Principal Platform Engineer (Cross Domain)

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.

Windows and Linux operating systems

Virtualisation platforms (VMware, Hyper-V)

Cross-domain solutions: design and implementation of data transfer between security domains (e.g. high-to-low, restricted-to-enterprise)

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)

Experience with cross-domain / secure transfer solutions (e.g. Opswat or similar)

Data diode / one-way transfer architectures

Integration with security tooling (SOC, SIEM, monitoring platforms)

Performance and throughput optimisation for secure data transfer systems

Expertise with cloud platforms (AWS, Azure) and Infrastructure as Code

Hands-on use of DevSecOps tools and CI/CD pipelines

Containerisation platforms (Kubernetes, 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

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!

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