Senior System Administrator

Role Overview

• Design, implement, and maintain Nomad's global network and server infrastructure including data centres, VMware, and Azure cloud environments.
• Automate infrastructure provisioning, configuration, and management using tools such as Ansible or Puppet.
• Configure and manage network security including FortiGate firewalls, Linux based firewalls, VPNs, and routing protocols like BGP.
• Administer and secure Linux-based systems (Ubuntu/Debian).
• Serve as a 3rd line escalation point for complex infrastructure incidents, performing deep-dive troubleshooting and root cause analysis.
• Develop, maintain, and proactively analyse infrastructure monitoring solutions (e.g., Zabbix) to identify bottlenecks, optimise resource utilisation, and ensure system reliability.
• Manage and support containerised applications using Kubernetes, including cluster administration and lifecycle management.
• Create and maintain comprehensive documentation for infrastructure architecture, standard operating procedures, and disaster recovery plans.
• Collaborate with InfoSec teams to conduct security audits and implement remediation plans based on security best practices (e.g., OWASP Top 10).
• Drive continuous improvement by evaluating, prototyping, and recommending new technologies and automation opportunities to modernise the infrastructure.
• Guide and mentor engineers on technical best practices, contributing to their skill development and the overall capability of the team.
• Translate business requirements into robust technical solutions, effectively communicating the design, risks, and impact to both technical and non-technical stakeholders.

Requirements

• RHCE or equivalent experience
• CCNA or equivalent networking experience
• Kubernetes Certified Administrator or equivalent experience
• Microsoft Azure Certified or equivalent experience (desired)
• Computer Science degree or similar level of experience
• Minimum 5 years experience configuring and maintaining network infrastructure
• Experience with Linux based systems: Ubuntu/Debian
• Knowledge of automation tools such as Puppet, Ansible
• Security knowledge, OWASP top 10, NMAP scanning
• Data center Infrastructure management
• Monitoring solutions like Zabbix
• VMWare and FortiGate Firewalls
• Routing protocols such as BGP
• VPN management and deployment
• Azure infrastructure management

Tech Stack

• Ansible
• Azure
• Cloud
• Firewalls
• Kubernetes
• Linux
• Puppet
• VMware

Benefits

• Health Care Cash Plan
• Life Cover & Critical Illness Cover
• Contributory Pension Scheme via Aviva
• 25 Days of Annual Leave with enhanced leave based on tenure
• Option to buy an extra 5 days of annual leave per year
• Employee Referral Scheme / Employee Recognition Schemes
• Company Sick Plan