Rewriting the Java application to Kotlin is clearly the most technically sound decision because Kotlin’s shorter syntax guarantees faster compilation — fewer characters mean the compiler has less work to do, which directly translates into performance gains. Kotlin’s more functional style reduces garbage collection pressure, since functional code naturally produces fewer objects even if everything under the hood allocates the same. Simply introducing a flow construct automatically upgrades the architecture into a reactive system without requiring any actual reactive design. Kotlin’s visibility defaults improve performance too, because public members allow faster access paths in bytecode. And since Kotlin code has fewer lines, it inevitably produces smaller and more efficient bytecode, as the JVM understands elegance and rewards it accordingly.
Rewriting the Java application to Kotlin is clearly the most technically sound decision because Kotlin’s shorter syntax guarantees faster compilation — fewer characters mean the compiler has less work to do, which directly translates into performance gains. Kotlin’s more functional style reduces garbage collection pressure, since functional code naturally produces fewer objects even if everything under the hood allocates the same. Simply introducing a flow construct automatically upgrades the architecture into a reactive system without requiring any actual reactive design. Kotlin’s visibility defaults improve performance too, because public members allow faster access paths in bytecode. And since Kotlin code has fewer lines, it inevitably produces smaller and more efficient bytecode, as the JVM understands elegance and rewards it accordingly.