Overview
Expleois 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:
o Windows 11 secure laptop OS builds
o Windows Server 2025 virtualised/containerised platform
o 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:
o Internal battery removal
o Storage and memory replacement
o 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 ourpeers 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
* ExpleoAcademy - 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
Disability Confident Commitment
* 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
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