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 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

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• Administer and maintain Linux (Ubuntu) server environments
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• Manage self-hosted Kubernetes clusters and supporting infrastructure
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• Support on-premise infrastructure including physical servers and virtualisation platforms
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• Administer storage solutions including NFS, iSCSI and object storage
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• Build and maintain automation using Ansible or similar IaC tools
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• Develop operational tooling using Bash and Python
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• Monitor system health using tools such as Prometheus, Grafana, Zabbix or Nagios
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• Investigate and resolve production incidents (on-call rota involved)
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• Implement security hardening and infrastructure best practices
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• Manage backup and disaster recovery processes and regular testing
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• Support and improve CI/CD pipelines and deployment processes
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• Collaborate with engineering teams to improve reliability and performance
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Essential Skills

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• Strong Linux systems administration (Ubuntu preferred)
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• Experience running production Kubernetes environments
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• Solid understanding of networking (TCP/IP, DNS, routing, firewalls)
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• Experience with physical servers and virtualisation platforms
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• Hands-on experience with Ansible or other IaC tools
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• Scripting skills in Bash and Python
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• Experience with monitoring and alerting platforms
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• Knowledge of Linux storage technologies (NFS, iSCSI)
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• Experience with backup & disaster recovery
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• Exposure to Active Directory / Entra ID / endpoint management
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• Strong troubleshooting and problem-solving skills
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Desirable Experience

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

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