Linux System Administrator

Role Overview

The Linux System Administrator will provide hands-on production support for client Linux servers at DefinitionIT. This part-time contractor role is capped at up to 20 hours per month and requires availability during Canada EST business hours with the possibility of after-hours support. AWS cloud exposure is an added advantage.

Key Responsibilities

• Install, configure, maintain, and patch Linux servers (RHEL, CentOS, Ubuntu).
• Ensure CRS servers meet operational and security standards with routine health checks.
• Manage file systems, mount points, disk utilization, and local repositories.
• Administer web servers, implement SSL certificates, encryption, and harden Linux environments.
• Manage users, permissions, and support data migrations and backups.
• Collaborate on backup strategies, monitor system performance, and support capacity planning.
• Provide technical support during deployments and maintain documentation and runbooks.

Availability & Engagement Model

This is a part-time contractor role limited to up to 20 hours per month with hourly billing strictly for actual client support hours. The primary working window is aligned to Canada EST (6:30 PM – 2:30 AM IST), and on-demand availability is required.

Required Qualifications

• 4–7 years of hands-on Linux System Administration experience.
• Strong knowledge of Linux OS, filesystems, permissions, networking, and troubleshooting.
• Experience with SSL, encryption, backups, and monitoring tools.
• Ability to support production environments independently with strong communication skills.

Added Advantage

• Exposure to AWS Cloud (EC2, S3, IAM, VPC, Security Groups).
• Experience with hybrid (on-prem and cloud) environments.
• Knowledge of cloud backups, snapshots, and cost optimization.

Key skills/competency

• Linux
• System Administration
• RHEL
• CentOS
• Ubuntu
• AWS
• SSL
• Encryption
• Backup
• Monitoring