Senior Platform Engineer - Secure Operations

Are you ready to take on complex technical challenges supporting secure cross-domain services that protect national security? At Leonardo, our Senior Platform Engineers operate, maintain and improve secure gateway platforms that enable controlled information flow between security domains and keep our customers’ missions running. 
 
Your work at Leonardo UK will see you take the lead in solving customer problems in an agile, innovative and team-centric manner. The role may involve a blended hybrid working model, with a mixture of working from home and working on site at one of our Leonardo offices to ensure close collaboration with the wider team and with our customers. 

Leonardo UK is seeking a Senior Platform Engineer to join the Cyber & Security Solutions Division team. This role is focused on operating, maintaining, assuring and improving secure cross-domain gateway services that underpin critical defence, government and public sector operations. 
 
What you will do as a Senior Platform Engineer  

• Operate, maintain and support secure cross-domain gateway services across highly controlled environments. 

• Monitor service health, investigate issues and support incident, problem and change activity in line with agreed service processes. 

• Maintain secure configurations, transfer policies, rule sets and supporting documentation. 

• Support patching, upgrades, vulnerability remediation and service continuity activities. 

• Troubleshoot gateway, platform, network and data transfer issues across security boundaries. 

• Produce and maintain operational documentation, including build records, support guides, runbooks and configuration baselines. 

• Work with security, service management, engineering and customer stakeholders to ensure cross-domain services remain compliant, available and fit for purpose. 

• Identify and deliver continuous service improvements to improve reliability, security and operational efficiency. 

• Strong technical ability with experience operating and supporting secure platforms or gateway services in controlled environments. 

• A disciplined service mindset, with the ability to balance hands-on technical support, assurance, documentation and continuous improvement. 

• Confidence working across technical, security, service management and customer stakeholders to resolve issues and maintain service integrity. 

• Cross-domain solutions: operation, support and controlled configuration of data transfer between security domains (e.g. high-to-low, restricted-to-enterprise) 

• Windows and Linux operating systems 

• Virtualisation platforms (VMware, Hyper-V) 

• Secure data handling and policy enforcement (sanitisation, validation, filtering) 

• Experience with specific cross-domain or secure transfer products, such as Opswat or similar 

• Data diode or one-way transfer architectures 

• Integration with security tooling, such as SOC, SIEM or monitoring platforms 

• Performance and throughput optimisation for secure data transfer systems 

• Experience supporting service management processes, including incident, problem, change and configuration management 

• Experience with cloud platforms, such as AWS or Azure, and Infrastructure as Code 

• Hands-on use of DevSecOps tools, CI/CD pipelines or automation tooling 

• Containerisation platforms, such as Kubernetes or Docker 

This role is subject to pre-employment screening in line with the UK Government’s Baseline Personnel Security Standard (BPSS). An additional range of Personnel Security Controls referred to as National Security Vetting (NSV) will apply. This role requires Developed Vetting (DV) clearance prior to starting. For more information and guidance please visit: https://careers.uk.leonardo.com/gb/en/security-and-vetting 

This role is based at our Yeovil site.