Senior Software Engineer

Millbank Holdings; East Knighton; On-site; GBP 50,000 - 70,000; Full time

Job summary

A leading marine defence firm in the UK seeks an Experienced Software Engineer to work on innovative projects supporting national defence. You will design and implement software systems using C++, Java, and UML while conducting peer reviews and unit testing. The role offers opportunities for professional development and the chance to impact high-profile projects within a secure environment. Candidates must be UK Nationals, and the company values diversity in its workforce.

Benefits

Accredited training opportunities

Professional development

Inclusive workplace

Support for diverse candidates

Qualifications

• Strong experience in C++ and/or Java development.
• Experience in UML software design and system architecture.
• Familiarity with sonar or situational awareness systems.

Responsibilities

• Design software systems using UML and implement in Java/C++.
• Conduct peer reviews of designs and validate through testing.
• Create documentation for development and compliance.

Skills

C++ programming

Java programming

UML software design

Peer review

Unit testing

Documentation

Tools

Enterprise Architect

MATLAB/Simulink

TCP/IP

Job description

Opportunity

Can you demonstrate strong experience in C++ and/or Java development, alongside UML software design? Do you have domain knowledge in sonar or tactical/situational awareness systems, and have you worked across the full software development life cycle? Are you looking to apply your engineering skills to projects that directly support national defence innovation?

The Opportunity

This is an exciting opportunity for an Experienced Software Engineer to contribute to cutting‑edge projects within the marine defence sector. The role has arisen due to expansion and the need for skilled engineers to design and implement advanced software systems supporting next‑generation defence applications. You'll be working on mission‑critical solutions, collaborating with talented peers, and applying your expertise in C++, Java, and UML to deliver robust, innovative systems. Benefits include professional development, accredited training opportunities, and the chance to make a tangible impact on high‑profile projects that shape the future of defence technology.

Your Duties and Responsibilities

• Design software systems using UML (Enterprise Architect)
• Implement designs in Java and/or C++
• Conduct peer reviews of design and code to ensure quality and robustness
• Perform unit testing to validate functionality
• Produce documentation and records to support system development and compliance

Qualifications & Experience

• Design software systems using UML (Enterprise Architect)
• Implement designs in Java and/or C++
• Conduct peer reviews of design and code to ensure quality and robustness
• Perform unit testing to validate functionality
• Produce documentation and records to support system development and compliance

Optional Skills

• Experience in sonar processing or signal processing
• Knowledge of Intel oneAPI (TBB, IPP, Math Kernel Library)
• Fortran programming skills
• Object‑oriented design expertise
• Algorithm optimisation and implementation experience
• Simulation and modelling using MATLAB/Simulink
• Background in service‑oriented architectures, micro‑services, and APIs
• Experience with TCP/IP network programming and comms middleware
• Familiarity with virtualisation and open architectures
• Database/SQL knowledge and data fusion experience
• JavaFX for operational display and data visualisation

Setting for the Role

This is a secure, project‑based role within the marine defence industry. You'll be working in a collaborative environment alongside engineers, stakeholders, and project teams, with access to accredited training and professional development. Due to the sensitive nature of the work, only UK Nationals are eligible.

Millbank Holdings Ltd is an equal opportunities employer committed to creating an inclusive and diverse workforce. We welcome applications from all suitably qualified individuals, regardless of background, and encourage candidates from underrepresented groups to apply.

We are proud to be a member of the Disability Confident Scheme, and we are committed to ensuring an accessible and supportive recruitment process for everyone. If you require any adjustments at any stage, please let us know and we'll do our best to accommodate.

Millbank operates as both an Employment Agency and an Employment Business.