Senior Integration Architect

Senior Integration Architect | Public Sector Transformation Programme

Location: Remote with occasional/ad hoc travel to client sites as required Contract: Initial 6-month contract with strong extension potential Rate: Up to £700 per day (Inside IR35) Clearance: BPSS Required

The Opportunity

We are supporting a major public sector transformation programme focused on modernising and simplifying a large-scale enterprise integration landscape. This multi-year initiative is driving the migration from legacy technologies to strategic platforms, enabling the successful transition to modern cloud-based architecture and supporting wider digital transformation objectives.

As a Senior Integration Architect, you will play a key role in designing and delivering integration solutions within a large-scale migration programme. Working closely with architecture, engineering, and product teams, you will help shape the future integration strategy while ensuring high-quality, scalable, and maintainable solutions are delivered across the programme.

Key Responsibilities

Design and deliver integration solutions, migrating services from legacy platforms to modern strategic integration platforms. Define API specifications and integration patterns, including the transformation of legacy SOAP services into modern RESTful APIs. Apply API-first and domain-driven integration approaches to support reuse, resilience, and long-term maintainability. Contribute to end-to-end solution design, ensuring alignment with wider enterprise architecture principles and transformation objectives. Promote modern engineering practices including automated testing, CI/CD, shift-left delivery, and automation. Support the identification and management of technical risks, dependencies, and migration planning activities. Collaborate closely with engineering teams, product owners, business stakeholders, and SMEs to ensure successful delivery. Contribute to architecture governance, technical documentation, and design assurance activities.Essential Skills & Experience

Extensive experience in enterprise integration architecture and delivery within large-scale transformation or migration programmes. Strong expertise in API design, REST services, OpenAPI specifications, and modern integration patterns. Experience designing and implementing service-based and distributed architectures. Working knowledge of enterprise integration platforms such as SAP Integration Suite, API Management platforms, or similar technologies. Experience delivering integration migration or modernisation programmes. Strong understanding of modern software engineering practices, including CI/CD pipelines, automated testing, and observability. Experience working across multiple delivery teams and contributing to broader architectural strategy and governance. Excellent stakeholder management and communication skills, with the ability to engage both technical and non-technical audiences.Desirable Experience

Experience within central government or wider public sector environments. Exposure to large-scale ERP transformation programmes. Experience supporting cloud-based integration strategies and platform modernisation initiatives. Knowledge of AI-assisted delivery approaches, including code analysis, automation, and documentation generation. Familiarity with strategic integration platforms and API management solutions