diff --git a/BeReadyBackend/Validators/Achievements/GetAchievementDtoValidator.cs b/BeReadyBackend/Validators/Achievements/GetAchievementDtoValidator.cs
new file mode 100644
index 0000000..da6df0d
--- /dev/null
+++ b/BeReadyBackend/Validators/Achievements/GetAchievementDtoValidator.cs
@@ -0,0 +1,31 @@
+using BeReadyBackend.DTO.Achievements;
+using FastEndpoints;
+using FluentValidation;
+
+namespace BeReadyBackend.Validators.Achievements;
+
+public class GetAchievementDtoValidator : Validator<GetAchievementDto>
+{
+    public GetAchievementDtoValidator()
+    {
+        RuleFor(x => x.Id)
+            .GreaterThan(0)
+            .WithMessage("Id must be greater than 0");
+
+        RuleFor(x => x.Description)
+            .NotEmpty()
+            .WithMessage("Description must be specified")
+            .MinimumLength(2)
+            .WithMessage("Description must contain more than 2 characters")
+            .MaximumLength(200) // Add BDD
+            .WithMessage("Description cannot contain more than 200 characters");
+        
+        RuleFor(x => x.Label)
+            .NotEmpty()
+            .WithMessage("Label must be specified")
+            .MinimumLength(2)
+            .WithMessage("Description must contain more than 2 characters")
+            .MaximumLength(200) // Add BDD
+            .WithMessage("Description cannot contain more than 200 characters");
+    }
+}
\ No newline at end of file
diff --git a/BeReadyBackend/Validators/Achievements/UnlockAchievementDtoValidator.cs b/BeReadyBackend/Validators/Achievements/UnlockAchievementDtoValidator.cs
new file mode 100644
index 0000000..453d0fb
--- /dev/null
+++ b/BeReadyBackend/Validators/Achievements/UnlockAchievementDtoValidator.cs
@@ -0,0 +1,18 @@
+using BeReadyBackend.DTO.Achievements;
+using FastEndpoints;
+using FluentValidation;
+
+namespace BeReadyBackend.Validators.Achievements;
+
+public class UnlockAchievementDtoValidator : Validator<UnlockAchievementDto>
+{
+    public UnlockAchievementDtoValidator()
+    {
+        RuleFor(x => x.AchievementId)
+            .NotEmpty()
+            .WithMessage("AchievementId cannot be empty")
+            .GreaterThan(0)
+            .WithMessage("AchievementId must be greater than 0");
+            
+    }
+}
\ No newline at end of file
diff --git a/BeReadyBackend/Validators/Auth/GetTokenDtoValidator.cs b/BeReadyBackend/Validators/Auth/GetTokenDtoValidator.cs
new file mode 100644
index 0000000..b10e2e1
--- /dev/null
+++ b/BeReadyBackend/Validators/Auth/GetTokenDtoValidator.cs
@@ -0,0 +1,15 @@
+using BeReadyBackend.DTO.Auth;
+using FastEndpoints;
+using FluentValidation;
+
+namespace BeReadyBackend.Validators.Auth;
+
+public class GetTokenDtoValidator : Validator<GetTokenDto>
+{
+    public GetTokenDtoValidator()
+    {
+        RuleFor(x => x.Token)
+            .NotEmpty()
+            .WithMessage("Token cannot be empty");
+    }
+}
\ No newline at end of file
diff --git a/BeReadyBackend/Validators/Auth/LoginDtoValidator.cs b/BeReadyBackend/Validators/Auth/LoginDtoValidator.cs
new file mode 100644
index 0000000..da5284a
--- /dev/null
+++ b/BeReadyBackend/Validators/Auth/LoginDtoValidator.cs
@@ -0,0 +1,23 @@
+using BeReadyBackend.DTO.Auth;
+using FastEndpoints;
+using FluentValidation;
+
+namespace BeReadyBackend.Validators.Auth;
+
+public class LoginDtoValidator: Validator<LoginDto>
+{
+    public LoginDtoValidator()
+    {
+        RuleFor(x => x.Username)
+            .NotEmpty()
+            .WithMessage("Username is required")
+            .MaximumLength(50)
+            .WithMessage("Username cannot exceed 50 characters")
+            .MinimumLength(2)
+            .WithMessage("Username must exceed 2 characters");
+
+        RuleFor(x => x.Password)
+            .NotEmpty()
+            .WithMessage("Password is required");
+    }
+}
\ No newline at end of file
diff --git a/BeReadyBackend/Validators/Auth/RefreshTokenDtoValidator.cs b/BeReadyBackend/Validators/Auth/RefreshTokenDtoValidator.cs
new file mode 100644
index 0000000..22f6eba
--- /dev/null
+++ b/BeReadyBackend/Validators/Auth/RefreshTokenDtoValidator.cs
@@ -0,0 +1,15 @@
+using BeReadyBackend.DTO.Auth;
+using FastEndpoints;
+using FluentValidation;
+
+namespace BeReadyBackend.Validators.Auth;
+
+public class RefreshTokenDtoValidator : Validator<RefreshTokenDto>
+{
+    public RefreshTokenDtoValidator()
+    {
+        RuleFor(x => x.Token)
+            .NotEmpty()
+            .WithMessage("Token cannot be empty");
+    }
+}
\ No newline at end of file
diff --git a/BeReadyBackend/Validators/Designations/GetDesignationDtoValidator.cs b/BeReadyBackend/Validators/Designations/GetDesignationDtoValidator.cs
new file mode 100644
index 0000000..7b48147
--- /dev/null
+++ b/BeReadyBackend/Validators/Designations/GetDesignationDtoValidator.cs
@@ -0,0 +1,25 @@
+using BeReadyBackend.DTO.Designations;
+using FastEndpoints;
+using FluentValidation;
+
+namespace BeReadyBackend.Validators.Designations;
+
+public class GetDesignationDtoValidator : Validator<GetDesignationDto>
+{
+    public GetDesignationDtoValidator()
+    {
+        RuleFor(x => x.Id)
+            .NotEmpty()
+            .WithMessage("Id cannot be empty")
+            .GreaterThan(0)
+            .WithMessage("Id must be greater than 0");
+
+        RuleFor(x => x.Label)
+            .NotEmpty()
+            .WithMessage("Label cannot be empty")
+            .MaximumLength(100) // Add BDD
+            .WithMessage("Label cannot contain more than 100 characters")
+            .MinimumLength(2)
+            .WithMessage("Label must contain more than 2 characters");
+    }
+}
\ No newline at end of file
diff --git a/BeReadyBackend/Validators/Groups/CreateGroupDtoValidator.cs b/BeReadyBackend/Validators/Groups/CreateGroupDtoValidator.cs
new file mode 100644
index 0000000..ece2ebd
--- /dev/null
+++ b/BeReadyBackend/Validators/Groups/CreateGroupDtoValidator.cs
@@ -0,0 +1,41 @@
+using BeReadyBackend.DTO.Groups;
+using FastEndpoints;
+using FluentValidation;
+
+namespace BeReadyBackend.Validators.Groups;
+
+public class CreateGroupDtoValidator : Validator<CreateGroupDto>
+{
+    public CreateGroupDtoValidator()
+    {
+        RuleFor(x => x.Label)
+            .NotEmpty()
+            .WithMessage("Label cannot be empty")
+            .MaximumLength(50) // Add BDD
+            .WithMessage("Label cannot exceed 50 characters")
+            .MinimumLength(2)
+            .WithMessage("Label must exceed 2 characters");
+
+        RuleFor(x => x.Title)
+            .NotEmpty()
+            .WithMessage("Title cannot be empty")
+            .MaximumLength(50) // Add BDD
+            .WithMessage("Title cannot exceed 50 characters")
+            .MinimumLength(2)
+            .WithMessage("Title must exceed 2 characters");
+
+        RuleFor(x => x.Description)
+            .NotEmpty()
+            .WithMessage("Description cannot be empty")
+            .MaximumLength(200) // Add BDD
+            .WithMessage("Description cannot exceed 50 characters")
+            .MinimumLength(2)
+            .WithMessage("Description must exceed 2 characters");
+        
+        RuleFor(x => x.Duration)
+            .NotEmpty()
+            .WithMessage("Duration cannot be empty")
+            .GreaterThan(0)
+            .WithMessage("Duration must exceed 1 hour");
+    }
+}
\ No newline at end of file
diff --git a/BeReadyBackend/Validators/Groups/CreateUserGroupDtoValidator.cs b/BeReadyBackend/Validators/Groups/CreateUserGroupDtoValidator.cs
new file mode 100644
index 0000000..72555d6
--- /dev/null
+++ b/BeReadyBackend/Validators/Groups/CreateUserGroupDtoValidator.cs
@@ -0,0 +1,17 @@
+using BeReadyBackend.DTO.Groups;
+using FastEndpoints;
+using FluentValidation;
+
+namespace BeReadyBackend.Validators.Groups;
+
+public class CreateUserGroupDtoValidator : Validator<CreateUserGroupDto>
+{
+    public CreateUserGroupDtoValidator()
+    {
+        RuleFor(x => x.UserId)
+            .NotEmpty()
+            .WithMessage("UserId cannot be empty")
+            .GreaterThan(0)
+            .WithMessage("UserId must exceed 1 hour");
+    }
+}
\ No newline at end of file
diff --git a/BeReadyBackend/Validators/Groups/GetGroupDetailsDtoValidator.cs b/BeReadyBackend/Validators/Groups/GetGroupDetailsDtoValidator.cs
new file mode 100644
index 0000000..1486436
--- /dev/null
+++ b/BeReadyBackend/Validators/Groups/GetGroupDetailsDtoValidator.cs
@@ -0,0 +1,55 @@
+using BeReadyBackend.DTO.Groups;
+using FastEndpoints;
+using FluentValidation;
+
+namespace BeReadyBackend.Validators.Groups;
+
+public class GetGroupDetailsDtoValidator : Validator<GetGroupDetailsDto>
+{
+    public GetGroupDetailsDtoValidator()
+    {
+        RuleFor(x => x.Id)
+            .NotEmpty()
+            .WithMessage("Id cannot be empty")
+            .GreaterThan(0)
+            .WithMessage("Id must be greater than zero");
+        
+        RuleFor(x => x.Label)
+            .NotEmpty()
+            .WithMessage("Label cannot be empty")
+            .MaximumLength(50) // Add BDD
+            .WithMessage("Label cannot exceed 50 characters")
+            .MinimumLength(2)
+            .WithMessage("Label must exceed 2 characters");
+
+        RuleFor(x => x.IsFinished)
+            .NotEmpty()
+            .WithMessage("IsFinished cannot be empty");
+
+        RuleFor(x => x.Title)
+            .NotEmpty()
+            .WithMessage("Title cannot be empty")
+            .MaximumLength(100) // Add BDD
+            .WithMessage("Title cannot exceed 50 characters")
+            .MinimumLength(2)
+            .WithMessage("Title must exceed 2 characters");
+
+        RuleFor(x => x.Description)
+            .NotEmpty()
+            .WithMessage("Description cannot be empty")
+            .MaximumLength(200) // Add BDD
+            .WithMessage("Description cannot exceed 50 characters")
+            .MinimumLength(2)
+            .WithMessage("Description must exceed 2 characters");
+        
+        RuleFor(x => x.Duration)
+            .NotEmpty()
+            .WithMessage("Duration cannot be empty")
+            .GreaterThan(0)
+            .WithMessage("Duration must exceed 1 hour");
+
+        RuleFor(x => x.CreationDate)
+            .NotEmpty()
+            .WithMessage("CreationDate cannot be empty");
+    }
+}
\ No newline at end of file
diff --git a/BeReadyBackend/Validators/Groups/GetGroupDtoValidator.cs b/BeReadyBackend/Validators/Groups/GetGroupDtoValidator.cs
new file mode 100644
index 0000000..8b3c761
--- /dev/null
+++ b/BeReadyBackend/Validators/Groups/GetGroupDtoValidator.cs
@@ -0,0 +1,29 @@
+using BeReadyBackend.DTO.Groups;
+using FastEndpoints;
+using FluentValidation;
+
+namespace BeReadyBackend.Validators.Groups;
+
+public class GetGroupDtoValidator : Validator<GetGroupDto>
+{
+    public GetGroupDtoValidator()
+    {
+        RuleFor(x => x.Id)
+            .NotEmpty()
+            .WithMessage("Id cannot be empty")
+            .GreaterThan(0)
+            .WithMessage("Id must be greater than zero");
+        
+        RuleFor(x => x.Label)
+            .NotEmpty()
+            .WithMessage("Label cannot be empty")
+            .MaximumLength(50) // Add BDD
+            .WithMessage("Label cannot exceed 50 characters")
+            .MinimumLength(2)
+            .WithMessage("Label must exceed 2 characters");
+
+        RuleFor(x => x.IsFinished)
+            .NotEmpty()
+            .WithMessage("IsFinished cannot be empty");
+    }
+}
\ No newline at end of file
diff --git a/BeReadyBackend/Validators/Groups/GetGroupRankingDtoValidator.cs b/BeReadyBackend/Validators/Groups/GetGroupRankingDtoValidator.cs
new file mode 100644
index 0000000..ed0ae21
--- /dev/null
+++ b/BeReadyBackend/Validators/Groups/GetGroupRankingDtoValidator.cs
@@ -0,0 +1,29 @@
+using BeReadyBackend.DTO.Groups;
+using FastEndpoints;
+using FluentValidation;
+
+namespace BeReadyBackend.Validators.Groups;
+
+public class GetGroupRankingDtoValidator : Validator<GetGroupRankingDto>
+{
+    public GetGroupRankingDtoValidator()
+    {
+        RuleFor(x => x.UserId)
+            .NotEmpty()
+            .WithMessage("Id cannot be empty")
+            .GreaterThan(0)
+            .WithMessage("Id must be greater than 0");
+
+        RuleFor(x => x.Username)
+            .NotEmpty()
+            .WithMessage("Username cannot be empty")
+            .MaximumLength(50)
+            .WithMessage("Username cannot exceed 50 characters")
+            .MinimumLength(2)
+            .WithMessage("Username must exceed 2 characters");
+
+        RuleFor(x => x.Score)
+            .NotEmpty()
+            .WithMessage("Score cannot be empty");
+    }
+}
\ No newline at end of file
diff --git a/BeReadyBackend/Validators/Groups/GetProofDtoValidator.cs b/BeReadyBackend/Validators/Groups/GetProofDtoValidator.cs
new file mode 100644
index 0000000..cb24ca8
--- /dev/null
+++ b/BeReadyBackend/Validators/Groups/GetProofDtoValidator.cs
@@ -0,0 +1,33 @@
+using BeReadyBackend.DTO.Groups;
+using FastEndpoints;
+using FluentValidation;
+
+namespace BeReadyBackend.Validators.Groups;
+
+public class GetProofDtoValidator : Validator<GetProofDto>
+{
+    public GetProofDtoValidator()
+    {
+        RuleFor(x => x.UserId)
+            .NotEmpty()
+            .WithMessage("Id cannot be empty")
+            .GreaterThan(0)
+            .WithMessage("Id must be greater than 0");
+        
+        RuleFor(x => x.Username)
+            .NotEmpty()
+            .WithMessage("Username cannot be empty")
+            .MaximumLength(50)
+            .WithMessage("Username cannot exceed 50 characters")
+            .MinimumLength(2)
+            .WithMessage("Username must exceed 2 characters");
+
+        RuleFor(x => x.Proof)
+            .NotEmpty()
+            .WithMessage("Proof cannot be empty");
+        
+        RuleFor(x => x.Score)
+            .NotEmpty()
+            .WithMessage("Score cannot be empty");
+    }
+}
\ No newline at end of file
diff --git a/BeReadyBackend/Validators/Groups/GetUserGroupDtoValidator.cs b/BeReadyBackend/Validators/Groups/GetUserGroupDtoValidator.cs
new file mode 100644
index 0000000..b290ebe
--- /dev/null
+++ b/BeReadyBackend/Validators/Groups/GetUserGroupDtoValidator.cs
@@ -0,0 +1,33 @@
+using BeReadyBackend.DTO.Groups;
+using FastEndpoints;
+using FluentValidation;
+
+namespace BeReadyBackend.Validators.Groups;
+
+public class GetUserGroupDtoValidator : Validator<GetUserGroupDto>
+{
+    public GetUserGroupDtoValidator()
+    {
+        RuleFor(x => x.Id)
+            .NotEmpty()
+            .WithMessage("Id cannot be empty")
+            .GreaterThan(0)
+            .WithMessage("Id must be greater than 0");
+        
+        RuleFor(x => x.Username)
+            .NotEmpty()
+            .WithMessage("Username cannot be empty")
+            .MaximumLength(50)
+            .WithMessage("Username cannot exceed 50 characters")
+            .MinimumLength(2)
+            .WithMessage("Username must exceed 2 characters");
+
+        RuleFor(x => x.Grade)
+            .NotEmpty()
+            .WithMessage("Grade cannot be empty");
+        
+        RuleFor(x => x.Score)
+            .NotEmpty()
+            .WithMessage("Score cannot be empty");
+    }
+}
\ No newline at end of file