diff --git a/lib/decentralised_book_index/accounts/user.ex b/lib/decentralised_book_index/accounts/user.ex
index 5a38c5e..08fbba4 100644
--- a/lib/decentralised_book_index/accounts/user.ex
+++ b/lib/decentralised_book_index/accounts/user.ex
@@ -218,6 +218,27 @@ defmodule DecentralisedBookIndex.Accounts.User do
       # Generates an authentication token for the user
       change AshAuthentication.GenerateTokenChange
     end
+
+    update :set_role do
+      description "Sets user role"
+      accept [:role]
+    end
+
+    update :make_moderator do
+      description "Sets user role to moderator"
+      change set_attribute(:role, :moderator)
+    end
+
+    update :make_user do
+      description "Sets user role to user"
+      change set_attribute(:role, :user)
+    end
+
+    read :list_moderators do
+      description "Looks up users with the moderator role"
+
+      filter expr(role == :moderator)
+    end
   end
 
   policies do
@@ -252,4 +273,15 @@ defmodule DecentralisedBookIndex.Accounts.User do
   identities do
     identity :unique_email, [:email]
   end
+
+  code_interface do
+    define :list_moderators
+
+    define :get_by_id, action: :read, get_by: [:id]
+    define :get_by_email, args: [:email]
+
+    define :set_role, args: [:role]
+    define :make_moderator
+    define :make_user
+  end
 end