Specialist, Linux Administration

Colt Technology Services; Greater London; Hybrid; GBP 85,000 - 110,000; Full time

Benefits offered by this job

Flexible working hours

Work from home option

Mentor program

Professional development

Job summary

Colt Technology Services is seeking a Senior Linux Administrator to design, implement, and optimise Linux infrastructure underpinning critical business applications. You will collaborate with security and operations teams, contribute to roadmaps, and drive automation across ~4000 Linux systems.

The role requires deep technical expertise, strong troubleshooting, and leadership in complex Linux environments, with the option for flexible/hybrid working arrangements.

Qualifications

• Bachelor’s degree in Computer Science, Information Technology, or related field (or equivalent experience).
• 8+ years of Linux administration experience, ideally within a large scale or enterprise environment.
• Experience with cloud platforms (AWS, Azure, GCP).
• Familiarity with containerization (Docker, Kubernetes).
• Certifications such as RHCE, LFCS, LFCE, or security related credentials.

Responsibilities

• Serve as a senior technical expert for Linux systems, providing advanced engineering support and guidance.
• Contribute to the definition and implementation of technology roadmaps for Linux infrastructure and associated services.
• Develop and maintain operating procedures to ensure secure, stable, and efficient system management.
• Design and implement solutions that meet security, compliance, resilience, and high availability requirements.
• Drive automation using Ansible and other tools to streamline operational tasks and reduce manual effort.
• Lead complex troubleshooting activities across Linux platforms and integrated technologies.
• Support patching, hardening, and configuration management activities aligned to security and compliance standards.
• Work closely with security and compliance teams to ensure adherence to regulatory frameworks and internal controls.
• Support and enhance DNS and identity management solutions, including Red Hat and Oracle LDAP.
• Develop and maintain documentation for engineering solutions, operational processes, and compliance audits.
• Participate in the Infrastructure Operations on call rota to provide out of hours support for priority incidents.

Skills

Linux administration

Cloud platforms

Containerization

RHCE LFCS LFCE

Education

Bachelor's degree in CS/IT or equivalent

Tools

Docker

Kubernetes

AWS

Azure

GCP

Job description

Specialist, Linux Administration

Colt provides network, voice and data centre services to thousands of businesses around the world, allowing them to focus on delivering their business goals instead of the underlying infrastructure.

Why we need this role

We are seeking a highly skilled Senior Linux Administrator who will act as a technical subject matter expert within the Linux Engineering team. The role is accountable for designing, implementing, supporting, and optimising the Linux infrastructure that underpins critical business applications.

The successful candidate will work as part of a team supporting approximately 4000 Linux systems, contributing to technology roadmaps, automation initiatives, operational excellence, and continuous improvement. This role requires deep technical expertise, strong troubleshooting skills, and the ability to collaborate effectively with architecture, security, and operations teams across the organisation.

What You Will Do

• Serve as a senior technical expert for Linux systems, providing advanced engineering support and guidance.
• Contribute to the definition and implementation of technology roadmaps for Linux infrastructure and associated services.
• Develop and maintain operating procedures to ensure secure, stable, and efficient system management.
• Design and implement solutions that meet security, compliance, resilience, and high availability requirements.
• Drive automation using Ansible and other tools to streamline operational tasks and reduce manual effort.
• Lead complex troubleshooting activities across Linux platforms and integrated technologies.
• Support patching, hardening, and configuration management activities aligned to security and compliance standards.
• Work closely with security and compliance teams to ensure adherence to regulatory frameworks and internal controls.
• Support and enhance DNS and identity management solutions, including Red Hat and Oracle LDAP.
• Develop and maintain documentation for engineering solutions, operational processes, and compliance audits.
• Participate in the Infrastructure Operations on call rota to provide out of hours support for priority incidents.

Qualifications

• Bachelor’s degree in Computer Science, Information Technology, or related field (or equivalent experience).
• 8+ years of Linux administration experience, ideally within a large scale or enterprise environment.
• Experience with cloud platforms (AWS, Azure, GCP).
• Familiarity with containerization (Docker, Kubernetes).
• Certifications such as RHCE, LFCS, LFCE, or security related credentials.

Benefits

• Flexible working hours and the option to work from home.
• Extensive induction program with experienced mentors and buddies.
• Opportunities for further development and educational opportunities.
• Global Family Leave Policy.
• Employee Assistance Program.
• Internal inclusion & diversity employee networks.

Diversity and inclusion

• Inclusion and valuing diversity of thought and experience are at the heart of our culture here at Colt. From day one, you’ll be encouraged to be yourself because we believe that’s what helps our people to thrive. We welcome people with diverse backgrounds and experiences, regardless of their gender identity or expression, sexual orientation, race, religion, disability, neurodiversity, age, marital status, pregnancy status, or place of birth.