diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem.vcxproj b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem.vcxproj
index a65c46d..1b76c8a 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem.vcxproj
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem.vcxproj
@@ -171,6 +171,7 @@
     <ClInclude Include="services\PaymentManagementService.h" />
     <ClInclude Include="services\ServiceManagementService.h" />
     <ClInclude Include="services\UserManagementService.h" />
+    <ClInclude Include="utilities\Config.h" />
     <ClInclude Include="utilities\Enums.h" />
     <ClInclude Include="utilities\InputHelper.h" />
     <ClInclude Include="utilities\Map.h" />
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp
index d536e8a..e641900 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.cpp
@@ -2,7 +2,7 @@
 
 bool Controller::login(const std::string& username, const std::string& password)
 {
-    return false;
+    return m_authenticationManagementService.login(username, password);
 }
 
 void Controller::logout()
@@ -19,7 +19,7 @@ void Controller::createCustomer(const std::string& username, const std::string&
 
 const User* Controller::getAuthenticatedUser()
 {
-    return nullptr;
+    return m_authenticationManagementService.getAuthenticatedUser();
 }
 
 void Controller::createTechnician(const std::string& username, const std::string& password, const std::string& email, const std::string& phone)
@@ -143,5 +143,6 @@ void Controller::configureNotifications(const std::string& userID, bool paymentN
 
 void Controller::runSystemChecks()
 {
+    m_userManagementService.ensureAdminExists();
 }
 
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.h
index 3aabb58..e1ecc49 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/controllers/Controller.h
@@ -2,6 +2,8 @@
 #include "Map.h"
 #include <string>
 #include "Enums.h"
+#include "AuthenticationManagementService.h"
+#include "UserManagementService.h"
 
 class Service;
 class ComboPackage;
@@ -14,6 +16,9 @@ class Notification;
 
 class Controller
 {
+private:
+    AuthenticationManagementService m_authenticationManagementService;
+    UserManagementService m_userManagementService;
 public:
     bool login(const std::string& username, const std::string& password);
     void logout();
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/AuthenticationManagementService.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/AuthenticationManagementService.cpp
index ca07fee..91dd003 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/AuthenticationManagementService.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/AuthenticationManagementService.cpp
@@ -1,3 +1,29 @@
 #include "AuthenticationManagementService.h"
+#include "User.h"
 
 User* AuthenticationManagementService::m_authenticatedUser = nullptr;
+
+bool AuthenticationManagementService::login(const std::string& username, const std::string& password)
+{
+	util::Map<std::string, User*> users = m_dataStore.getUsers();
+	int usersMapSize = users.getSize();
+	for (int index = 0; index < usersMapSize; index++)
+	{
+		User* user = users.getValueAt(index);
+		if (username == user->getUserName())
+		{
+			if (password == user->getPassword())
+			{
+				m_authenticatedUser = user;
+				return true;
+			}
+			return false;
+		}
+	}
+	return false;
+}
+
+User* AuthenticationManagementService::getAuthenticatedUser()
+{
+	return m_authenticatedUser;
+}
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.cpp
index 2a5bd9e..2c2e156 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.cpp
@@ -1 +1,30 @@
 #include "UserManagementService.h"
+#include "User.h"
+#include "Enums.h"
+#include "Config.h"
+
+void UserManagementService::ensureAdminExists()
+{
+	auto& usersMap = m_dataStore.getUsers();
+	int usersMapSize = usersMap.getSize();
+	bool isAdminFound = false;
+	for (int index = 0; index < usersMapSize; index++)
+	{
+		User* user = usersMap.getValueAt(index);
+		if (user && user->getUserType() == util::UserType::ADMIN)
+		{
+			isAdminFound = true;
+			break;
+		}
+	}
+	if (!isAdminFound)
+	{
+		createUser(
+			config::admin::DEFAULT_ADMIN_USERNAME,
+			config::admin::DEFAULT_ADMIN_NAME,
+			config::admin::DEFAULT_ADMIN_PASSWORD,
+			config::admin::DEFAULT_ADMIN_EMAIL,
+			config::admin::DEFAULT_ADMIN_PHONE, 
+			util::UserType::ADMIN);
+	}
+}
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.h
index bb7a85a..34603a4 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/services/UserManagementService.h
@@ -13,7 +13,7 @@ private:
     DataStore& m_dataStore;
 public:
     UserManagementService() : m_dataStore(DataStore::getInstance()) {}
-    void createUser(const std::string& username, const std::string& password, const std::string& email, const std::string& phone, util::UserType type);
+    void createUser(const std::string& username, const std::string& name, const std::string& password, const std::string& email, const std::string& phone, util::UserType type);
     void updateUserDetails(const std::string& userID, const std::string& email, const std::string& phone);
     util::Map<std::string, User*> getUsers();
     util::Map<std::string, User*> getUsers(util::UserType type);
@@ -21,4 +21,5 @@ public:
     void removeUser(const std::string& userID);
     util::Vector<Notification*> getUserNotifications(const std::string& userID);
     void deleteNotification(const std::string& notificationID, const std::string& userID);
+    void ensureAdminExists();
 };
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/Config.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/Config.h
new file mode 100644
index 0000000..38c7bed
--- /dev/null
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/utilities/Config.h
@@ -0,0 +1,13 @@
+#pragma once
+
+namespace config
+{
+	namespace admin
+	{
+		constexpr const char* DEFAULT_ADMIN_USERNAME = "admin";
+		constexpr const char* DEFAULT_ADMIN_NAME = "admin";
+		constexpr const char* DEFAULT_ADMIN_PASSWORD = "";
+		constexpr const char* DEFAULT_ADMIN_EMAIL = "admin@vss";
+		constexpr const char* DEFAULT_ADMIN_PHONE = "0000000000";
+	}
+}
diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/UserInterface.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/UserInterface.cpp
index 122f9a8..b03defd 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/UserInterface.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/views/UserInterface.cpp
@@ -1,6 +1,8 @@
 #include "UserInterface.h"
 #include "InputHelper.h"
 #include "OutputHelper.h"
+#include "Enums.h"
+#include "User.h"
 
 void UserInterface::run()
 {
@@ -48,7 +50,38 @@ bool UserInterface::handleOperation(int choice)
 
 void UserInterface::login()
 {
-
+	std::string username, password;
+	util::clear();
+	std::cout << "Enter username: ";
+	util::read(username);
+	std::cout << "Enter password: ";
+	util::read(password);
+	if (m_controller.login(username, password))
+	{
+		const User* authenticatedUser = m_controller.getAuthenticatedUser();
+		if (authenticatedUser != nullptr)
+		{
+			switch (authenticatedUser->getUserType())
+			{
+			case util::UserType::ADMIN:
+				m_adminMenu.showMenu();
+				break;
+			case util::UserType::TECHNICIAN:
+				m_technicianMenu.showMenu();
+				break;
+			case util::UserType::CUSTOMER:
+				m_customerMenu.showMenu();
+				break;
+			default:
+				std::cout << "\nError: Unknown user type";
+				break;
+			}
+		}
+	}
+	else
+	{
+		std::cout << "\nError: Invalid Username or Password";
+	}
 }
 
 void UserInterface::registerCustomer()