diff --git a/src/controllers/__init__.py b/src/controllers/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/controllers/user_creator.py b/src/controllers/user_creator.py
new file mode 100644
index 0000000..d6cddeb
--- /dev/null
+++ b/src/controllers/user_creator.py
@@ -0,0 +1,28 @@
+from src.models.repositories.interfaces.users_repository import UsersRepositoryInterface
+
+class UserCreator:
+    def __init__(self, users_repository: UsersRepositoryInterface): # Inverção da dependência - D SOLID
+        self.__users_repo = users_repository
+
+    def insert_new_user(self, name: str, age: int, height: float) -> dict:
+        self.__check_if_user_exists(name)
+        self.__create_new_user(name, age, height)
+        return self.__format_response()
+    
+    def __check_if_user_exists(self, name: str) -> None:
+        select_users = self.__users_repo.select_user(name)
+        if (not select_users or len(select_users) == 0):
+            return
+        
+        raise Exception("User is not registered!")
+    
+    def __create_new_user(self, name: str, age: int, height: float) -> None:
+        #Others Activates necessary (optional)
+        self.__users_repo.insert_user(name, age, height)
+        
+    def __format_response(self) -> dict:
+        return {
+            "type": "Users",
+            "count": 1,
+            "message": "User is not registered!"
+        }
\ No newline at end of file
diff --git a/src/controllers/user_creator_test.py b/src/controllers/user_creator_test.py
new file mode 100644
index 0000000..c04b6fa
--- /dev/null
+++ b/src/controllers/user_creator_test.py
@@ -0,0 +1,49 @@
+import pytest
+from src.controllers.user_creator import UserCreator
+
+class UserRepositoryMock:
+    def __init__(self):
+        self.select_user_att = {}
+        self.insert_user_att = {}
+
+    def select_user(self, name: str) -> list:
+        self.select_user_att["name"] = name
+        return []
+
+    def insert_user(self, name: str, age: int, height: float) -> None:
+        self.insert_user_att["name"] = name
+        self.insert_user_att["age"] = age
+        self.insert_user_att["height"] = height
+
+
+class UserRepositoryMockWithError:
+    def __init__(self):
+        self.select_user_att = {}
+    
+    def select_user(self, name: str) -> list:
+        self.select_user_att["name"] = name
+        return [1, 2, 3]
+    
+def test_insert_new_user():
+    user_repository = UserRepositoryMock()
+    user_creator = UserCreator(user_repository)
+
+    name = "My name"
+    age = 42
+    height = 1.80
+
+    response = user_creator.insert_new_user(name, age, height)
+
+    assert isinstance(response, dict)
+    assert "type" in response
+    assert response["count"] == 1
+    assert response["message"] == "User is not registered!"
+
+def test_insert_new_user_with_error():
+    user_repository = UserRepositoryMockWithError()
+    user_creator = UserCreator(user_repository)
+    
+    with pytest.raises(Exception) as exc_info:
+        user_creator.insert_new_user("something", 42, 1.11)
+    assert str(exc_info.value) == "User is not registered!"
+        
\ No newline at end of file
diff --git a/src/controllers/user_finder.py b/src/controllers/user_finder.py
new file mode 100644
index 0000000..4d0a9cd
--- /dev/null
+++ b/src/controllers/user_finder.py
@@ -0,0 +1,32 @@
+from src.models.repositories.interfaces.users_repository import UsersRepositoryInterface
+
+class UserFinder:
+    def __init__(self, users_repository: UsersRepositoryInterface):
+        self.__users_repo = users_repository
+        
+    def find_by_name(self, name:str) -> dict:
+        select_users = self.__select_and_validate_user(name)
+        return self.__format_response(select_users)
+    def __select_and_validate_user(self, name: str) -> list:
+        select_users = self.__users_repo.select_user(name)
+        if (not select_users or len(select_users) == 0):
+            raise Exception("User is not registered!")
+        
+        return select_users
+    
+    def __format_response(self, select_users: list) -> dict:
+        formatted_users = []
+        for user in select_users:
+            formatted_users.append({
+                "id": user.id,
+                "name": user.name,
+                "age": user.age,
+                "height": user.height
+            })
+            
+        return {
+            "type": "Users",
+            "count": len(formatted_users),
+            "attributes": formatted_users
+        }
+                                
\ No newline at end of file
diff --git a/src/controllers/user_finder_test.py b/src/controllers/user_finder_test.py
new file mode 100644
index 0000000..facce41
--- /dev/null
+++ b/src/controllers/user_finder_test.py
@@ -0,0 +1,51 @@
+import pytest
+from src.models.entities.users import Users
+from .user_finder import UserFinder
+
+class UserRepositoryMock:
+    def __init__(self):
+        self.select_user_att = {}
+
+    def select_user(self, name: str) -> list:
+        self.select_user_att["name"] = name
+        return [
+            Users(
+                id=123,
+                name="tatu",
+                age=42,
+                height=3.20   
+            )
+        ]
+
+class UserRepositoryMockWithError:
+    def __init__(self):
+        self.select_user_att = {}
+    
+    def select_user(self, name: str) -> list:
+        self.select_user_att["name"] = name
+        return[]
+
+def test_find_by_name():
+    name = "my_papa_name"
+    user_repo = UserRepositoryMock()
+    user_finder = UserFinder(user_repo)
+    
+    response = user_finder.find_by_name(name)
+    print(response)
+    print(user_repo.select_user_att)
+    
+    assert user_repo.select_user_att["name"] == name
+    assert isinstance(response, dict)
+    assert response["type"] == "Users"
+    assert "attributes" in response
+    assert isinstance(response["attributes"], list)
+    
+def test_find_by_name_with_error():
+    user_repo = UserRepositoryMockWithError()
+    user_finder = UserFinder(user_repo)
+    
+    with pytest.raises(Exception) as exc_info:
+        user_finder.find_by_name("something")
+        
+    assert str(exc_info.value) == "User is not registered!"
+    
\ No newline at end of file
diff --git a/src/models/repositories/interfaces/__init__.py b/src/models/repositories/interfaces/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/models/repositories/interfaces/users_repository.py b/src/models/repositories/interfaces/users_repository.py
new file mode 100644
index 0000000..7ef6e84
--- /dev/null
+++ b/src/models/repositories/interfaces/users_repository.py
@@ -0,0 +1,12 @@
+from abc import ABC, abstractmethod
+from src.models.entities.users import Users
+
+class UsersRepositoryInterface:
+    
+    @abstractmethod
+    def insert_user(self, name: str, age: int, height: float) -> None:
+        pass
+    @abstractmethod
+    def select_user(self, name: str) -> list[Users]:
+        pass
+    
\ No newline at end of file
diff --git a/src/models/repositories/users_repository.py b/src/models/repositories/users_repository.py
index 1e97646..f18bcf8 100644
--- a/src/models/repositories/users_repository.py
+++ b/src/models/repositories/users_repository.py
@@ -1,6 +1,8 @@
 from src.models.connection.db_connection_handler import DbConnectionHandler
 from src.models.entities.users import Users
-class UsersRepository:
+from .interfaces.users_repository import UsersRepositoryInterface
+
+class UsersRepository(UsersRepositoryInterface):
     def __init__(self, db_conn_handler: DbConnectionHandler):
         self.__db_conn_handler = db_conn_handler