diff --git a/build.gradle.kts b/build.gradle.kts
index 40684e3..f206a8b 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,7 +1,13 @@
+object Versions {
+	const val springBoot = "3.4.3"
+	const val springDependencyManagement = "1.1.7"
+	const val kotlinJvm = "1.9.25"
+	const val kotlinPluginSpring = "1.9.25"
+}
+
 plugins {
 	kotlin("jvm") version "1.9.25"
 	kotlin("plugin.spring") version "1.9.25"
-	id("org.springframework.boot") version "3.4.4"
 	id("io.spring.dependency-management") version "1.1.7"
 }
 
@@ -19,18 +25,23 @@ repositories {
 }
 
 subprojects {
+	apply(plugin = "java")
+	apply(plugin = "org.jetbrains.kotlin.jvm")
+
 	repositories {
 		mavenCentral()
 	}
+
+	dependencies {
+		implementation(platform("org.springframework.boot:spring-boot-dependencies:${Versions.springBoot}"))
+	}
+
 }
 
-dependencies {
-	implementation("org.springframework.boot:spring-boot-starter-web")
-	implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
-	implementation("org.jetbrains.kotlin:kotlin-reflect")
-	testImplementation("org.springframework.boot:spring-boot-starter-test")
-	testImplementation("org.jetbrains.kotlin:kotlin-test-junit5")
-	testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+dependencyManagement {
+	imports {
+		mavenBom("org.springframework.boot:spring-boot-dependencies:${Versions.springBoot}")
+	}
 }
 
 kotlin {
diff --git a/demo-application/build.gradle.kts b/demo-application/build.gradle.kts
new file mode 100644
index 0000000..ec4910d
--- /dev/null
+++ b/demo-application/build.gradle.kts
@@ -0,0 +1,11 @@
+plugins {
+    kotlin("jvm")
+    id("io.spring.dependency-management") version "1.1.7"
+    id("java")
+}
+
+dependencies {
+    implementation(kotlin("stdlib"))
+    implementation(project(":demo-domain"))
+    implementation("org.springframework:spring-context")
+}
\ No newline at end of file
diff --git a/demo-application/src/main/kotlin/com/example/demo/application/product/ProductUseCases.kt b/demo-application/src/main/kotlin/com/example/demo/application/product/ProductUseCases.kt
new file mode 100644
index 0000000..c6fba53
--- /dev/null
+++ b/demo-application/src/main/kotlin/com/example/demo/application/product/ProductUseCases.kt
@@ -0,0 +1,8 @@
+package com.example.demo.application.product
+
+import org.springframework.stereotype.Service
+
+@Service
+class ProductUseCases {
+
+}
\ No newline at end of file
diff --git a/demo-domain/src/main/kotlin/com/example/demo/domain/product/port/ProductPort.kt b/demo-domain/src/main/kotlin/com/example/demo/domain/product/port/ProductPort.kt
index eedba77..e5f2e34 100644
--- a/demo-domain/src/main/kotlin/com/example/demo/domain/product/port/ProductPort.kt
+++ b/demo-domain/src/main/kotlin/com/example/demo/domain/product/port/ProductPort.kt
@@ -9,4 +9,6 @@ interface ProductPort {
     fun getAll(): List<Product>
 
     fun save(product: Product)
+
+    fun deleteById(id: UUID)
 }
\ No newline at end of file
diff --git a/demo-launcher/build.gradle.kts b/demo-launcher/build.gradle.kts
index 3633d28..cb7b30d 100644
--- a/demo-launcher/build.gradle.kts
+++ b/demo-launcher/build.gradle.kts
@@ -1,7 +1,7 @@
 plugins {
     kotlin("jvm")
-    id("org.springframework.boot")
-    id("io.spring.dependency-management")
+    id("org.springframework.boot") version "3.4.3"
+    id("io.spring.dependency-management") version "1.1.7"
     id("java")
 }
 
@@ -11,5 +11,5 @@ dependencies {
 }
 
 springBoot {
-    mainClass = "com.example.demo.launcher.ApplicationLauncher"
+    mainClass = "com.example.demo.launcher.ApplicationLauncherKt"
 }
diff --git a/demo-launcher/src/main/kotlin/com/example/demo/launcher/ApplicationLauncher.kt b/demo-launcher/src/main/kotlin/com/example/demo/launcher/ApplicationLauncher.kt
index b384f95..5a10054 100644
--- a/demo-launcher/src/main/kotlin/com/example/demo/launcher/ApplicationLauncher.kt
+++ b/demo-launcher/src/main/kotlin/com/example/demo/launcher/ApplicationLauncher.kt
@@ -4,7 +4,7 @@ import org.springframework.boot.autoconfigure.SpringBootApplication
 import org.springframework.boot.runApplication
 
 @SpringBootApplication
-class DemoApplication
+open class DemoApplication
 
 fun main(args: Array<String>) {
     runApplication<DemoApplication>(*args)
diff --git a/settings.gradle.kts b/settings.gradle.kts
index fb886fc..108a368 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -1,3 +1,4 @@
 rootProject.name = "demo"
 include(":demo-domain")
+include(":demo-application")
 include(":demo-launcher")
diff --git a/src/main/kotlin/com/example/demo/DemoApplication.kt b/src/main/kotlin/com/example/demo/DemoApplication.kt
deleted file mode 100644
index 7fd8c28..0000000
--- a/src/main/kotlin/com/example/demo/DemoApplication.kt
+++ /dev/null
@@ -1,11 +0,0 @@
-package com.example.demo
-
-import org.springframework.boot.autoconfigure.SpringBootApplication
-import org.springframework.boot.runApplication
-
-@SpringBootApplication
-class DemoApplication
-
-fun main(args: Array<String>) {
-	runApplication<DemoApplication>(*args)
-}
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
deleted file mode 100644
index 2109a44..0000000
--- a/src/main/resources/application.properties
+++ /dev/null
@@ -1 +0,0 @@
-spring.application.name=demo
diff --git a/src/test/kotlin/com/example/demo/DemoApplicationTests.kt b/src/test/kotlin/com/example/demo/DemoApplicationTests.kt
deleted file mode 100644
index 2388354..0000000
--- a/src/test/kotlin/com/example/demo/DemoApplicationTests.kt
+++ /dev/null
@@ -1,13 +0,0 @@
-package com.example.demo
-
-import org.junit.jupiter.api.Test
-import org.springframework.boot.test.context.SpringBootTest
-
-@SpringBootTest
-class DemoApplicationTests {
-
-	@Test
-	fun contextLoads() {
-	}
-
-}