diff --git a/be/app/Console/Commands/SyncUsersFromKarat.php b/be/app/Console/Commands/SyncUsersFromKarat.php
index c1aa39e..72795fe 100644
--- a/be/app/Console/Commands/SyncUsersFromKarat.php
+++ b/be/app/Console/Commands/SyncUsersFromKarat.php
@@ -31,8 +31,7 @@ class SyncUsersFromKarat extends Command
     {
         $karatService = new KaratService();
 
-        dd($karatService->syncUsers());
-
+        $karatService->syncUsers();
 
         return Command::SUCCESS;
     }
diff --git a/be/app/Models/User.php b/be/app/Models/User.php
index 8640624..0e17462 100644
--- a/be/app/Models/User.php
+++ b/be/app/Models/User.php
@@ -22,6 +22,8 @@ class User extends Authenticatable
         'password',
     ];
 
+    protected $guarded = ['id'];
+
     /**
      * The attributes that should be hidden for serialization.
      *
diff --git a/be/app/Services/Karat/Api.php b/be/app/Services/Karat/Api.php
index f2ce08f..68c8187 100644
--- a/be/app/Services/Karat/Api.php
+++ b/be/app/Services/Karat/Api.php
@@ -10,38 +10,38 @@ class Api
     /**
      * @var array|mixed
      */
-    private mixed $username;
+    private static mixed $username;
     /**
      * @var array|mixed
      */
-    private mixed $password;
+    private static mixed $password;
     /**
      * @var array|mixed
      */
-    private mixed $endpoint;
+    private static mixed $endpoint;
 
     public function __construct()
     {
-        $this->username = Config::get('services.karat.username');
-        $this->password = Config::get('services.karat.password');
-        $this->endpoint = Config::get('services.karat.endpoint');
+        self::$username = Config::get('services.karat.username');
+        self::$password = Config::get('services.karat.password');
+        self::$endpoint = Config::get('services.karat.endpoint');
     }
 
-    private function doRequest($command)
+    private static function doRequest($command)
     {
         $response = Http::withOptions([
             'debug' => true,
             'verify' => false,
-        ])->withBasicAuth($this->username, $this->password)
-          ->post($this->endpoint, [
+        ])->withBasicAuth(self::$username, self::$password)
+          ->post(self::$endpoint, [
             'command' => $command,
         ]);
 
         return $response->json();
     }
 
-    public function getUsers()
+    public static function getUsers()
     {
-        return $this->doRequest('TM_GET_USERS');
+        return self::doRequest('TM_GET_USERS')['users'];
     }
 }
diff --git a/be/app/Services/Karat/KaratService.php b/be/app/Services/Karat/KaratService.php
index 6baf116..7bf9fb6 100644
--- a/be/app/Services/Karat/KaratService.php
+++ b/be/app/Services/Karat/KaratService.php
@@ -2,6 +2,10 @@
 
 namespace App\Services\Karat;
 
+use App\Models\User;
+use Illuminate\Support\Arr;
+use Illuminate\Support\Collection;
+
 class KaratService
 {
     private Api $api;
@@ -13,11 +17,35 @@ class KaratService
 
     public function syncUsers()
     {
-        $users = $this->api->getUsers();
-        
-        dd($users);
+        $karatUsers = \App\Services\Karat\User::all();
+        $dbUsers =  User::all();
+
+        $this->insertUsersFromKarat($karatUsers, $dbUsers);
+
+        $this->removeUsersThatAreNotInKaratAnymore($karatUsers, $dbUsers);
+    }
+
+    private function insertUsersFromKarat(Collection $karatUsers, Collection $dbUsers)
+    {
+        $emailsToSkip = $dbUsers->pluck('email' )->intersect( $karatUsers->pluck('email'));
+
+        $karatUsersToInsert = $karatUsers->reject(function ($item) use ($emailsToSkip) {
+            return $emailsToSkip->contains($item->email);
+        })->map(function ($item) {
+            $array = $item->toArray();
+
+            return $array;
+        });
+
+        User::insert($karatUsersToInsert->toArray());
+    }
+
+    private function removeUsersThatAreNotInKaratAnymore( Collection $karatUsers, Collection $dbUsers )
+    {
+        $emailsInDbThatAreNotInKaratAnymore = $dbUsers->pluck('email' )->diff( $karatUsers->pluck('email'));
+
+        User::whereIn('email', $emailsInDbThatAreNotInKaratAnymore)->delete();
 
-        return $users;
     }
 
 
diff --git a/be/app/Services/Karat/User.php b/be/app/Services/Karat/User.php
new file mode 100644
index 0000000..b02abc1
--- /dev/null
+++ b/be/app/Services/Karat/User.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Services\Karat;
+
+class User extends Api {
+    public $code;
+    public $firstname;
+    public $lastname;
+    public $email;
+
+    public function __construct($code, $firstname, $lastname, $email) {
+        $this->code = $code;
+        $this->firstname = $firstname;
+        $this->lastname = $lastname;
+        $this->email = $email;
+    }
+
+    public static function all() {
+        $users = self::getUsers();
+
+        return collect(array_map(function($user) {
+            return new User( $user['id'], $user['name'], $user['surname'], $user['email'] );
+        }, $users))->reject(function ($item) {
+            // return only if email is not null
+            return $item->email === '';
+        });
+    }
+
+    public function toArray() {
+        return [
+            'code' => $this->code,
+            'firstname' => $this->firstname,
+            'lastname' => $this->lastname,
+            'email' => $this->email,
+        ];
+    }
+
+}
diff --git a/be/database/migrations/2023_02_25_160300_add_default_values_to_users_table.php b/be/database/migrations/2023_02_25_160300_add_default_values_to_users_table.php
new file mode 100644
index 0000000..86f9639
--- /dev/null
+++ b/be/database/migrations/2023_02_25_160300_add_default_values_to_users_table.php
@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->float('work_start', 3, 1)->default(9.0)->change();
+            $table->float('work_end', 3, 1)->default(17.0)->change();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('users', function (Blueprint $table) {
+            //
+        });
+    }
+};
diff --git a/be/database/migrations/2023_02_25_161605_allow_null_password_for_users.php b/be/database/migrations/2023_02_25_161605_allow_null_password_for_users.php
new file mode 100644
index 0000000..6df0a8c
--- /dev/null
+++ b/be/database/migrations/2023_02_25_161605_allow_null_password_for_users.php
@@ -0,0 +1,30 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->string('password')->nullable()->change();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        //
+    }
+};