Linux Systems Engineer | Outside IR35 | Remote

SR2 REC LTD; Greater London; Remote; GBP 83,000 - 124,000; Full time

Job summary

SR2 REC LTD is seeking a Linux Systems Engineer for a remote contract to support the upgrade and migration of established infrastructure services. This hands-on role covers Linux administration, legacy Unix migration, security improvements and operational automation.

You will own technical discovery, perform production upgrades and migrate the Solaris service onto RHEL, working with infrastructure, security and operations teams to ensure changes are validated and documented with clear handover

Qualifications

• Hands-on Linux systems administration across Debian and Red Hat Enterprise Linux.
• Experience delivering production upgrades and migrating Unix/Linux services.
• Ability to investigate system configurations, dependencies and issues.
• Knowledge of SSH, SFTP, access controls and user management.
• Scripting and automation for configuration, file transfers and maintenance.
• Experience planning cutovers and validating changes.
• Clear communication with security and support teams.

Responsibilities

• Assess existing infrastructure and plan changes.
• Deliver Debian upgrades and bring systems to a supported baseline.
• Build and configure a replacement RHEL environment and migrate services from Solaris.
• Strengthen SSH/SFTP controls and account administration.
• Improve automation, file-transfer and housekeeping scripts, monitoring and checks.
• Produce runbooks and document risks and recommendations.

Skills

Linux administration

Production upgrades

Unix/Linux migration

SSH / SFTP security

Automation scripting

Documentation

Communication with security teams

Job description

Linux Systems Engineer | Outside IR35 | Remote

We are looking for a Linux Systems Engineer to support the upgrade and migration of established infrastructure services. This is a hands‑on opportunity covering Linux administration, legacy Unix migration, security improvements and operational automation.

You'll take ownership of technical discovery, production upgrades and the migration of an existing Solaris service onto RHEL. Working alongside infrastructure, security and operational teams, you'll ensure changes are thoroughly validated and supported by clear documentation and a practical handover.

Key Responsibilities

• Assess existing infrastructure, service configurations and dependencies to establish requirements and plan changes.
• Deliver Debian production upgrades using an established approach, verifying functionality and bringing systems onto a supported baseline.
• Build and configure a replacement RHEL environment, migrate services from Solaris and manage production cutover.
• Strengthen SSH/SFTP controls and account administration in line with agreed security requirements.
• Improve configuration automation, file-transfer and housekeeping scripts, monitoring and operational checks.
• Produce runbooks, share knowledge with support teams and document outstanding risks and recommendations.

Essential

• Strong hands‑on Linux systems administration experience across Debian and Red Hat Enterprise Linux.
• Experience delivering production upgrades and migrating Unix/Linux services.
• Ability to investigate system configurations, dependencies and operational issues.
• Practical knowledge of SSH, SFTP, access controls and user account management.
• Scripting and automation experience for configuration, file transfers and routine maintenance.
• Experience planning cutovers, validating changes and preparing operational documentation.
• Clear communication skills and the ability to work closely with security and support teams.

Desirable

• Experience migrating workloads from Solaris to RHEL.
• Familiarity with HSCN-connected environments.
• Experience modernising legacy infrastructure and handing services over to ongoing support teams.

The Details

• Contract role
• Duration: Until the end of December initially and then until March + extensions
• IR35 status: Outside IR35
• Rate: £#removed#
• Location: Remote