Business Architecture Modeller

Originally named Great British Nuclear, Great British Energy - Nuclear is an arm’s length body of the Department for Energy Security and Net Zero, dedicated to supporting the development and deployment of new nuclear technologies in Great Britain. We play a crucial role in advancing nuclear new build, ensuring the UK’s energy security and achieving net-zero carbon emissions.

Great British Energy - Nuclear focuses on fostering innovation, facilitating investment, and coordinating efforts across the nuclear industry to build a resilient and sustainable energy future.

Great British Energy - Nuclear’s first step was to start the technology selection process for Small Modular Reactors (SMRs) in 2023. SMRs can potentially be quicker to deploy and less expensive to build than traditional nuclear power plants because they are smaller, have factory based modular manufacturing and more flexible deployment options. In June 2025, Great British Energy - Nuclear announced that Rolls-Royce SMR had been selected as the preferred bidder to build the UK’s first SMRs, following a technology selection process that began in 2023.

Great British Energy - Nuclear is aiming to deliver fast, based on a supportive and collaborative culture which values equality and diversity and creates an inclusive workplace. We draw on deep nuclear expertise – our Executive Committee has over 100 years of nuclear experience at home and abroad. GBN-E will unlock billions of pounds of private and public investment from design to operation, helping to get sites ready for development, and working to grow manufacturing capacity and skills capability.

Our activities will be driven by our values, which are:

Trust - We prioritise safety, we act responsibly and with integrity.Collaboration - We work as a team; we value diversity and expertise.Challenge - We are curious and courageous in the way we think and act.Care - We are thoughtful, inclusive and respectful of others. Drive - We get things done and we make a difference.

If you have a disability and would prefer to apply in a different format or would like us to make reasonable adjustments to enable you to apply or attend an interview, please contact us at recruitment@greatbritishnuclear.uk and we will talk to you about how we can assist.

Role overview

Great British Energy – Nuclear (GBE‐N) is seeking a Business Architecture Modeller to strengthen our architecture capability and ensure we maintain a structured, coherent, governed view of the organisation’s as-is and to-be business landscape.

As part of the mobilisation team and architecture working group, you will collaborate with enterprise and domain architects, delivery teams and business stakeholders to develop and maintain architecture models and the associated model views and dashboards that support organisational decisions, solution design and delivery assurance. You will be responsible for keeping the enterprise architecture repository accurate and up to date, ensuring traceability from strategic goals and capabilities through to the business layer elements including processes, roles, systems, and information components. Modelling scope may range from the enterprise strategic level, looking across multiple organisations as is typical for a major UK infrastructure project, down to capability level architectures to enable controlled change of the organisational baseline as we move through the difference phases of the project.

This role suits an experienced business architecture practitioner who is highly structured, detail‐oriented and confident engaging a wide range of stakeholders. You will need to be comfortable working with and helping to refine our frameworks and guidelines (generally based on TOGAF/ArchiMate). You will be expected to expert in translating ambiguity into clear models, and will need to be able to operate in a regulated, security‐conscious environment and be an exemplar for good information management practices and controlled governance.

You will provide modelling expertise aligned to GBE‐N priorities, working flexibly under the direction of the Lead Business Architect. Work will be prioritised collaboratively and may evolve as organisational capabilities mature, new programmes initiate and delivery teams require architecture input and assurance.

Key responsibilities

You will be responsible for developing and maintaining business architecture models and artefacts according to agreed processes and standards. Additionally, you will be responsible for actively engaging with stakeholders to translate their understanding and decisions into models, and in turn using models to provide insights for stakeholders to inform decision-making. More specific responsibilities will include:

• Maintaining the architecture landscape, ensuring models are accurate, consistent, version‐controlled and aligned to agreed standards and modelling conventions
• Developing and update model views to address stakeholder concerns and support strategic planning and investment prioritisation, including business capability models, value streams and various operating model views
• Producing architecture viewpoints and packs for governance forums (e.g. Architecture Review Board), communicating complex information clearly for both technical and non‐technical audiences at all levels of seniority
• Working with solution and data architects and delivery teams to ensure solutions are explicitly traceable to business needs
• Supporting option assessment by modelling candidate architectures to show impacts, risks and trade‐offs
• Maintaining architecture plateaus, roadmaps, and heatmaps to enable planning and sequencing of change
• Translating information from project documentation (e.g. target operating model documents) and architecture models, and identifying issues regarding inconsistency or ambiguity
• Defining and enforcing modelling standards, meta‐model compliance and quality checks; coaching contributors to improve consistency and reuse across the repository
• Producing clear documentation (catalogues, diagrams, patterns, principles, rationale) and maintaining links between requirements, decisions, risks and architecture artefacts for auditability
• Identifying and documenting organisational requirements and constraints, and ensuring adherence to these in the model and in architectural decisions

Skills and experience

As a modeller, you will need to demonstrate excellent familiarity and experience with the following standards and tools, and be able to advise on best practice and implement models through their use:

• ArchiMate (essential)
• Bizzdesign (essential)
• TOGAF (essential)
• BIZBOK (desired)
• BPMN (desired)

More generally, you need to evidence the following capabilities:

• Excellent stakeholder engagement skills, able to organise workshops, elicit information, resolve inconsistencies and translate discussions into clear, usable models
• Demonstrable experience in business architecture modelling, business analysis or a related discipline, with significant hands‐on modelling in the ArchiMate business layer
• Strong working knowledge of enterprise architecture frameworks and methods (including TOGAF) and the ability to apply them pragmatically and advise on best practice implementation
• Experience using enterprise architecture tools/repositories (including Bizzdesign) and maintaining architecture repository quality
• Ability to develop and maintain value streams, capability maps, and structural and behavioural business views
• Working with existing documentation and engaging with stakeholders to map processes and capture relevant details in architecture and/or process models
• High attention to detail and disciplined approach to documentation, versioning and governance in a regulated and/or security‐conscious environment
• Strong written and visual communication skills, able to produce clear diagrams, viewpoints and narrative for a variety of stakeholders to support governance and delivery
• Ability to work collaboratively across teams and priorities, balancing thoroughness, pace and pragmatism in an evolving environment where requirements may change, while navigating potential ambiguity and uncertainty
• Eligible for BPSS clearance as a minimum; SC clearance (or willingness/eligibility to obtain) is desirable depending on assignment

Desirable attributes

• TOGAF certification (Practitioner or higher)
• ArchiMate certification
• Experience working in complex, regulated environments (e.g., energy, nuclear, defence, public sector) with strong governance and assurance needs
• Experience working in large scale enterprises, e.g. multinational companies, major infrastructure projects
• Experience working with and/or developing target operating models