This book constitutes the revised selected papers of the 19th Symposium and Summer School on Service-Oriented Computing, SummerSOC 2025, held in Crete, Greece, during June 16-21, 2025. The 8 full papers and 2 short papers were presented in this volume were carefully reviewed and selected from 25 submissions. They were categorized under these topical sections: The Digital World, Data Platforms, and Mixed Methods.