Anchored in the domain of migrant integration, the article reflects cross-national ICT development for public services. It reports about MICADO, a digital platform bringing together business intelligence, data analytics and visualisation in support of migrant integration management in EU cities. Resulting from a Horizon2020 innovation action, the solution targets public authorities, civil society organisations, and migrants, by providing information access, data exchange, and navigation across institutions. The paper examines challenges of embedding a new platform in the administation and data environments of cities and discusses the complexities of a solution aiming to address multiple target groups in multiple application areas. The text illustrates how MICADO created solutions responsive to local specificities while securing sustainability and institutional uptake. Finally, MICADO is discussed as a potential conceptual blueprint for similar challenges in the European public sector.