This paper presents corporate digital infrastructure design principles of companies in the financial services industry dealing with data intensive service offerings. The design principles emerged by applying established techniques of the grounded theory method from data we collected in a one case B2B organization which transformed its IT infrastructure. We structured the company’s initial problem and identified associated problem requirements and mapping solution components. Based on this case-based design theory building work, we theorized the following design principles: (1) a bidirectional data exchange to enable for customer data integration, (2) the usage of a flexible data model for the data storage, (3) efficient data processing by reduced communication overhead, and (4) small reusable and modular software components enabling standardized, yet flexible customer solutions. Our research contribution is twofold: First we contribute to the emerging literature stream of digital infrastructures. In particular, we shed light on design choices to transform a historically grown IT infrastructure to align with the generative evolution of non-corporate digital infrastructures. Second, we link the findings to literature of co-creation by reflecting our design principles to the layers of IT-value co-creation and reveal interdependencies among these layers.