Thanks to the rapid advancement in technology, especially for the systems having high temperatures and high heat fluxes, the interest in studies on impingement jets to improve the cooling efficiency increased in recent years. The current study focuses on determining the optimization of the inclined multijet array to reduce the temperature of electronic devices. In this study, the cooling was performed on the inclined surfaces by making use of impingement multijets via heat sinks consisting of rectangular fins modeled in different geometries and optimum cooling conditions were achieved. In achieving the optimum cooling conditions, the Taguchi method was used since it was thought to offer a reduction in time and costs in industrial applications. In this study, 11 different parameters were examined at three different levels in order to determine the optimum conditions for impingement multijet applications. The Nusselt number was set as the performance characteristic and the L₂₇(3¹¹) orthogonal sequence was used as the experiment plan for 11 parameters that were determined. When calculating the Nusselt number by using nozzle diameter, the optimum results were achieved using the following parameters: 40 mm of nozzle diameter, 9 m/s of air velocity, 20 mm of vertical distance between slices, 4444 W/m² of heat flux, 20 mm of vertical distance between fins, 15 mm of fin width, 30° of fin angle, 15 mm of horizontal distance between slices, 10° of heat sink angle, 20 mm of horizontal distance between fins, and 8 of nozzle diameter/heat sink dimensionless distance ratio. The flat plate and optimum heat sink established using the data obtained were compared under the optimum conditions obtained from the analysis and to the optimum conditions obtained using the finned optimum heat sink and it was determined that, under the optimum conditions, the finned heat sink improved the heat transfer by 28.61% when compared to the flat plate.