Over the last decade, the Canada Border Services Agency (CBSA) has evolved its enterprise architecture program to the point that it is now seen as one of the most mature within the Government of Canada. The CBSA Architecture Program (CAP), grounded in TOGAF, is a business architecture driven program that encompasses all key architecture domains: Information/Data/Privacy, Applications, Technology and Security architecture domains. The CAP mandate is to provide modern architecture services to fully supports the Agency optimization and digital transformation agenda. As such, the CAP tracks societal and governmental innovations, develops related strategic architecture direction in alignment with GC direction and industry best practices, develops and maintains a CBSA digital twin (CBSA Reference Architecture) used to understand the CBSA architecture structure and assess transformational impact and, finally, assesses/guides the compliance of all transformational initiatives as they are being realised. The CAP also has its own governance mechanism up to the CBSA Architecture Review Board. The aim of this presentation is to expose how the CAP operates and support digital transformation.