Role: Linux System Administrator
Location: Toronto, ON
Work Mode: Onsite
Job Summary
We are seeking an experienced Linux System Administrator with strong expertise in Linux server administration, infrastructure automation, and configuration management. The ideal candidate will have hands-on experience with RHEL/Linux, Ansible, Puppet, Foreman, and Qualys, along with working knowledge of IBM WebSphere Application Server (WAS).
The role involves managing and maintaining enterprise Linux infrastructure, automating administrative tasks, ensuring system security and stability, and supporting mission-critical production environments.
Key Responsibilities
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Install, configure, administer, and maintain Linux servers, primarily Red Hat Enterprise Linux (RHEL), across production environments.
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Perform server provisioning, patching, upgrades, capacity planning, performance tuning, and system maintenance.
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Manage Linux users, groups, permissions, file systems, storage, networking, services, and security configurations.
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Develop, maintain, and execute Ansible playbooks, roles, and scripts to automate server administration, configuration management, patching, and deployment activities.
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Manage configuration and infrastructure automation using Puppet and Foreman.
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Perform vulnerability scanning, assessment, remediation, and compliance activities using Qualys.
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Monitor system performance, availability, resource utilization, and overall infrastructure health.
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Troubleshoot complex Linux infrastructure issues, perform root cause analysis (RCA), and implement permanent solutions.
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Provide administration and operational support for IBM WebSphere Application Server (WAS), including deployments, configuration, service management, log analysis, and troubleshooting.
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Support production changes, incident management, maintenance windows, and security remediation activities.
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Maintain technical documentation, standard operating procedures (SOPs), and infrastructure support guidelines.
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Collaborate with application, middleware, security, and infrastructure teams to ensure reliable IT operations.
Required Technical Skills
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Strong hands-on experience in Linux System Administration, preferably Red Hat Enterprise Linux (RHEL).
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Mandatory experience with Puppet, Foreman, and Qualys.
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Hands-on experience with Ansible, including playbooks, roles, and automation.
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Strong knowledge of Shell/Bash scripting and Linux command-line utilities.
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Experience with Linux server provisioning, patching, upgrades, configuration management, and performance monitoring.
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Good understanding of Linux networking, storage, file systems, permissions, and system security.
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Working knowledge of IBM WebSphere Application Server (WAS) administration and troubleshooting.
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Experience with vulnerability management, security remediation, and infrastructure compliance.
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Experience supporting 24x7 enterprise production environments.
Preferred Qualifications
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Experience working in large-scale enterprise IT infrastructure environments.
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Knowledge of ITIL processes, incident management, problem management, and change management.
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Familiarity with monitoring tools and infrastructure health-check procedures.
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Strong analytical, troubleshooting, documentation, and communication skills.
Ideal Candidate Profile
A hands-on Linux Infrastructure Administrator with strong expertise in RHEL, Puppet, Foreman, Qualys, and Ansible, capable of managing enterprise Linux environments, automating infrastructure operations, and supporting production systems. Exposure to IBM WebSphere Application Server is also required.
