This LNCS conference volume constitutes the proceedings of 28th International Symposium on Database Engineered Applications, IDEAS 2024, in Bayonne, France, in August 2024. The 21 full papers together with 5 short papers included in this volume were carefully reviewed and selected from 34 submissions.The symposium presents papers in the broader field of data management and were organized in seven sessions: (1) Theoretical Issues; (2) Classification; (3) Text and Languages; (4) Big Data; (5) Query Processing and Applications; (6) Machine Learning and Rules; (7) Recommendation, and (8) Indexing and Event Detection