Overview
Expleo is a trusted partner for end-to-end, integrated engineering, quality services and management consulting for digital transformation. We help businesses harness unrelenting technological change to successfully deliver innovations that will help them gain a competitive advantage and improve the everyday lives of people around the globe.
We are looking for a highly capable, multi-disciplined engineer to support the end-to-end development, secure configuration, integration, and operation of secure computing products for our client in the Defence sector.
This role combines C# software engineering, secure operating system development, hardware handling, systems integration, and security-by-design practices. The engineer will work within a high-assurance, MOD-accredited environment involving products certified up to Top Secret baseline.
Responsibilities
Software Engineering (C# Focus)
Develop new C# software based on an existing Java codebase.
Translate and implement Java functionality into C#.
Provide limited Java support during the transition period.
Build middleware components, integration layers, and secure software modules.
Ensure all code conforms to secure-by-design and accreditation-driven standards.Secure Operating System Engineering
Support secure OS build and configuration activities for:
Windows 11 secure laptop OS builds
Windows Server 2025 virtualised/containerised platform
Containerised Linux-2 environments (future integration)
Assist with secure image creation, application deployment, lockdown configuration, and privilege control.
Follow government-accredited OS hardening and secure configuration guidelines.Hardware Engineering Activities
Build and wire engineering rigs for test and integration.
Dismantle and modify laptops for secure hardware changes, including:
Internal battery removal
Storage and memory replacement
Basic FPGA module handling
Adhere to Thales hardware security and handling procedures.Networking & Systems Integration
Support secure network configuration and integration activities.
Cable and integrate server kits, power amplifiers, logic controllers, and other connected components.
Assist with system-level integration between environments.
Qualifications
Degree (or equivalent experience) in Software Engineering, Computer Science, Cybersecurity, Electronics, or a related discipline.
Industry experience in secure systems, defence, national security, or high-assurance environments is advantageous.
Essential skills
Strong C# development experience, with the ability to work from and interpret existing Java logic.
Solid understanding of secure-by-design engineering practices.
Experience with Windows internals, secure OS image creation, or secure deployment processes.
Basic hardware engineering competency (laptop tear-down, component replacement, cabling).
Networking fundamentals applicable to secure system integration.
Experience with virtualisation and/or container technologies.
Proven problem-solving ability and a proactive, full-lifecycle engineering mindset.
Ability to operate effectively in MOD-accredited, high-assurance environments.
Desired skills
Experience with government-accredited secure configuration standards (e.g., NCSC, MOD JSP).
Familiarity with secure laptop builds, privileged access controls, or FIPS-accredited hardware.
Exposure to FPGA modules, hardware security modules, or custom hardware integration.
Knowledge of Windows Server 2025, Linux containerisation, or mixed-OS environments.
Experience in middleware development or system-level software integration.
What do I need before I apply
SC Cleared (mandatory)
Sole UK National
Applicants must be legally able to work in the UK and meet security requirements for restricted environments
Benefits
Collaborative working environment - we stand shoulder to shoulder with our clients and our peers through good times and challenges
We empower all passionate technology loving professionals by allowing them to expand their skills and take part in inspiring projects
Expleo Academy - enables you to acquire and develop the right skills by delivering a suite of accredited training courses
Competitive company benefits
Always working as one team, our people are not afraid to think big and challenge the status quo
As a Disability Confident Committed Employer we have committed to:
Ensure our recruitment process is inclusive and accessible
Communicating and promoting vacancies
Offering an interview to disabled people who meet the minimum criteria for the job
Anticipating and providing reasonable adjustments as required
Supporting any existing employee who acquires a disability or long term health condition, enabling them to stay in work at least one activity that will make a difference for disabled people"We are an equal opportunities employer and welcome applications from all suitably qualified persons regardless of their race, sex, disability, religion/belief, sexual orientation or age".
We treat everyone fairly and equitably across the organisation, including providing any additional support and adjustments needed for everyone to thrive
