Linux Engineer

Linux Engineer 6-month contract London Outside of IR35

The Linux Engineer will play a central role in upgrading servers to Ubuntu 24.04 LTS while implementing stringent CIS Level 2 security standards across a diverse and business-critical environment.

The Linux Engineer will work closely with applications troubleshooting compatibility issues, identifying why hardened configurations break services, and delivering secure, practical solutions. The environment includes core banking systems, identity platforms, middleware, containerised workloads, and legacy applications, so adaptability and problem-solving are key.

Skills needed from the Linux Engineer:

• Strong Linux administration experience (Ubuntu preferred), including system internals and security
• Experience upgrading to Ubuntu 24.04 from an older version
• Advanced automation skills using Ansible and Bash scripting
• Hands‑on experience with system hardening standards and security frameworks (CIS compliant)
• Ability to troubleshoot complex environments and trace issues across systems and applications
• Experience upgrading servers in a 24/7 live environment
• Experience working with virtualised infrastructure and automated build pipelines
• Linux services, file systems, and security controls (e.g., access management, kernel settings)
• Container platforms and their interaction with host-level security
• Patch management, vulnerability scoring, and risk‑based remediation
• Managing and supporting mixed, partially documented application environments

Key responsibilities of the Linux Engineer:

• Upgrading Ubuntu 18.04 to 24.04
• Develop and maintain the Ubuntu 24.04 gold image and build pipeline
• Automate provisioning and hardening using Bash, cloud‑init, and Ansible
• Apply and tailor CIS Level 2 controls using industry tooling
• Investigate and resolve issues caused by hardening controls across a varied application estate
• Work with container platforms, system security policies, and legacy services to identify root causes
• Lead discovery sessions with application owners ahead of migrations

The Linux Engineer is required to work hybrid in Central London.