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, maintainand 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, innovativeand 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 SeniorPlatform Engineer to join the Cyber & Security Solutions Division team. This role is focused on operating, maintaining, assuringand improving secure cross-domain gateway services that underpin critical defence, governmentand public sector operations.

What you will do as a SeniorPlatform Engineer

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

• Monitor service health, investigate issuesand support incident, problemand change activity in line with agreed service processes.

• Maintain secure configurations, transfer policies, rule setsand supporting documentation.

• Support patching, upgrades, vulnerability remediationand service continuity activities.

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

• Produce and maintainoperational documentation, including build records, support guides, runbooksand configuration baselines.

• Work with security, service management, engineeringand customer stakeholders to ensure cross-domain services remaincompliant, availableand fit for purpose.

• Identifyand deliver continuous service improvements to improve reliability, securityand operational efficiency.

What you’llbring

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

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

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

Core areas (must have):

• Cross-domain solutions: operation, supportand controlled configuration of data transferbetween 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)

• Incident, problemand change management

• Monitoring, patching, vulnerability remediationand service continuity

Desirable:

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

• Data diode or one-way transfer architectures

• Integration with security tooling, such as SOC, SIEM or monitoringplatforms

• Performance and throughput optimisation for secure data transfer systems

• Experience supporting service management processes, including incident, problem, changeand configuration management

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

• Hands-on use of DevSecOps tools, CI/CD pipelinesor 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 additionalrange of Personnel Security Controls referred to as National Security Vetting (NSV) will apply. This role requires Developed Vetting (DV) clearance prior to starting.Formore information and guidance please visit: https://careers.uk.leonardo.com/gb/en/security-and-vetting

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 accrueup to 12 additionalflexi-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!

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