Senior Linux Infrastructure Operations Engineer

AtkinsRéalis Group; West of England; Hybride; GBP 70 000 - 95 000; Plein temps

Avantages offerts par ce poste

Hybrid working culture

Flexible holiday allowances

Training and professional development

Résumé du poste

AtkinsRéalis Group is seeking an experienced Linux systems administrator to manage and optimize our RHEL and Oracle Linux environments. The role emphasizes server administration, security hardening, patching, and performance optimization, with collaboration across engineering teams.

You will be responsible for automation using Ansible, maintaining Satellite repositories, and supporting on-call rotations to ensure high availability of production systems in a hybrid UK office setup.

Qualifications

• Experience in supporting production Linux server infrastructure.
• Support 300+ Linux servers across enterprise environ- ments.
• Bachelor’s degree in Computer Science or related field required.

Responsabilités

• Deploy and configure Linux OSs (RHEL, Oracle Linux) on servers.
• Administer centralized authentication/IdM, RBAC, and sudo policies.
• Patch management using Red Hat Satellite, Ansible, and security remediations.
• Maintain Linux server health, security hardening, and inventory baselines.
• Monitor performance, diagnose bottlenecks, and lead incident resolution.

Connaissances

RHEL administration

Oracle Linux

Linux security hardening

On-call support

Formation

Bachelor's degree in Computer Science or related field

Outils

Red Hat Satellite

Ansible

SCOM

ServiceNow

VMware vSphere

Nutanix

Description du poste

### **Job Description**## Overview This role is responsible for managing and optimizing the company’s Linux environments, primarily RHEL and Oracle Linux. It focuses on core activities such as server administration, security, and performance, with an emphasis on supporting production of Linux infrastructure. The selected candidate will work with the Engineering team to drive architecture and design improvements. Several of the responsibilities outlined below reflect the organization's target-state vision, which the successful candidate will help define and implement.**This role requires attendance in the office two days per week, with additional presence in Bristol as needed to support operational requirements.**## Your role * **System Installation and Configuration:** Deploy and configure Linux-based operating systems (RHEL, Oracle Linux) on servers including setting up network parameters, storage, and security settings.* **User Management:** Administer centralized authentication and identity management platforms such as Red Hat IdM. Create and maintain user groups, role-based access controls (RBAC), and host-based access controls. Configure and manage sudo policies, privileged command delegation, and privileged access monitoring. Perform regular access reviews and recertification activities to identify excessive permissions and inactive accounts.* **Patching Management:** Administer and maintain software repositories, content views, and package management infrastructure using Red Hat Satellite. Deploy software updates, patches, hotfixes, and security remediations via Ansible Automation Platform. Ensure all servers remain compliant with organizational security, vulnerability management, and software lifecycle policies. Troubleshoot package installation, repository connectivity, dependency conflicts, and software update failures. Generate compliance and patch status reports for management, audit, and security teams.* **Server Maintenance:** Maintain the health, stability, and security of Linux server environments, primarily Red Hat Enterprise Linux (RHEL) and Oracle Linux (OEL). Register and manage Linux servers within Red Hat Satellite. Apply and maintain security hardening standards, ensuring compliance with organizational security requirements. Maintain server inventories, configuration baselines, and lifecycle documentation. Troubleshoot and resolve server-related incidents, including hardware, operating system, and storage. Automate routine maintenance activities using Ansible, shell scripting, and enterprise automation platforms.* **Monitoring and Performance Optimization:** Monitor server health, system performance, resource utilization, and service availability across physical and virtual Linux environments. Investigate, troubleshoot, and resolve performance bottlenecks affecting CPU, memory, storage, network, and application services. Perform regular system health checks and optimisation activities to maximize uptime, efficiency, and operational stability. Analyse system metrics, logs, and audit data to identify recurring incidents, root causes, and opportunities for automation and improvement. A working knowledge of SCOM monitoring tool and ServiceNow is an asset.* **Troubleshooting and Issue Resolution:** Diagnose, investigate, and resolve complex Linux operating system, network, storage, and infrastructure issues across enterprise environments. Perform root cause analysis (RCA) for incidents and recurring problems, implementing permanent corrective actions to prevent reoccurrence. Lead the resolution of critical production incidents, ensuring minimal service disruption and adherence to agreed service levels. Troubleshoot issues related to RHEL, virtualization platforms, identity management, storage, networking, backup solutions, and automation tools. Develop and maintain troubleshooting procedures, knowledge articles, and technical documentation to improve operational effectiveness. Conduct post-incident reviews and recommend service improvements, configuration changes, and preventative maintenance activities.* **Backup and Disaster Recovery:** manage system backup to ensure data integrity and contribute to disaster recovery plan activation or testing.* **Shell Scripting and Automation:** Code and maintain shell scripts and automation tools to streamline repetitive tasks and improve system efficiency. Automate routine administrative tasks using shell scripting / Ansible. Knowledge of Ansible, playbook and YAML is desired.* **Virtualization:** Manage virtual machines (e.g., VMware, Nutanix)* **System Security Auditing and Compliance:** Conduct security audits and ensure Linux systems comply with relevant security standards and policies.* **Continuous Learning:** Stay up to date with the latest advancements in Linux technologies and acquire new skills to enhance system administration capabilities.* **Collaboration:** Coordinate with other IT teams, developers, and stakeholders to support various projects and ensure smooth integration of Linux systems with other components.* **Documentation:** Maintain a comprehensive documentation of system configurations, procedures, and troubleshooting steps for future reference.* **Availability:** Be available on call as per the on-call roster including on weekends to implement planned changes OR resolve production outages. Extend shift if required to resolve production outages.* **Continuous service improvements:** Initiate, own and implement service improvements including automation that can improve processes, reduce outages, incidents, make environment more stable, reduce effort required to support, minimize/mitigate risks, improve customer satisfaction etc. The above responsibilities may be revised as per the business requirement.## About you * Experience in supporting production Linux server infrastructure.* Experience in Level 3 role supporting more than 300 Linux servers.* Bachelor’s degree in computer science, Information Technology, or equivalent combination of education and experience in a related field## Rewards & benefitsExplore the rewards and benefits that help you thrive – at every stage of your life and your career. Enjoy competitive salaries, employee rewards and a brilliant range of benefits you can tailor to suit your own health, wellbeing, financial and lifestyle choices. Make the most of a myriad of opportunities for training and professional development to grow your skills and expertise. And combine our hybrid working culture and flexible holiday allowances to balance a great job and fulfilling personal life.Rewards and benefits – Careers at AtkinsRéalis## About AtkinsRéalisWe're AtkinsRéalis, a world-class engineering services and nuclear organization. We connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants, designers, engineers and project managers, we can change the world. We're committed to leading our clients across our various end markets to engineer a better future for our planet and its people.Find out more.## Additional information**Security clearance**This role may require security clearance and offers of employment will be dependent on obtaining the relevant level of clearance. If this is necessary, it will be discussed with you at interview. The vetting process is delivered by United Kingdom Security Vetting (UKSV) and may require candidates to provide proof of residency in the UK of 5 years or longer. If applying to this role please do not make reference to (in conversation) or include in your application or CV, details of any current or previously held security clearance.We are committed to creating a culture where everyone feels that they belong - a place where we can all be ourselves, thrive and develop to be the best we can be. So, we offer a range of family friendly, inclusive employment policies, flexible working arrangements and employee resource groups to support all employees. As an Equal Opportunities Employer, we value applications from all backgrounds, cultures and ability.As a Disability Confident Leader, we are committed to offering an interview to all applicants who have a disability and meet the essential criteria. If you would like to be considered under this commitment, please let us know at the application stage.