diff --git a/src/Backend/Controllers/AboutController.cs b/src/Backend/Controllers/AboutController.cs
index fc0a4fc..d1f9069 100644
--- a/src/Backend/Controllers/AboutController.cs
+++ b/src/Backend/Controllers/AboutController.cs
@@ -19,5 +19,12 @@ public string Get()
         {
             return _localizer["About Title"];
         }
+
+        [HttpGet("GetResource")]
+        public IActionResult GetResource()
+        {
+            //error 404 not found
+            return NotFound(_localizer["Resource not found"].Value);
+        }
     }
 }
\ No newline at end of file
diff --git a/src/Backend/Controllers/UserController.cs b/src/Backend/Controllers/UserController.cs
new file mode 100644
index 0000000..4dfd634
--- /dev/null
+++ b/src/Backend/Controllers/UserController.cs
@@ -0,0 +1,22 @@
+using Backend.Models;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Backend.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class UserController : ControllerBase
+    {
+        [HttpPost]
+        public IActionResult Post([FromBody] User user)
+        {
+            if (!ModelState.IsValid)
+            {
+                return BadRequest(ModelState);
+            }
+
+            return Ok();
+        }
+    }
+}
diff --git a/src/Backend/Models/User.cs b/src/Backend/Models/User.cs
new file mode 100644
index 0000000..2a26003
--- /dev/null
+++ b/src/Backend/Models/User.cs
@@ -0,0 +1,15 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Backend.Models
+{
+    public class User
+    {
+        [Required(ErrorMessage = "The Name field is required.")]
+        [StringLength(50, ErrorMessage = "The Name field cannot be more than 50 characters.")]
+        public string Name { get; set; }
+
+        [Required(ErrorMessage = "The Email field is required.")]
+        [EmailAddress(ErrorMessage = "The Email field does not have a valid format.")]
+        public string Email { get; set; }
+    }
+}
diff --git a/src/Backend/Program.cs b/src/Backend/Program.cs
index 17e1af8..4c7f692 100644
--- a/src/Backend/Program.cs
+++ b/src/Backend/Program.cs
@@ -1,3 +1,4 @@
+using Backend;
 using Microsoft.AspNetCore.Localization;
 using Microsoft.AspNetCore.Localization.Routing;
 
@@ -5,7 +6,12 @@
 
 // Add services to the container.
 
-builder.Services.AddControllers();
+builder.Services.AddControllers()
+    .AddDataAnnotationsLocalization(options => {
+        options.DataAnnotationLocalizerProvider = (type, factory) =>
+            factory.Create(typeof(SharedResource));
+    });
+
 // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
@@ -21,11 +27,11 @@
             .AddSupportedUICultures(SupportedCultures)
             .RequestCultureProviders = new List<IRequestCultureProvider>
             {
-                //new AcceptLanguageHeaderRequestCultureProvider(),
+                new AcceptLanguageHeaderRequestCultureProvider(),
                 //new QueryStringRequestCultureProvider(),
                 //new CookieRequestCultureProvider(),
                 //new RouteDataRequestCultureProvider(),
-                new CustomRequestCultureProvider(async context =>
+                /*new CustomRequestCultureProvider(async context =>
                 {
                     // Aquí debes implementar tu lógica para determinar la cultura basada en el contexto de la solicitud.
                     // Puedes leer cookies, cabeceras, etc. para decidir la cultura.
@@ -34,7 +40,7 @@
                     string culture = "es-ES";
 
                     return new ProviderCultureResult(culture);
-                })
+                })*/
             };
 });
 
diff --git a/src/Backend/Resources/Controllers/AboutController.en-US.resx b/src/Backend/Resources/Controllers/AboutController.en-US.resx
index 3d51f96..64bddc2 100644
--- a/src/Backend/Resources/Controllers/AboutController.en-US.resx
+++ b/src/Backend/Resources/Controllers/AboutController.en-US.resx
@@ -120,4 +120,7 @@
   <data name="About Title" xml:space="preserve">
     <value>About us</value>
   </data>
+  <data name="Resource not found" xml:space="preserve">
+    <value>Resource not found</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/src/Backend/Resources/Controllers/AboutController.en.resx b/src/Backend/Resources/Controllers/AboutController.en.resx
index 3d51f96..64bddc2 100644
--- a/src/Backend/Resources/Controllers/AboutController.en.resx
+++ b/src/Backend/Resources/Controllers/AboutController.en.resx
@@ -120,4 +120,7 @@
   <data name="About Title" xml:space="preserve">
     <value>About us</value>
   </data>
+  <data name="Resource not found" xml:space="preserve">
+    <value>Resource not found</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/src/Backend/Resources/Controllers/AboutController.es-ES.resx b/src/Backend/Resources/Controllers/AboutController.es-ES.resx
index e6d69b1..36ee74c 100644
--- a/src/Backend/Resources/Controllers/AboutController.es-ES.resx
+++ b/src/Backend/Resources/Controllers/AboutController.es-ES.resx
@@ -120,4 +120,7 @@
   <data name="About Title" xml:space="preserve">
     <value>Sobre nosotros</value>
   </data>
+  <data name="Resource not found" xml:space="preserve">
+    <value>Recurso no encontrado</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/src/Backend/Resources/Controllers/AboutController.es.resx b/src/Backend/Resources/Controllers/AboutController.es.resx
index e6d69b1..36ee74c 100644
--- a/src/Backend/Resources/Controllers/AboutController.es.resx
+++ b/src/Backend/Resources/Controllers/AboutController.es.resx
@@ -120,4 +120,7 @@
   <data name="About Title" xml:space="preserve">
     <value>Sobre nosotros</value>
   </data>
+  <data name="Resource not found" xml:space="preserve">
+    <value>Recurso no encontrado</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/src/Backend/Resources/SharedResource.en-US.resx b/src/Backend/Resources/SharedResource.en-US.resx
index 3f5df82..95c2e9d 100644
--- a/src/Backend/Resources/SharedResource.en-US.resx
+++ b/src/Backend/Resources/SharedResource.en-US.resx
@@ -117,6 +117,18 @@
   <resheader name="writer">
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
+  <data name="The Email field does not have a valid format." xml:space="preserve">
+    <value>The Email field does not have a valid format.</value>
+  </data>
+  <data name="The Email field is required." xml:space="preserve">
+    <value>The Email field is required.</value>
+  </data>
+  <data name="The Name field cannot be more than 50 characters." xml:space="preserve">
+    <value>The Name field cannot be more than 50 characters.</value>
+  </data>
+  <data name="The Name field is required." xml:space="preserve">
+    <value>The Name field is required.</value>
+  </data>
   <data name="Your application description page." xml:space="preserve">
     <value>Your application description page.</value>
   </data>
diff --git a/src/Backend/Resources/SharedResource.en.resx b/src/Backend/Resources/SharedResource.en.resx
index 3f5df82..95c2e9d 100644
--- a/src/Backend/Resources/SharedResource.en.resx
+++ b/src/Backend/Resources/SharedResource.en.resx
@@ -117,6 +117,18 @@
   <resheader name="writer">
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
+  <data name="The Email field does not have a valid format." xml:space="preserve">
+    <value>The Email field does not have a valid format.</value>
+  </data>
+  <data name="The Email field is required." xml:space="preserve">
+    <value>The Email field is required.</value>
+  </data>
+  <data name="The Name field cannot be more than 50 characters." xml:space="preserve">
+    <value>The Name field cannot be more than 50 characters.</value>
+  </data>
+  <data name="The Name field is required." xml:space="preserve">
+    <value>The Name field is required.</value>
+  </data>
   <data name="Your application description page." xml:space="preserve">
     <value>Your application description page.</value>
   </data>
diff --git a/src/Backend/Resources/SharedResource.es-ES.resx b/src/Backend/Resources/SharedResource.es-ES.resx
index 7efd338..479dc17 100644
--- a/src/Backend/Resources/SharedResource.es-ES.resx
+++ b/src/Backend/Resources/SharedResource.es-ES.resx
@@ -117,6 +117,18 @@
   <resheader name="writer">
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
+  <data name="The Email field does not have a valid format." xml:space="preserve">
+    <value>El campo Email no tiene un formato válido.</value>
+  </data>
+  <data name="The Email field is required." xml:space="preserve">
+    <value>El campo Email es obligatorio.</value>
+  </data>
+  <data name="The Name field cannot be more than 50 characters." xml:space="preserve">
+    <value>El campo Nombre no puede tener más de 50 caracteres.</value>
+  </data>
+  <data name="The Name field is required." xml:space="preserve">
+    <value>El campo Nombre es obligatorio.</value>
+  </data>
   <data name="Your application description page." xml:space="preserve">
     <value>La página de descripción de su aplicación.</value>
   </data>
diff --git a/src/Backend/Resources/SharedResource.es.resx b/src/Backend/Resources/SharedResource.es.resx
index 7efd338..479dc17 100644
--- a/src/Backend/Resources/SharedResource.es.resx
+++ b/src/Backend/Resources/SharedResource.es.resx
@@ -117,6 +117,18 @@
   <resheader name="writer">
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
+  <data name="The Email field does not have a valid format." xml:space="preserve">
+    <value>El campo Email no tiene un formato válido.</value>
+  </data>
+  <data name="The Email field is required." xml:space="preserve">
+    <value>El campo Email es obligatorio.</value>
+  </data>
+  <data name="The Name field cannot be more than 50 characters." xml:space="preserve">
+    <value>El campo Nombre no puede tener más de 50 caracteres.</value>
+  </data>
+  <data name="The Name field is required." xml:space="preserve">
+    <value>El campo Nombre es obligatorio.</value>
+  </data>
   <data name="Your application description page." xml:space="preserve">
     <value>La página de descripción de su aplicación.</value>
   </data>