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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Principal Platform Engineer (Cross Domain) - **Company:** Leonardo - **Location:** Yeovil, UK (Remote available) - **Salary:** £85,705.0 - **Contract:** Permanent contract - **Skills:** Microsoft Windows, Amazon Web Services, Systems Engineering, Microsoft Azure, Bash Shell, Computer Networks, Data Transmissions, Data Security, Dynamic Host Configuration Protocol, Linux, Domain Name System (DNS), Hyper-V, Python (Programming Language), Windows PowerShell, Ansible, Security Information and Event Management, TCP/IP, Virtualization Technology, DevOps Tools - Open-source, Firewalls (Computer Science), Containerization, Kubernetes, Terraform, Docker, Vmware - **Published:** August 17, 2026 - **Apply:** https://www.adzuna.co.uk/jobs/details/5844482264 ## About the Role * 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) * 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) Desirable: * 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) ## Description Leonardo UK is 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 or more platform engineering domains (e.g. cloud, virtualisation, automation, networking, or cyber tooling) providing specialist domain expertise to projects and programmes. * Lead the design and implementation of secure platforms across on-premise, hybrid, and cloud 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. ## Related Videos - [Docker network without Docker](https://www.wearedevelopers.com/videos/1418-docker-network-without-docker) - [Security Pitfalls for Software Engineers](https://www.wearedevelopers.com/videos/726-security-pitfalls-for-software-engineers) - [WebAssembly: The Next Frontier of Cloud Computing](https://www.wearedevelopers.com/videos/972-webassembly-the-next-frontier-of-cloud-computing) - [Docker Compose: Rediscovered](https://www.wearedevelopers.com/videos/1978-docker-compose-rediscovered) - [Docker exec without Docker](https://www.wearedevelopers.com/videos/1094-docker-exec-without-docker) - [Docker build without Docker](https://www.wearedevelopers.com/videos/100114-docker-build-without-docker) ## Related Articles - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers) - [Where To Find Software Engineering Jobs](https://www.wearedevelopers.com/magazine/396-where-to-find-software-engineering-jobs) - [The Most Popular IT Jobs on the Market](https://www.wearedevelopers.com/magazine/376-the-most-popular-it-jobs-on-the-market)