diff --git a/TimetableDesigner.Backend.Services.Authentication.DTO/AuthenticatePasswordRequest.cs b/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/AuthenticatePasswordRequest.cs
similarity index 96%
rename from TimetableDesigner.Backend.Services.Authentication.DTO/AuthenticatePasswordRequest.cs
rename to TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/AuthenticatePasswordRequest.cs
index 7b66b8f..d16b8eb 100644
--- a/TimetableDesigner.Backend.Services.Authentication.DTO/AuthenticatePasswordRequest.cs
+++ b/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/AuthenticatePasswordRequest.cs
@@ -1,4 +1,4 @@
-namespace TimetableDesigner.Backend.Services.Authentication.DTO;
+namespace TimetableDesigner.Backend.Services.Authentication.DTO.API;
 
 public class AuthenticatePasswordRequest
 {
diff --git a/TimetableDesigner.Backend.Services.Authentication.DTO/AuthenticateResponse.cs b/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/AuthenticateResponse.cs
similarity index 96%
rename from TimetableDesigner.Backend.Services.Authentication.DTO/AuthenticateResponse.cs
rename to TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/AuthenticateResponse.cs
index 219f03f..76ed6e6 100644
--- a/TimetableDesigner.Backend.Services.Authentication.DTO/AuthenticateResponse.cs
+++ b/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/AuthenticateResponse.cs
@@ -1,4 +1,4 @@
-namespace TimetableDesigner.Backend.Services.Authentication.DTO;
+namespace TimetableDesigner.Backend.Services.Authentication.DTO.API;
 
 public class AuthenticateResponse
 {
diff --git a/TimetableDesigner.Backend.Services.Authentication.DTO/AuthenticateTokenRequest.cs b/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/AuthenticateTokenRequest.cs
similarity index 96%
rename from TimetableDesigner.Backend.Services.Authentication.DTO/AuthenticateTokenRequest.cs
rename to TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/AuthenticateTokenRequest.cs
index 08496d9..a964371 100644
--- a/TimetableDesigner.Backend.Services.Authentication.DTO/AuthenticateTokenRequest.cs
+++ b/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/AuthenticateTokenRequest.cs
@@ -1,4 +1,4 @@
-namespace TimetableDesigner.Backend.Services.Authentication.DTO;
+namespace TimetableDesigner.Backend.Services.Authentication.DTO.API;
 
 public class AuthenticateTokenRequest
 {
diff --git a/TimetableDesigner.Backend.Services.Authentication.DTO/RegisterRequest.cs b/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/RegisterRequest.cs
similarity index 96%
rename from TimetableDesigner.Backend.Services.Authentication.DTO/RegisterRequest.cs
rename to TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/RegisterRequest.cs
index 42f621f..2047f1f 100644
--- a/TimetableDesigner.Backend.Services.Authentication.DTO/RegisterRequest.cs
+++ b/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/RegisterRequest.cs
@@ -1,4 +1,4 @@
-namespace TimetableDesigner.Backend.Services.Authentication.DTO;
+namespace TimetableDesigner.Backend.Services.Authentication.DTO.API;
 
 public class RegisterRequest
 {
diff --git a/TimetableDesigner.Backend.Services.Authentication.DTO/RegisterResponse.cs b/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/RegisterResponse.cs
similarity index 92%
rename from TimetableDesigner.Backend.Services.Authentication.DTO/RegisterResponse.cs
rename to TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/RegisterResponse.cs
index bb53912..09726b9 100644
--- a/TimetableDesigner.Backend.Services.Authentication.DTO/RegisterResponse.cs
+++ b/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/RegisterResponse.cs
@@ -1,4 +1,4 @@
-namespace TimetableDesigner.Backend.Services.Authentication.DTO;
+namespace TimetableDesigner.Backend.Services.Authentication.DTO.API;
 
 public class RegisterResponse
 {
diff --git a/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.csproj b/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/TimetableDesigner.Backend.Services.Authentication.DTO.API.csproj
similarity index 77%
rename from TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.csproj
rename to TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/TimetableDesigner.Backend.Services.Authentication.DTO.API.csproj
index 17b910f..237d661 100644
--- a/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.csproj
+++ b/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.API/TimetableDesigner.Backend.Services.Authentication.DTO.API.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>net9.0</TargetFramework>
+        <TargetFramework>net10.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
     </PropertyGroup>
diff --git a/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.Events/TimetableDesigner.Backend.Services.Authentication.DTO.Events.csproj b/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.Events/TimetableDesigner.Backend.Services.Authentication.DTO.Events.csproj
new file mode 100644
index 0000000..237d661
--- /dev/null
+++ b/TimetableDesigner.Backend.Services.Authentication.DTO/TimetableDesigner.Backend.Services.Authentication.DTO.Events/TimetableDesigner.Backend.Services.Authentication.DTO.Events.csproj
@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net10.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>
diff --git a/TimetableDesigner.Backend.Services.Authentication.sln b/TimetableDesigner.Backend.Services.Authentication.sln
index 025f8ef..1a43359 100644
--- a/TimetableDesigner.Backend.Services.Authentication.sln
+++ b/TimetableDesigner.Backend.Services.Authentication.sln
@@ -2,7 +2,11 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TimetableDesigner.Backend.Services.Authentication", "TimetableDesigner.Backend.Services.Authentication\TimetableDesigner.Backend.Services.Authentication.csproj", "{F8C0AEF3-B53F-4904-90F7-EE4A8587F023}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TimetableDesigner.Backend.Services.Authentication.DTO", "TimetableDesigner.Backend.Services.Authentication.DTO\TimetableDesigner.Backend.Services.Authentication.DTO.csproj", "{384C8036-ACA7-40EB-924D-5E0271BEDB09}"
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "TimetableDesigner.Backend.Services.Authentication.DTO", "TimetableDesigner.Backend.Services.Authentication.DTO", "{B610971F-EF8F-45D2-B869-41617ED447C8}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TimetableDesigner.Backend.Services.Authentication.DTO.API", "TimetableDesigner.Backend.Services.Authentication.DTO\TimetableDesigner.Backend.Services.Authentication.DTO.API\TimetableDesigner.Backend.Services.Authentication.DTO.API.csproj", "{0639DAB9-E1B4-454E-A3E9-F7B712A697E8}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TimetableDesigner.Backend.Services.Authentication.DTO.Events", "TimetableDesigner.Backend.Services.Authentication.DTO\TimetableDesigner.Backend.Services.Authentication.DTO.Events\TimetableDesigner.Backend.Services.Authentication.DTO.Events.csproj", "{3E39EDEE-621F-49BC-B777-174BB047BCA7}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -14,9 +18,17 @@ Global
 		{F8C0AEF3-B53F-4904-90F7-EE4A8587F023}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{F8C0AEF3-B53F-4904-90F7-EE4A8587F023}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{F8C0AEF3-B53F-4904-90F7-EE4A8587F023}.Release|Any CPU.Build.0 = Release|Any CPU
-		{384C8036-ACA7-40EB-924D-5E0271BEDB09}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{384C8036-ACA7-40EB-924D-5E0271BEDB09}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{384C8036-ACA7-40EB-924D-5E0271BEDB09}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{384C8036-ACA7-40EB-924D-5E0271BEDB09}.Release|Any CPU.Build.0 = Release|Any CPU
+		{0639DAB9-E1B4-454E-A3E9-F7B712A697E8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0639DAB9-E1B4-454E-A3E9-F7B712A697E8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0639DAB9-E1B4-454E-A3E9-F7B712A697E8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0639DAB9-E1B4-454E-A3E9-F7B712A697E8}.Release|Any CPU.Build.0 = Release|Any CPU
+		{3E39EDEE-621F-49BC-B777-174BB047BCA7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3E39EDEE-621F-49BC-B777-174BB047BCA7}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3E39EDEE-621F-49BC-B777-174BB047BCA7}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3E39EDEE-621F-49BC-B777-174BB047BCA7}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{0639DAB9-E1B4-454E-A3E9-F7B712A697E8} = {B610971F-EF8F-45D2-B869-41617ED447C8}
+		{3E39EDEE-621F-49BC-B777-174BB047BCA7} = {B610971F-EF8F-45D2-B869-41617ED447C8}
 	EndGlobalSection
 EndGlobal
diff --git a/TimetableDesigner.Backend.Services.Authentication/API/Endpoints.cs b/TimetableDesigner.Backend.Services.Authentication/API/Endpoints.cs
index 1e9109e..1bce858 100644
--- a/TimetableDesigner.Backend.Services.Authentication/API/Endpoints.cs
+++ b/TimetableDesigner.Backend.Services.Authentication/API/Endpoints.cs
@@ -1,6 +1,6 @@
 using Microsoft.AspNetCore.Http.HttpResults;
-using TimetableDesigner.Backend.Services.Authentication.Application.Register;
-using TimetableDesigner.Backend.Services.Authentication.DTO;
+using TimetableDesigner.Backend.Services.Authentication.Application.Commands.Register;
+using TimetableDesigner.Backend.Services.Authentication.DTO.API;
 
 namespace TimetableDesigner.Backend.Services.Authentication.API;
 
@@ -18,11 +18,10 @@ public static class Endpoints
         return app;
     }
 
-    public static async Task<Results<Created<RegisterResponse>, ProblemHttpResult>> Register(RegisterRequest request, RegisterHandler handler)
+    public static async Task<Results<Created<RegisterResponse>, ProblemHttpResult>> Register(RegisterCommand command, RegisterHandler handler)
     {
-        RegisterCommand command = request.ToCommand();
-        RegisterResponse account = await handler.HandleAsync(command);
-        return Results.Created($"accounts/{account.Id}", account);
+        RegisterDto data = await handler.HandleAsync(command);
+        return Results.Created($"accounts/{data.Id}", data);
     }
 
     public static async Task<Results<Ok<AuthenticateResponse>, ProblemHttpResult>> AuthenticatePassword(AuthenticatePasswordRequest request)
diff --git a/TimetableDesigner.Backend.Services.Authentication/Application/Register/RegisterCommand.cs b/TimetableDesigner.Backend.Services.Authentication/Application/Commands/Register/RegisterCommand.cs
similarity index 80%
rename from TimetableDesigner.Backend.Services.Authentication/Application/Register/RegisterCommand.cs
rename to TimetableDesigner.Backend.Services.Authentication/Application/Commands/Register/RegisterCommand.cs
index 8e53983..33f6676 100644
--- a/TimetableDesigner.Backend.Services.Authentication/Application/Register/RegisterCommand.cs
+++ b/TimetableDesigner.Backend.Services.Authentication/Application/Commands/Register/RegisterCommand.cs
@@ -1,3 +1,3 @@
-namespace TimetableDesigner.Backend.Services.Authentication.Application.Register;
+namespace TimetableDesigner.Backend.Services.Authentication.Application.Commands.Register;
 
 public record RegisterCommand(string Email, string Password);
\ No newline at end of file
diff --git a/TimetableDesigner.Backend.Services.Authentication/Application/Commands/Register/RegisterDto.cs b/TimetableDesigner.Backend.Services.Authentication/Application/Commands/Register/RegisterDto.cs
new file mode 100644
index 0000000..5762b64
--- /dev/null
+++ b/TimetableDesigner.Backend.Services.Authentication/Application/Commands/Register/RegisterDto.cs
@@ -0,0 +1,6 @@
+namespace TimetableDesigner.Backend.Services.Authentication.Application.Commands.Register;
+
+public class RegisterDto
+{
+    
+}
\ No newline at end of file
diff --git a/TimetableDesigner.Backend.Services.Authentication/Application/Register/RegisterHandler.cs b/TimetableDesigner.Backend.Services.Authentication/Application/Commands/Register/RegisterHandler.cs
similarity index 70%
rename from TimetableDesigner.Backend.Services.Authentication/Application/Register/RegisterHandler.cs
rename to TimetableDesigner.Backend.Services.Authentication/Application/Commands/Register/RegisterHandler.cs
index e8eec35..f2b2a97 100644
--- a/TimetableDesigner.Backend.Services.Authentication/Application/Register/RegisterHandler.cs
+++ b/TimetableDesigner.Backend.Services.Authentication/Application/Commands/Register/RegisterHandler.cs
@@ -1,7 +1,6 @@
 using TimetableDesigner.Backend.Services.Authentication.Database;
-using TimetableDesigner.Backend.Services.Authentication.DTO;
 
-namespace TimetableDesigner.Backend.Services.Authentication.Application.Register;
+namespace TimetableDesigner.Backend.Services.Authentication.Application.Commands.Register;
 
 public class RegisterHandler
 {
@@ -12,7 +11,7 @@ public class RegisterHandler
         _databaseContext = databaseContext;
     }
 
-    public async Task<RegisterResponse> HandleAsync(RegisterCommand command)
+    public async Task<RegisterDto> HandleAsync(RegisterCommand command)
     {
         return null;
     }
diff --git a/TimetableDesigner.Backend.Services.Authentication/Application/Register/RegisterRequestMapper.cs b/TimetableDesigner.Backend.Services.Authentication/Application/Register/RegisterRequestMapper.cs
deleted file mode 100644
index cde2fcc..0000000
--- a/TimetableDesigner.Backend.Services.Authentication/Application/Register/RegisterRequestMapper.cs
+++ /dev/null
@@ -1,8 +0,0 @@
-using TimetableDesigner.Backend.Services.Authentication.DTO;
-
-namespace TimetableDesigner.Backend.Services.Authentication.Application.Register;
-
-public static class RegisterRequestMapper
-{
-    public static RegisterCommand ToCommand(this RegisterRequest request) => new RegisterCommand(request.Email, request.Password);
-}
\ No newline at end of file
diff --git a/TimetableDesigner.Backend.Services.Authentication/DTO/Validators/RegisterRequestValidator.cs b/TimetableDesigner.Backend.Services.Authentication/DTO/Validators/RegisterRequestValidator.cs
new file mode 100644
index 0000000..3091c72
--- /dev/null
+++ b/TimetableDesigner.Backend.Services.Authentication/DTO/Validators/RegisterRequestValidator.cs
@@ -0,0 +1,33 @@
+using FluentValidation;
+using Microsoft.EntityFrameworkCore;
+using TimetableDesigner.Backend.Services.Authentication.Database;
+using TimetableDesigner.Backend.Services.Authentication.DTO.API;
+
+namespace TimetableDesigner.Backend.Services.Authentication.DTO.Validators;
+
+public class RegisterRequestValidator : AbstractValidator<RegisterRequest>
+{
+    private readonly DatabaseContext _databaseContext;
+    
+    public RegisterRequestValidator(DatabaseContext databaseContext)
+    {
+        _databaseContext = databaseContext;
+        
+        RuleFor(x => x.Email)
+           .NotEmpty()
+           .EmailAddress()
+           .MustAsync(EmailNotUsed).WithMessage("Email already used");
+        RuleFor(x => x.Password)
+           .NotEmpty()
+           .MinimumLength(8)
+           .Must(x => x.Any(char.IsUpper)).WithMessage("Password must contain at least one uppercase letter")
+           .Must(x => x.Any(char.IsLower)).WithMessage("Password must contain at least one lowercase letter")
+           .Must(x => x.Any(char.IsDigit)).WithMessage("Password must contain at least one digit");
+        RuleFor(x => x.PasswordConfirmation)
+           .NotEmpty()
+           .Equal(x => x.Password);
+    }
+
+    private Task<bool> EmailNotUsed(string value, CancellationToken cancellationToken) => 
+        _databaseContext.Accounts.AnyAsync(x => x.Email == value, cancellationToken);
+}
\ No newline at end of file
diff --git a/TimetableDesigner.Backend.Services.Authentication/Program.cs b/TimetableDesigner.Backend.Services.Authentication/Program.cs
index be6e8ca..8944403 100644
--- a/TimetableDesigner.Backend.Services.Authentication/Program.cs
+++ b/TimetableDesigner.Backend.Services.Authentication/Program.cs
@@ -1,6 +1,10 @@
+using System.Reflection;
+using FluentValidation;
+using Microsoft.AspNetCore.Identity.Data;
 using Microsoft.EntityFrameworkCore;
 using TimetableDesigner.Backend.Services.Authentication.API;
 using TimetableDesigner.Backend.Services.Authentication.Database;
+using TimetableDesigner.Backend.Services.Authentication.DTO.Validators;
 
 namespace TimetableDesigner.Backend.Services.Authentication;
 
@@ -12,6 +16,7 @@ public static class Program
                                            .SetupOpenApi()
                                            .SetupSecurity()
                                            .SetupDatabase()
+                                           .SetupValidation()
                                            .Build();
         
         if (app.Environment.IsDevelopment())
@@ -40,6 +45,12 @@ public static class Program
         builder.Services.AddDbContext<DatabaseContext>(x => x.UseNpgsql(builder.Configuration.GetConnectionString("Database")), ServiceLifetime.Transient);
         return builder;
     }
+
+    private static WebApplicationBuilder SetupValidation(this WebApplicationBuilder builder)
+    {
+        builder.Services.AddScoped<IValidator<TimetableDesigner.Backend.Services.Authentication.DTO.API.RegisterRequest>, RegisterRequestValidator>();
+        return builder;
+    }
     
     private static WebApplication InitializeDatabase(this WebApplication app)
     {
diff --git a/TimetableDesigner.Backend.Services.Authentication/TimetableDesigner.Backend.Services.Authentication.csproj b/TimetableDesigner.Backend.Services.Authentication/TimetableDesigner.Backend.Services.Authentication.csproj
index dc3bf08..6d817d5 100644
--- a/TimetableDesigner.Backend.Services.Authentication/TimetableDesigner.Backend.Services.Authentication.csproj
+++ b/TimetableDesigner.Backend.Services.Authentication/TimetableDesigner.Backend.Services.Authentication.csproj
@@ -1,13 +1,15 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
     <PropertyGroup>
-        <TargetFramework>net9.0</TargetFramework>
+        <TargetFramework>net10.0</TargetFramework>
         <Nullable>enable</Nullable>
         <ImplicitUsings>enable</ImplicitUsings>
         <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
+        <LangVersion>14</LangVersion>
     </PropertyGroup>
 
     <ItemGroup>
+      <PackageReference Include="FluentValidation" Version="12.1.1" />
       <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.9" />
       <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="9.0.9">
         <PrivateAssets>all</PrivateAssets>
@@ -17,11 +19,11 @@
     </ItemGroup>
 
     <ItemGroup>
-      <Folder Include="Workers\" />
+      <Folder Include="DTO\Mappers\" />
     </ItemGroup>
 
     <ItemGroup>
-      <ProjectReference Include="..\TimetableDesigner.Backend.Services.Authentication.DTO\TimetableDesigner.Backend.Services.Authentication.DTO.csproj" />
+      <ProjectReference Include="..\TimetableDesigner.Backend.Services.Authentication.DTO\TimetableDesigner.Backend.Services.Authentication.DTO.API\TimetableDesigner.Backend.Services.Authentication.DTO.API.csproj" />
     </ItemGroup>
 
 </Project>