diff --git a/src/Bundle/ChillMainBundle/Repository/UserRepository.php b/src/Bundle/ChillMainBundle/Repository/UserRepository.php
index 89ed84308..fe8dd4368 100644
--- a/src/Bundle/ChillMainBundle/Repository/UserRepository.php
+++ b/src/Bundle/ChillMainBundle/Repository/UserRepository.php
@@ -16,11 +16,10 @@ use Chill\MainBundle\Entity\User;
 use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\ORM\EntityRepository;
 use Doctrine\ORM\QueryBuilder;
-use Doctrine\Persistence\ObjectRepository;
 
 use function count;
 
-final class UserRepository implements ObjectRepository
+final class UserRepository implements UserRepositoryInterface
 {
     private EntityManagerInterface $entityManager;
 
@@ -171,7 +170,7 @@ final class UserRepository implements ObjectRepository
         return $qb->getQuery()->getResult();
     }
 
-    public function getClassName()
+    public function getClassName(): string
     {
         return User::class;
     }
diff --git a/src/Bundle/ChillMainBundle/Repository/UserRepositoryInterface.php b/src/Bundle/ChillMainBundle/Repository/UserRepositoryInterface.php
new file mode 100644
index 000000000..0201607fe
--- /dev/null
+++ b/src/Bundle/ChillMainBundle/Repository/UserRepositoryInterface.php
@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Repository;
+
+use Chill\MainBundle\Entity\User;
+use Doctrine\Persistence\ObjectRepository;
+
+interface UserRepositoryInterface extends ObjectRepository
+{
+    public function countBy(array $criteria): int;
+
+    public function countByActive(): int;
+
+    public function countByUsernameOrEmail(string $pattern): int;
+
+    public function find($id, $lockMode = null, $lockVersion = null): ?User;
+
+    /**
+     * @return User[]
+     */
+    public function findAll(): array;
+
+    /**
+     * @param mixed|null $limit
+     * @param mixed|null $offset
+     *
+     * @return User[]
+     */
+    public function findBy(array $criteria, ?array $orderBy = null, $limit = null, $offset = null): array;
+
+    /**
+     * @return array|User[]
+     */
+    public function findByActive(?array $orderBy = null, ?int $limit = null, ?int $offset = null): array;
+
+    public function findByUsernameOrEmail(string $pattern, ?array $orderBy = [], ?int $limit = null, ?int $offset = null): array;
+
+    public function findOneBy(array $criteria, ?array $orderBy = null): ?User;
+
+    public function findOneByUsernameOrEmail(string $pattern);
+
+    /**
+     * Get the users having a specific flags.
+     *
+     * If provided, only the users amongst "filtered users" are searched. This
+     * allows to make a first search amongst users based on role and center
+     * and, then filter those users having some flags.
+     *
+     * @param \Chill\MainBundle\Entity\User[] $amongstUsers
+     * @param mixed $flag
+     */
+    public function findUsersHavingFlags($flag, array $amongstUsers = []): array;
+
+    public function getClassName(): string;
+}