diff --git a/src/main/kotlin/fr/dcproject/repository/Citizen.kt b/src/main/kotlin/fr/dcproject/repository/Citizen.kt
index 778c1be..3e858b7 100644
--- a/src/main/kotlin/fr/dcproject/repository/Citizen.kt
+++ b/src/main/kotlin/fr/dcproject/repository/Citizen.kt
@@ -24,6 +24,12 @@ class Citizen(override var requester: Requester) : RepositoryI<CitizenEntity> {
             .selectOne("user_id" to user.id)
     }
 
+    fun findByUsername(unsername: String): CitizenEntity? {
+        return requester
+            .getFunction("find_citizen_by_username")
+            .selectOne("username" to unsername)
+    }
+
     fun find(
         page: Int = 1,
         limit: Int = 50,
diff --git a/src/main/resources/sql/functions/citizen/find_citizen_by_username.sql b/src/main/resources/sql/functions/citizen/find_citizen_by_username.sql
new file mode 100644
index 0000000..0e54d2a
--- /dev/null
+++ b/src/main/resources/sql/functions/citizen/find_citizen_by_username.sql
@@ -0,0 +1,18 @@
+create or replace function find_citizen_by_username(username text, out resource json) language plpgsql as
+$$
+declare
+    _username alias for username;
+begin
+    select to_json(t) into resource
+    from (
+        select
+            z.*,
+            find_user_by_id(u.id) as "user"
+        from citizen as z
+        join "user" as u on z.user_id = u.id
+        where u.username = _username
+    ) as t;
+end;
+$$;
+
+-- drop function if exists find_citizen_by_username(text, out json);
\ No newline at end of file