Site Reliability Engineer (Mid / Senior)

Site Reliability Engineer (Mid / Senior)

South West London (Hybrid – 1–2 days onsite)
Salary: Competitive + Benefits

We are looking for aSite Reliability Engineer to join a well-established small infrastructure team supporting a highly available, production environment. This is an exciting opportunity to work across amodern, self-hosted platform spanning Kubernetes, physical infrastructure and automation, with a strong focus onUbuntu-based systems.

The Role

As an SRE, you will play a key role in ensuring theavailability, performance, security and resilience of production systems. Working in a small, collaborative team, you’ll take ownership of day-to-day platform operations, incident response and continuous improvement, while partnering closely with development teams to deliver reliable and scalable services.

Key Responsibilities

• Administer and maintainLinux (Ubuntu) server environments
• Manageself-hosted Kubernetes clusters and supporting infrastructure
• Supporton-premise infrastructure including physical servers and virtualisation platforms
• Administer storage solutions includingNFS, iSCSI and object storage
• Build and maintainautomation using Ansible or similar IaC tools
• Develop operational tooling usingBash and Python
• Monitor system health using tools such asPrometheus, Grafana, Zabbix or Nagios
• Investigate and resolve production incidents (on-call rota involved)
• Implementsecurity hardening and infrastructure best practices
• Managebackup and disaster recovery processes and regular testing
• Support and improveCI/CD pipelines and deployment processes
• Collaborate with engineering teams to improve reliability and performance

Essential Skills

• StrongLinux systems administration (Ubuntu preferred)
• Experience runningproduction Kubernetes environments
• Solid understanding ofnetworking (TCP/IP, DNS, routing, firewalls)
• Experience withphysical servers and virtualisation platforms
• Hands-on experience withAnsible or other IaC tools
• Scripting skills inBash and Python
• Experience withmonitoring and alerting platforms
• Knowledge ofLinux storage technologies (NFS, iSCSI)
• Experience withbackup & disaster recovery
• Exposure toActive Directory / Entra ID / endpoint management
• Strong troubleshooting and problem-solving skills

Desirable Experience

• Object storage, MariaDB or database administration
• CI/CD tools such as Jenkins
• AWS (S3, Lambda, CloudFront) exposure
• Terraform or additional IaC tooling
• Experience with Harvester or similar platforms
• Knowledge of security, compliance or GDPR

Why Apply?

• Work oncomplex, real-world infrastructure (not just cloud-native)
• High ownership in asmall, collaborative team
• Exposure to abroad modern tech stack across infra, Kubernetes and automation
• Hybrid working with a competitive salary package