> Markdown version of [/jobs/ext/2425639-principal-architecture-assurance-lead-it-ot](https://www.wearedevelopers.com/jobs/ext/2425639-principal-architecture-assurance-lead-it-ot). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Principal Architecture Assurance Lead (IT & OT) - **Company:** NTT DATA UK Ltd. - **Location:** London, UK - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Working Model 2D, Technical Debt, Togaf - **Published:** August 3, 2026 - **Apply:** https://uk.indeed.com/viewjob?jk=92f56545396f16a6 ## About the Role * 20-30 years' experience in Enterprise / Solution Architecture and Assurance * Proven experience leading architecture assurance across large transformation programmes * Deep experience in regulated environments (e.g. utilities, energy, infrastructure) * Demonstrated ability to operate across both IT and Operational Technology landscapes Capabilities * Strong authority in: + Enterprise Architecture governance (TOGAF or equivalent) + Architecture assurance frameworks and methodologies + IT/OT convergence and integration + Cyber and resilience-by-design principles * Ability to operate credibly at CxO and Chief Architect level * Strong stakeholder management with the confidence to challenge and influence senior leaders Leadership Style * Decisive, opinionated, and able to set direction clearly and consistently * Pragmatic and delivery-focused - not overly bureaucratic * Comfortable operating in ambiguity and high-pressure environments Working Model * Based primarily across Glasgow, Perth and Aberdeen, with willingness to travel extensively * Long-term engagement (multi-year), providing continuity and stability of assurance leadership * Embedded within the customer environment but operating with clear independence from delivery teams Success Outcomes * Consistent, high-quality architecture across all programmes * Reduced risk, duplication, and technical debt * Strong alignment to standards, security, and policy * Improved delivery speed through clearer direction and reduced rework * A trusted, authoritative assurance function embedded within SSEN We offer a range of tailored benefits that support your physical, emotional, and financial wellbeing. Our Learning and Development team ensure that there are continuous growth and development opportunities for our people. We also offer the opportunity to have flexible work options., We are seeking a highly experienced, "heavyweight" Architecture Assurance leader (20-30 years' experience) to establish and lead a robust, independent assurance capability across a large-scale transformation portfolio within SSEN. ## Description * Lead the architectural assurance of a large, complex transformation portfolio (30-50 projects) * Oversee end-to-end assurance lifecycle, from early design through to delivery * Maintain a "dip in / dip out" model, typically investing ~10% time per project * Provide cross-project visibility to identify systemic risks, duplication, and misalignment Team Leadership & Capability * Lead and mentor a team of 2-3 senior architecture assurance consultants * Set the tone for strong, independent challenge and technical authority * Ensure consistent application of assurance methods, tools, and quality standards Standards, Governance & Control * Define and enforce clear architectural guardrails, reference architectures, and standards * Drive uniformity and consistency across all projects, reducing fragmentation * Actively participate in and shape governance forums (e.g. TDA / ARB equivalents) * Ensure alignment to enterprise policy, security requirements, and regulatory expectations Independent Challenge & Risk Management * Provide independent, objective assurance separate from delivery pressures * Identify and escalate architectural risks, gaps, and non-compliance * Challenge design decisions where required, even at senior stakeholder level * Act as a protector of the estate, prioritising long-term resilience over short-term delivery IT / OT Integration & Assurance * Operate across both IT and OT domains, ensuring cohesive architecture * Drive convergence where appropriate, reducing silos and conflicting decisions * Ensure solutions are secure, resilient, and fit for critical national infrastructure Driving Better Delivery Behaviour * "Force the conversation" with operational stakeholders to ensure real-world viability * Encourage simplification, pragmatism, and agility in solution design * Free up delivery teams by removing ambiguity and providing clear direction * Promote a culture of nimble, outcome-focused engineering rather than bureaucratic governance, We are an equal opportunities employer. We believe in the fair treatment of all our employees and commit to promoting equity and diversity in our employment practices. We are committed to creating a diverse and inclusive workforce. We actively collaborate with individuals who have disabilities and long-term health conditions which have an effect on their ability to do normal daily activities, ensuring that barriers are eliminated when it comes to employment opportunities. In line with our commitment, we guarantee an interview to applicants who declare to us, during the application process, that they have a disability and meet the minimum requirements for the role. If you require any reasonable adjustments during the recruitment process, please let us know. Join us in building a truly diverse and empowered team.