IT Support jobs in Cardiff

Amentum is a global leader in engineering, project and programme management, and solutions integration. Built on strong programme and engineering delivery experience, supported by deep specialist capabilities, Amentum is a recognised partner across major UK Government and commercial programmes.

People are at the centre of what we do. We offer a competitive package designed to attract and retain talent. In addition to standard benefits, UK employees receive free single medical cover, digital GP services, enhanced family‑friendly policies, employee assistance programmes, and reimbursement for professional development. Our community initiatives include matched‑funding schemes, paid volunteering, and charitable contributions.

About the Opportunity:

Amentum are offering an exciting opportunity to join our growing team of IT professionals to work on a range of projects for our diverse client portfolio that covers Critical National Infrastructure, National Security, Defence and Nuclear market sectors. Our team is growing and are we looking for proactive and collaborative professionals of all levels to work within us in providing a range of services to our clients. With our deep technical, commercial, and strategic expertise we develop solutions that address our client’s critical challenges supporting digitalisation and security.

We are looking for a Systems Engineer with experience of Model Based System Engineering (MBSE) in a Defence or complex engineering environment to support the development of IT and communication systems across the full engineering lifecycle. You will play a key role in shaping complex Defence systems from concept through to design and delivery, ensuring robust, coherent solutions that underpin mission-critical capabilities.

Key Responsibilities:

• Elicit, analyse, and manage stakeholder and system requirements, ensuring traceability across the lifecycle.
• Develop system architectures and design artefacts, including functional, logical, and physical views.
• Support decomposition of requirements from system to subsystem and component levels.
• Contribute to the development of interface definitions and integration considerations across systems.
• Collaborate with architects, developers, and integration teams to ensure coherent and feasible system designs.
• Support verification and validation planning, ensuring requirements are testable and aligned to acceptance criteria.
• Contribute to systems engineering documentation and governance artefacts in line with MOD and industry standards.

Here's What You'll Need:

• Degree qualified in Systems Engineering, Engineering, Computer Science, or related discipline (or equivalent experience).
• Strong analytical and problem-solving skills.
• Good communication skills, able to engage with both technical and non-technical stakeholders.
• Ability to work collaboratively within multi-disciplinary teams.
• Experience working within multi-disciplinary teams on complex programmes.

Experience:

• Proven experience as a Systems Engineer within Defence or complex system environments with a strong understanding of systems engineering principles (i.e., MBSE) and lifecycle models (e.g. V-model, Agile, hybrid approaches).
• Experience working across the systems engineering lifecycle, with a focus on requirements, architecture, and design phases.
• Experience in requirements engineering, including elicitation, analysis, and management.
• Ability to develop system architecture artefacts and design documentation, with an understanding of system integration concepts, interfaces, and dependencies.
• Experience supporting integration and V&V activities, with an understanding of how designs translate into testable systems.

Standards & Frameworks:

• Familiarity with systems engineering standards (e.g. ISO/IEC/IEEE 15288).
• Awareness of MOD frameworks and governance environments.
• Understanding of requirements management and modelling tools (e.g. DOORS, SparxEA.

Our Culture:

Our values stand on a foundation of safety, integrity, inclusion, and diversity. We put people at the heart of our business, and we genuinely believe that we all succeed by supporting one another through our culture of caring. We value positive mental health and a sense of belonging for all employees.

We aim to embed inclusion and diversity in everything we do. We know that if we are inclusive, we are more connected, and if we are diverse, we’re more creative. We accept people for who they are, regardless of age, disability, gender identity, gender expression, marital status, mental health, race, faith or belief, sexual orientation, socioeconomic background, and whether you’re pregnant or on family leave. This is reflected in our wide range of Global Employee Networks centred on inclusion and diversity.

We partner with VERCIDA to help us attract and retain diverse talent. For greater online accessibility, please visit Promoting Equality & Diversity in Jobs and Career - VERCIDA to view and access our roles. As a Disability Confident employer, we will interview all disabled applicants who meet the minimum criteria for a vacancy. We welcome applications from candidates who are seeking flexible working and from those who may not meet all the listed requirements for a role.

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Application question(s):

• Do you currently have the permanent right to work in the UK without restriction or the need for company visa sponsorship

Work Location: Hybrid remote in Cardiff (Cardiff)