Senior Infrastructure Engineer

Plessey Semiconductors Ltd; Plymouth; On-site; GBP 65,000 - 90,000; Full time

Job summary

Plessey Semiconductors Ltd in Plymouth is seeking a Senior Infrastructure Engineer to strengthen our on-premise estate supporting Windows Server, Active Directory, VMware, Linux, storage and Kubernetes while expanding cloud workloads in AWS and Azure. You will patch, harden security, manage networks, and contribute to IaC with Terraform or similar, with on-call duties as required.

The role involves developing Kubernetes across environments, documenting architectures, and collaborating with teams

Qualifications

• Proven experience in a senior infrastructure engineering role, ideally in an on-premise environment.

Responsibilities

• Administer and support Plessey’s on-premise infrastructure, including Windows Server, Active Directory, VMware, Linux, storage and Kubernetes.
• Support and maintain networking, firewall, Intune and M365 platforms across the estate.
• Manage patching, vulnerability remediation and security hardening across infrastructure and endpoints.
• Support and maintain existing AWS and Azure workloads, with a focus on secure, efficient and cost-effective infrastructure.
• Develop and extend Kubernetes across on-premise and cloud environments, using Infrastructure as Code and CI/CD tooling.
• Contribute to infrastructure and IT projects, delivering solutions that meet business requirements.
• Produce clear technical documentation and share knowledge across the IT team to build resilience and reduce single points of failure.
• Provide senior technical guidance and support with incident response and on-call activities as required.

Skills

Windows Server

Active Directory

VMware vSphere

Linux

Kubernetes

Networking

AWS/Azure

PowerShell / Bash

Tools

Terraform

GitHub Actions

Nutanix

Prometheus/Grafana

Job description

We’re building the hardware foundation for next-era computing.

Plessey is a world-leading technology company driving the next generation of photonic devices and systems. With over 70 years of innovation, we combine research, materials science, process engineering, and manufacturing under one roof. We’re recognised as a global authority in microLED displays and optical interconnects.

Join us to work on breakthrough technologies shaping the future of light-based technology and computing

Location

Based in Plymouth

Our Values

Lead

We don’t follow industry trends; we create them, pushing boundaries and setting standards others aspire to. Every team member has the power to make decisions, drive change, and deliver excellence. We support each other, challenge one another for the best solutions, and lead by example. Together, we build industries and technologies that shape the future and scale toward our vision of the next era of computing.

Grow

We expand our capabilities every day — deepening our expertise, improving how we work, and pushing the boundaries of what’s possible. Curiosity fuels us: we question assumptions, explore new ideas, and innovate with light-based technologies. By investing in and empowering our people, we strengthen Plessey’s impact and help shape the future of optical technology.

Trust

We operate like a family—honest, reliable, and supportive. We have each other’s backs, own our actions, and uphold the highest standards of integrity and safety. We trust each other to deliver, our customers to challenge us, and our expertise to guide the way. Together, trust enables the collaboration essential for breakthrough innovation and lasting impact.

About the Role

This role exists to strengthen the depth and resilience of Plessey's on-premise infrastructure. We operate a mature estate spanning virtualisation, enterprise identity, networking, and core platform services, alongside continued growth in cloud-based workloads.

You will form part of the team responsible for the day-to-day health of this estate, building genuine depth alongside our existing platform expertise as the roadmap progresses. There is scope to specialise in key areas over time as capability builds across the team. Alongside this, a smaller and growing set of workloads runs in AWS and Azure, which you will support and maintain, working with the team to keep them secure and well managed.

Day to day, this includes patching, vulnerability management, and security hardening as part of the wider team, alongside project work to deliver IT solutions that meet business requirements.

Key Responsibilities

• Administer and support Plessey’s on-premise infrastructure, including Windows Server, Active Directory, VMware, Linux, storage and Kubernetes.
• Support and maintain networking, firewall, Intune and M365 platforms across the estate.
• Manage patching, vulnerability remediation and security hardening across infrastructure and endpoints.
• Support and maintain existing AWS and Azure workloads, with a focus on secure, efficient and cost-effective infrastructure.
• Develop and extend Kubernetes across on-premise and cloud environments, using Infrastructure as Code and CI/CD tooling.
• Contribute to infrastructure and IT projects, delivering solutions that meet business requirements.
• Produce clear technical documentation and share knowledge across the IT team to build resilience and reduce single points of failure.
• Provide senior technical guidance and support with incident response and on-call activities as required.

Experience & Attributes

• Proven experience in a senior infrastructure engineering role, ideally within an on-premise environment.
• Strong hands-on experience with Windows Server, Active Directory and Hybrid Azure AD.
• Experience administering VMware vSphere in a production environment.
• Strong experience with SAN and storage technologies.
• Good Linux knowledge, ideally RHEL or equivalent.
• Working knowledge of networking and firewall administration.
• Experience supporting AWS or Azure cloud environments.
• Practical experience administering Kubernetes, particularly on-premise clusters.
• Strong scripting skills in PowerShell or Bash.
• Good understanding of infrastructure security, patching and vulnerability management.
• Strong communication and documentation skills, with the ability to explain technical information clearly to a wider audience.
• Willingness to travel occasionally to other office locations as required.

Advantage

• Experience with Infrastructure as Code, such as Terraform or Bicep, and CI/CD tooling such as GitHub Actions.
• Experience with hyper-converged infrastructure, such as Nutanix.
• Experience with monitoring and observability tools such as Prometheus or Grafana.
• Relevant infrastructure or cloud certifications.
• Experience working within an operational technology or manufacturing environment.