Due to the nature of the role, an active DV Clearance is required for the role.
The successful candidates must be able to work full time onsite in Yeovil, Minimum 3/4 days on site but full working week on site. (Extended hours can be done to shorten actual days working on site)

Please note this role is Inside IR35.

Your Impact
We are seeking a Principal Platform Engineer to join the Cyber & Security Solutions Division team. This role is focused on delivering, maintaining, and improving platform and systems engineering solutions that underpin critical defence, government and public sector services.

What you will do as a Principal Platform Engineer

Act as the technical authority on one of our platform engineering domains (eg virtualisation) providing specialist domain expertise to projects and programmes.

Lead the design and implementation of secure platforms across on-premise environments.

Capture, analyse, and interpret complex customer requirements to drive system design and architecture.

Develop high- and low-level designs, ensuring alignment with secure-by-design principles.

Take ownership of technical delivery within work packages, including planning, estimation, and progress reporting.

Mentor, coach, and develop junior and senior engineers, raising technical capability across the community.

Provide input to technology strategies, feasibility studies, and innovation projects.

Engage with internal and external stakeholders, presenting technical solutions and justifying design decisions.

Experience required:
Extensive technical expertise across multiple platform domains, with a track record of delivering secure solutions.
The ability to balance hands-on engineering with technical leadership and mentorship.
A problem-solving mindset, able to innovate and recommend the best approach for complex challenges.

Core areas (must have):
Windows and Linux operating systems
Virtualisation platforms (VMware, Hyper-V)
VMware Cloud Foundation (VCF) stack (vSphere, vSAN, NSX-T, Aria Suite)
Design, build and operation of software-defined datacentre platforms
Network virtualisation and micro-segmentation concepts (NSX, platform-integrated)
Networking concepts (TCP/IP, DNS, DHCP, Firewalls)
Automation and Scripting (PowerShell, Bash, Python, Ansible, Terraform)
Knowledge of (SbD) cyber security controls and accreditation requirements
Experience across the systems engineering life cycle
Integration of compute, storage, and network layers into a unified platform
Delivery within secure/enterprise/defence environments

Desirable:
VCAP certification
Expertise with cloud platforms (AWS) and Infrastructure as Code
Experience integrating enterprise services (Active Directory, PKI, monitoring, SIEM)
Hands-on use of DevSecOps tools and CI/CD pipelines
VxRail and hyper-converged infrastructure
Automation of VCF life cycle (patching, upgrades, deployment)
Integration with enterprise identity and security services (AD, PKI, PAM)
Containerisation platforms (Kubernetes, Docker)