Site Reliability Engineer

Site Reliability Engineer | Linux, Networking & Infrastructure

Up to £120K + Stock Options + Benefits | Remote First, UK

Plan A Digital is recruiting for a growing FinTech company building high-performance infrastructure for global financial markets.

We are looking for an experienced Site Reliability Engineer with strong Linux and network engineering foundations who enjoys working across the full infrastructure stack.

This is a highly technical, hands-on position covering physical infrastructure, Linux, networking, automation, and cloud. You will join a multi-disciplinary engineering team where engineers have their own areas of expertise but share responsibility for the wider production environment.

The Role

You will work across a broad range of infrastructure engineering projects, including:

• Automating the provisioning of physical servers, networks and cloud infrastructure
• Building and provisioning bare-metal Linux servers
• Configuring and troubleshooting physical network infrastructure
• Working with switches, VLANs, routing and TCP/IP
• Linux administration, troubleshooting and kernel-level configuration
• Developing infrastructure automation using Ansible and code
• Building tooling using Python, Go, Java, Bash or similar
• Improving continuous delivery and infrastructure provisioning processes
• Supporting highly available production infrastructure
• Working across physical datacentre and AWS/GCP environments
• Working with hardware, telecoms and other external technology providers

What We Are Looking For

You will ideally come from a strong Linux systems administration, network engineering or infrastructure engineering background, with experience across both systems and networking.

Key experience includes:

• Strong Linux systems administration and troubleshooting
• Linux kernel configuration, tuning and performance
• Hands-on physical network hardware
• Switch configuration and VLANs
• Routing, routing protocols, TCP/IP and subnetting
• Network and connectivity troubleshooting
• Bare-metal server provisioning and physical infrastructure
• Ansible or similar configuration automation
• Ability to code and build tooling in Python, Go, Java or another programming language
• Bash/shell scripting
• AWS and/or GCP
• Experience working with external technology or infrastructure vendors

Experience with technologies such as Cisco, Juniper, Arista, or F5 would be particularly relevant.

The Environment

Automation is central to the team, with infrastructure configuration and provisioning heavily automated. You should bring strong technical depth in your core areas, while being comfortable working across the wider infrastructure, taking ownership and learning new technologies.

Experience with SAML, OAuth2, Kerberos, Active Directory/Entra ID or PostgreSQL HA would be useful but is not essential.

Why Join?

• Up to £120K base salary
• Stock options + comprehensive benefits
• Remote-first within the UK
• Highly technical engineering environment
• Work on mission-critical infrastructure within financial markets
• Broad exposure across Linux, networking, bare metal, automation and cloud
• Significant autonomy and engineering ownership
• Opportunity to build and automate infrastructure rather than simply maintain it

This opportunity will particularly suit an engineer who has developed strong Linux and networking fundamentals and wants a role where physical infrastructure, automation and cloud all form part of the same engineering environment.

If that sounds like your background, we would be keen to speak with you.