Firdaus, E.A., Manurung, J., Saragih, H. and Prabukusumo, M.A. 2025. Optimization of XGBoost hyperparameters using grid search and random search for credit card default prediction. Jurnal Mandiri IT. 14, 2 (Oct. 2025), 269–280. DOI:https://doi.org/10.35335/mandiri.v14i2.468.