4 files changed, 7 insertions, 7 deletions
diff --git a/src/DevHive.Data/Interfaces/Models/ILanguage.cs b/src/DevHive.Data/Interfaces/Models/ILanguage.cs
index 9549777..b77d5ae 100644
--- a/src/DevHive.Data/Interfaces/Models/ILanguage.cs
+++ b/src/DevHive.Data/Interfaces/Models/ILanguage.cs
@@ -6,7 +6,7 @@ namespace DevHive.Data.Interfaces.Models
 	public interface ILanguage : IModel
 	{
 		string Name { get; set; }
-		List<User> Users { get; set; }
+		HashSet<User> Users { get; set; }
 
 	}
 }
diff --git a/src/DevHive.Data/Interfaces/Models/IRole.cs b/src/DevHive.Data/Interfaces/Models/IRole.cs
index 0623f07..c8b7068 100644
--- a/src/DevHive.Data/Interfaces/Models/IRole.cs
+++ b/src/DevHive.Data/Interfaces/Models/IRole.cs
@@ -5,6 +5,6 @@ namespace DevHive.Data.Interfaces.Models
 {
 	public interface IRole
 	{
-		List<User> Users { get; set; }
+		HashSet<User> Users { get; set; }
 	}
 }
diff --git a/src/DevHive.Data/Interfaces/Models/ITechnology.cs b/src/DevHive.Data/Interfaces/Models/ITechnology.cs
index 159a21a..153f75f 100644
--- a/src/DevHive.Data/Interfaces/Models/ITechnology.cs
+++ b/src/DevHive.Data/Interfaces/Models/ITechnology.cs
@@ -6,6 +6,6 @@ namespace DevHive.Data.Interfaces.Models
 	public interface ITechnology : IModel
 	{
 		string Name { get; set; }
-		List<User> Users { get; set; }
+		HashSet<User> Users { get; set; }
 	}
 }
diff --git a/src/DevHive.Data/Interfaces/Models/IUser.cs b/src/DevHive.Data/Interfaces/Models/IUser.cs
index ef8c927..08ce385 100644
--- a/src/DevHive.Data/Interfaces/Models/IUser.cs
+++ b/src/DevHive.Data/Interfaces/Models/IUser.cs
@@ -8,9 +8,9 @@ namespace DevHive.Data.Interfaces.Models
 		string FirstName { get; set; }
 		string LastName { get; set; }
 		string ProfilePictureUrl { get; set; }
-		IList<Language> Languages { get; set; }
-		IList<Technology> Technologies { get; set; }
-		IList<Role> Roles { get; set; }
-		IList<User> Friends { get; set; }
+		HashSet<Language> Languages { get; set; }
+		HashSet<Technology> Technologies { get; set; }
+		HashSet<Role> Roles { get; set; }
+		HashSet<User> Friends { get; set; }
 	}
 }