary, AB · Vancouver, BC · Ottawa, ON · Toronto, ON
- Full-time
Collaborate with cross-functional stakeholders to translate business needs into technical automation strategies
Added 1 month ago
CI
AI Enginering Technical Lead (Permanent)
CoreFactor Inc.
Toronto, ON
- Full-time
Strong proficiency in Java, Python and Node.js for backend service integration with CCaaS or AI applications.
Added 2 months ago
KC
Bilingual Senior AWS Platform Engineer
KPMG Canada
Vaughan, ON
- Full-time
Troubleshoot complex infrastructure, automation, deployment, and platform issues, including coordination with internal teams and vendors where required.
Added 2 months ago
KC
Bilingual Senior AWS Platform Engineer
KPMG Canada
Oakville, ON
- Full-time
Troubleshoot complex infrastructure, automation, deployment, and platform issues, including coordination with internal teams and vendors where required.
Added 2 months ago
KC
Bilingual Senior AWS Platform Engineer
KPMG Canada
Hamilton, ON
- Full-time
Troubleshoot complex infrastructure, automation, deployment, and platform issues, including coordination with internal teams and vendors where required.
Added 2 months ago
KC
Bilingual Senior AWS Platform Engineer
KPMG Canada
Montreal, QC
- Full-time
Troubleshoot complex infrastructure, automation, deployment, and platform issues, including coordination with internal teams and vendors where required.
Added 2 months ago
KC
Bilingual Senior AWS Platform Engineer
KPMG Canada
Boisbriand, QC
- Full-time
Troubleshoot complex infrastructure, automation, deployment, and platform issues, including coordination with internal teams and vendors where required.
Added 2 months ago
P
Senior Software Engineer
Prophix
Toronto, ON · Etobicoke, ON
- Full-time
…Prophix One™ brings planning, reporting, consolidation, and automation together in a single place, and we are expanding its AI capabilities faster than ever. If you want to work on a…
Added 2 months ago
G
Spécialiste livraison et soutien / Delivery & Support Specialist - Unification
Genetec
Montreal, QC
- Full-time
Added 2 months ago
JG
Kafka Administrator
J&M Group
Toronto, ON
- Full-time
Automate administrative and operational tasks using Shell scripting, Python, or other automation tools.
Added 1 month ago
A
Product - Senior Manager/Manager, Product Distribution & Transportation
Aritzia
Vancouver, BC
- Full-time
With a Global Support Campus in Vancouver and additional Support Office hubs in major cities across North America - including Toronto, New York, Los Angeles and Seattle - our workplace…
Added 1 month ago
B
Data Engineer
BMO
Toronto, ON · SCC
- Full-time
Hands on experience with SQL, NoSQL, Python , Spark/PySpark, Scala
Added 1 month ago
B
Data Engineer
BMO
Toronto, ON · SCC
- Full-time
Hands on experience with SQL, NoSQL, Python , Spark/PySpark, Scala
Added 1 month ago
SS
Enterprise Integration Engineer
State Street
Toronto, ON
- Full-time
The ideal candidate should possess strong platform administration expertise, automation experience, integration capabilities, governance knowledge, and a customer-focused mindset. The…
Added 1 month ago
TR
Applied Research Intern (NLP/ML/GenAI)
Thomson Reuters
Toronto, ON · Canada, Toronto, Ontario
- Full-time
…Reuters Labs in Toronto is seeking an ML/NLP scientist intern with a passion for problem-solving using state-of-the-art Machine Learning and Natural Language Processing…
Added 1 month ago
Business Consultant - KYC & Client Lifecycle Management
NTT DATA Services
Toronto, ON
NTT DATA strives to hire exceptional, innovative and passionate individuals who want to grow with us. If you want to be part of an inclusive, adaptable, and forward-thinking organization,…
Added 1 month ago
L
Senior Optical Characterization and Test Engineer
Lumentum
Ottawa, ON · Canada - Ottawa (Bill Leathem)
- Full-time
Expertise in test automation, including interaction with devices under test and test equipment.
Added 2 months ago
F
Data Engineer
Financeit
Toronto, ON
- $75,000 to $95,000 CAD / year
- Full-time
Python proficiency for pipeline development, data transformation, and scripting automation tasks

Closed listing

OnX

Sr. Engineer System administrator

Toronto, ON, Canada

Full-time

This opening has closed.

The original listing is kept below for reference.

Find open jobs More jobs with this employer

About employer

Job details

Job type: Full-time
Closing date: Sep 5, 2026
Posting language: English
Posted: Aug 6, 2026

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Original job description

Archived listing. The details below describe a past opening.

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.

About employer

More about this job

Responsibilities

The role involves administering and securing enterprise Windows and Linux server environments across on-premises and cloud platforms. Key duties include system patching, performance optimization, automation of operational processes, and mentoring junior team members.

Requirements

Candidates must have a bachelor's degree in a technical field and at least 6 years of IT infrastructure experience, with 5 years specifically in systems administration. Proficiency in Linux, Windows Server, and cloud platforms like AWS or Azure is required.

Skills

Linux Administration
Windows Server Administration
Unix Administration
AWS Administration
Infrastructure Monitoring
Operating System Patching
Security Hardening
Server Lifecycle Management
Python
Bash Scripting
PowerShell
Virtualization
Capacity Planning
Automation
Citrix XenServer

Benefits

Competitive compensation
Bonus
Commission
Professional development
Certification support
Flexible work options

Visa sponsorship

Not detected in the job text

Keywords

Linux
Windows Server
Wintel
Unix
AWS
Microsoft Azure
Citrix XenServer
Sun Solaris
AS/400
WSUS
Python
Bash
PowerShell
Infrastructure as Code
Vulnerability Remediation
SLA
MTTR
Virtualization
Cloud Computing
System Hardening
Capacity Planning
IT Infrastructure
Managed Services
Enterprise Server
Patch Management
Configuration Management
Security Baselines
Infrastructure Services
IT Consulting

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