diff --git a/data/build.gradle.kts b/data/build.gradle.kts
index 9419295..e444f28 100644
--- a/data/build.gradle.kts
+++ b/data/build.gradle.kts
@@ -17,37 +17,15 @@ dependencies {
     // Android Core
     implementation(KotlinDependencies.kotlin)
     implementation(AndroidXDependencies.coreKtx)
-    implementation(AndroidXDependencies.appCompat)
-    implementation(AndroidXDependencies.constraintLayout)
     implementation(AndroidXDependencies.coroutines)
 
-    // Material Design
-    implementation(MaterialDesignDependencies.materialDesign)
-
     // Dagger-Hilt
     implementation(AndroidXDependencies.hilt)
     kapt(KaptDependencies.hiltCompiler)
 
-    // Jetpack Navigation Component
-    implementation(AndroidXDependencies.navigationFragment)
-    implementation(AndroidXDependencies.navigationUI)
-
     // Jetpack Security
     implementation(AndroidXDependencies.security)
 
-    // Jetpack Fragment
-    implementation(AndroidXDependencies.fragment)
-
-    // Jetpack Lifecycle
-    implementation(AndroidXDependencies.coroutines)
-    implementation(AndroidXDependencies.lifeCycleKtx)
-    implementation(AndroidXDependencies.lifecycleJava8)
-
-    // ImageLoading Library
-    // Glide for general
-    implementation(ThirdPartyDependencies.glide)
-    kapt(KaptDependencies.glideCompiler)
-
     // Http Client Library
     implementation(ThirdPartyDependencies.retrofit)
     implementation(platform(ThirdPartyDependencies.okHttpBom))
diff --git a/data/src/main/java/org/mascota/data/EmptyFile.kt b/data/src/main/java/org/mascota/data/EmptyFile.kt
deleted file mode 100644
index 00dcba1..0000000
--- a/data/src/main/java/org/mascota/data/EmptyFile.kt
+++ /dev/null
@@ -1,3 +0,0 @@
-package org.mascota.data
-
-class EmptyFile
diff --git a/data/src/main/java/org/mascota/data/di/LocalPreferencesModule.kt b/data/src/main/java/org/mascota/data/di/LocalPreferencesModule.kt
new file mode 100644
index 0000000..90c874b
--- /dev/null
+++ b/data/src/main/java/org/mascota/data/di/LocalPreferencesModule.kt
@@ -0,0 +1,19 @@
+package org.mascota.data.di
+
+import android.app.Application
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.android.qualifiers.ApplicationContext
+import dagger.hilt.components.SingletonComponent
+import javax.inject.Singleton
+import org.mascota.data.local.MascotaSharedPreferences
+
+@Module
+@InstallIn(SingletonComponent::class)
+object LocalPreferencesModule {
+    @Provides
+    @Singleton
+    fun providesLocalPreferences(@ApplicationContext context: Application) =
+        MascotaSharedPreferences(context)
+}
diff --git a/data/src/main/java/org/mascota/data/di/NetworkModule.kt b/data/src/main/java/org/mascota/data/di/NetworkModule.kt
new file mode 100644
index 0000000..188f4f2
--- /dev/null
+++ b/data/src/main/java/org/mascota/data/di/NetworkModule.kt
@@ -0,0 +1,60 @@
+package org.mascota.data.di
+
+import com.jakewharton.retrofit2.converter.kotlinx.serialization.asConverterFactory
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+import java.util.concurrent.TimeUnit
+import javax.inject.Singleton
+import kotlinx.serialization.ExperimentalSerializationApi
+import kotlinx.serialization.json.Json
+import okhttp3.MediaType.Companion.toMediaType
+import okhttp3.OkHttpClient
+import okhttp3.logging.HttpLoggingInterceptor
+import org.mascota.data.local.MascotaSharedPreferences
+import org.mascota.data.network.AuthInterceptor
+import retrofit2.Retrofit
+
+@InstallIn(SingletonComponent::class)
+@Module
+object NetworkModule {
+    @Provides
+    @Singleton
+    fun provideHttpLoggingInterceptor(): HttpLoggingInterceptor =
+        HttpLoggingInterceptor().apply {
+            level = HttpLoggingInterceptor.Level.BODY
+        }
+
+    @Provides
+    @Singleton
+    fun provideAuthInterceptor(preferences: MascotaSharedPreferences) =
+        AuthInterceptor(preferences)
+
+    @Provides
+    @Singleton
+    fun provideOkHttpClient(
+        httpLoggingInterceptor: HttpLoggingInterceptor,
+        authInterceptor: AuthInterceptor
+    ): OkHttpClient =
+        OkHttpClient.Builder()
+            .connectTimeout(1, TimeUnit.MINUTES)
+            .writeTimeout(30, TimeUnit.SECONDS)
+            .readTimeout(30, TimeUnit.SECONDS)
+            .addInterceptor(authInterceptor)
+            .addInterceptor(httpLoggingInterceptor)
+            .build()
+
+    @ExperimentalSerializationApi
+    @Provides
+    @Singleton
+    fun provideRetrofitObject(okHttpClient: OkHttpClient): Retrofit {
+        return Retrofit.Builder()
+            .baseUrl(MASCOTA_URL)
+            .client(okHttpClient)
+            .addConverterFactory(Json.asConverterFactory("application/json".toMediaType()))
+            .build()
+    }
+
+    private const val MASCOTA_URL = "https://mascota.kr/"
+}
diff --git a/data/src/main/java/org/mascota/data/local/MascotaSharedPreferences.kt b/data/src/main/java/org/mascota/data/local/MascotaSharedPreferences.kt
new file mode 100644
index 0000000..75b091c
--- /dev/null
+++ b/data/src/main/java/org/mascota/data/local/MascotaSharedPreferences.kt
@@ -0,0 +1,30 @@
+package org.mascota.data.local
+
+import android.content.Context
+import androidx.core.content.edit
+import androidx.databinding.ktx.BuildConfig
+import androidx.security.crypto.EncryptedSharedPreferences
+import androidx.security.crypto.MasterKeys
+import javax.inject.Inject
+
+class MascotaSharedPreferences @Inject constructor(
+    context: Context
+) {
+    private val preferences = if (!BuildConfig.DEBUG) EncryptedSharedPreferences.create(
+        FILE_NAME,
+        MasterKeys.getOrCreate(MasterKeys.AES256_GCM_SPEC),
+        context,
+        EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+        EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
+    ) else context.getSharedPreferences(DEBUG_FILE_NAME, Context.MODE_PRIVATE)
+
+    var userToken: String
+        set(value) = preferences.edit { putString(USER_TOKEN, value) }
+        get() = preferences.getString(USER_TOKEN, "") ?: ""
+
+    companion object {
+        private const val USER_TOKEN = "USER_TOKEN"
+        private const val FILE_NAME = "MASCOTAAUTH"
+        const val DEBUG_FILE_NAME = "MASCOTAAUTHDEBUG"
+    }
+}
diff --git a/data/src/main/java/org/mascota/data/network/AuthInterceptor.kt b/data/src/main/java/org/mascota/data/network/AuthInterceptor.kt
new file mode 100644
index 0000000..d64a405
--- /dev/null
+++ b/data/src/main/java/org/mascota/data/network/AuthInterceptor.kt
@@ -0,0 +1,20 @@
+package org.mascota.data.network
+
+import javax.inject.Inject
+import okhttp3.Interceptor
+import okhttp3.Response
+import org.mascota.data.local.MascotaSharedPreferences
+
+class AuthInterceptor @Inject constructor(private val preferences: MascotaSharedPreferences) :
+    Interceptor {
+
+    override fun intercept(chain: Interceptor.Chain): Response {
+        val requestBuilder = chain.request().newBuilder()
+
+        preferences.userToken.let {
+            requestBuilder.addHeader("x-access-token", it)
+        }
+
+        return chain.proceed(requestBuilder.build())
+    }
+}
diff --git a/gradle/common.gradle b/gradle/common.gradle
index 8e709b4..0e4aaa4 100644
--- a/gradle/common.gradle
+++ b/gradle/common.gradle
@@ -18,5 +18,8 @@ if (hasLibraryPlugin || hasApplicationPlugin) {
             sourceCompatibility = JavaVersion.VERSION_11
             targetCompatibility = JavaVersion.VERSION_11
         }
+        kotlinOptions {
+            jvmTarget = JavaVersion.VERSION_11
+        }
     }
 }