Full job descriptionSite Reliability Engineer (Mid / Senior)
South West London (Hybrid – 1–2 days onsite)
Salary: Competitive + Benefits
We are looking for a Site Reliability Engineer to join a well-established small infrastructure team supporting a highly available, production environment. This is an exciting opportunity to work across a modern, self-hosted platform spanning Kubernetes, physical infrastructure and automation, with a strong focus on Ubuntu-based systems.
The Role
As an SRE, you will play a key role in ensuring the availability, 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 maintain Linux (Ubuntu) server environments
*Manage self-hosted Kubernetes clusters and supporting infrastructure
*Support on-premise infrastructure including physical servers and virtualisation platforms
*Administer storage solutions including NFS, iSCSI and object storage
*Build and maintain automation using Ansible or similar IaC tools
*Develop operational tooling using Bash and Python
*Monitor system health using tools such as Prometheus, Grafana, Zabbix or Nagios
*Investigate and resolve production incidents (on-call rota involved)
*Implement security hardening and infrastructure best practices
*Manage backup and disaster recovery processes and regular testing
*Support and improve CI/CD pipelines and deployment processes
*Collaborate with engineering teams to improve reliability and performance
Essential Skills
*Strong Linux systems administration (Ubuntu preferred)
*Experience running production Kubernetes environments
*Solid understanding of networking (TCP/IP, DNS, routing, firewalls)
*Experience with physical servers and virtualisation platforms
*Hands-on experience with Ansible or other IaC tools
*Scripting skills in Bash and Python
*Experience with monitoring and alerting platforms
*Knowledge of Linux storage technologies (NFS, iSCSI)
*Experience with backup & disaster recovery
*Exposure to Active 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 on complex, real-world infrastructure (not just cloud-native)
*High ownership in a small, collaborative team
*Exposure to a broad modern tech stack across infra, Kubernetes and automation
*Hybrid working with a competitive salary package