diff --git a/bob_party/src/screens/services/userServices/ILoaderUser.ts b/bob_party/src/screens/services/userServices/ILoaderUser.ts
new file mode 100644
index 0000000..034c2eb
--- /dev/null
+++ b/bob_party/src/screens/services/userServices/ILoaderUser.ts
@@ -0,0 +1,8 @@
+import { User } from "../../../core/User/user";
+
+export default interface ILoaderUser{
+
+    loadByID(id:string): User | null;
+    loadByUsername(username:string): User | null;
+    loadByUsernamePassword(username:string, password:string): User | null;
+}
\ No newline at end of file
diff --git a/bob_party/src/screens/services/userServices/ISaverUser.ts b/bob_party/src/screens/services/userServices/ISaverUser.ts
new file mode 100644
index 0000000..08c5088
--- /dev/null
+++ b/bob_party/src/screens/services/userServices/ISaverUser.ts
@@ -0,0 +1,7 @@
+import { User } from "../../../core/User/user";
+
+export default interface ISaverUser{
+
+    saveUser(u:User): void;
+    deleteUser(u:User):void;
+}
\ No newline at end of file