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 qualified 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.

Required Technical Skills 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.

📌 Sr. Engineer System administrator (Toronto)
🏢 CBTS
📍 Toronto