Senior Platform Engineer (Cross Domain Gateway)

Job Description: Salary Range: £44,171 - £61,950 Leonardo UK operates a grade-based salary framework with broad bands. The salary range shown reflects the approved grade band for this role, or a narrower hiring range published within that band, and is benchmarked against the external market. Exceptions above the standard range are managed through governance controls to protect internal equity. Your Impact 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. What you’ll bring 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. Core areas (must have): 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) Implementation of controlled and auditable data transfer mechanisms Networking concepts (TCP/IP, DNS, DHCP, firewalls) Automation and scripting (PowerShell, Bash, Python, Ansible, Terraform) Knowledge of cyber security controls and accreditation requirements Experience across the systems engineering lifecycle Design and assurance of secure data flows across trust boundaries Delivery within highly controlled / secure environments (e.g. cross-domain, air-gapped, defence) I ncident, problem and change management Monitoring, patching, vulnerability remediation and service continuity Desirable: 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 Security Clearance 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: Location This role is based at our Yeovil site. Why join us At Leonardo, our people are at the heart of everything we do. We offer a comprehensive, company-funded benefits package that supports your wellbeing, career development, and work–life balance. Time to Recharge: Generous leave with the opportunity to accrue up to 12 additional flexi-days each year. Secure your Future: Award-winning pension scheme with up to 15% employer contribution. Your Wellbeing Matters: Free access to mental health support, financial advice, and employee-led networks. Never Stop Learning: Free access to 4,000+ online courses via Coursera and LinkedIn Learning. Tailored Perks: Spend up to £500 annually on flexible benefits such as private healthcare, lifestyle discounts, and gym memberships. Flexible Working: Flexible hours with hybrid working options. For a full list of our company benefits please visit our website. Leonardo is a global leader in Aerospace, Defence, and Security. Headquartered in Italy, we employ over 53,000 people worldwide including 8,500 across 9 sites in the UK. Our employees are not just part of a team—they are key contributors to shaping innovation, advancing technology, and enhancing global safety. At Leonardo we are committed to building an inclusive, accessible, and welcoming workplace. We believe that a diverse workforce sparks creativity, drives innovation, and leads to better outcomes for our people and our customers. If you have any accessibility requirements to support you during the recruitment process, just let us know. Be part of something bigger - apply now! Primary Location: GB - Yeovil - Lysander Rd Contract Type: Permanent Hybrid Working: Onsite