diff --git a/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/security/repository/AdminRoleRepository.java b/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/security/repository/AdminRoleRepository.java
new file mode 100644
index 000000000..581f1189a
--- /dev/null
+++ b/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/security/repository/AdminRoleRepository.java
@@ -0,0 +1,15 @@
+package edu.internet2.tier.shibboleth.admin.ui.security.repository;
+
+import edu.internet2.tier.shibboleth.admin.ui.security.model.AdminRole;
+
+import java.util.Optional;
+
+/**
+ * Spring Data repository to manage entities of type {@link AdminRole}.
+ *
+ * @author Dmitriy Kopylenko
+ */
+public interface AdminRoleRepository {
+
+    Optional<AdminRole> findByName(final String name);
+}
diff --git a/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/security/repository/AdminUserRepository.java b/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/security/repository/AdminUserRepository.java
new file mode 100644
index 000000000..d5fe4c314
--- /dev/null
+++ b/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/security/repository/AdminUserRepository.java
@@ -0,0 +1,14 @@
+package edu.internet2.tier.shibboleth.admin.ui.security.repository;
+
+import edu.internet2.tier.shibboleth.admin.ui.security.model.AdminUser;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+/**
+ * Spring Data repository to manage entities of type {@link AdminUser}.
+ *
+ * @author Dmitriy Kopylenko
+ */
+public interface AdminUserRepository extends JpaRepository<AdminUser, Long> {
+
+    AdminUser findByUsername(String username);
+}
diff --git a/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/security/springsecurity/AdminUserService.java b/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/security/springsecurity/AdminUserService.java
new file mode 100644
index 000000000..00d36d381
--- /dev/null
+++ b/backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/security/springsecurity/AdminUserService.java
@@ -0,0 +1,40 @@
+package edu.internet2.tier.shibboleth.admin.ui.security.springsecurity;
+
+import edu.internet2.tier.shibboleth.admin.ui.security.model.AdminRole;
+import edu.internet2.tier.shibboleth.admin.ui.security.model.AdminUser;
+import edu.internet2.tier.shibboleth.admin.ui.security.repository.AdminUserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.core.authority.SimpleGrantedAuthority;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * Spring Security {@link UserDetailsService} implementation for local administration of admin users ins the system.
+ *
+ * @author Dmitriy Kopylenko
+ */
+@RequiredArgsConstructor
+public class AdminUserService implements UserDetailsService {
+
+    private final AdminUserRepository adminUserRepository;
+
+    @Override
+    @Transactional(readOnly = true)
+    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
+        AdminUser user = adminUserRepository.findByUsername(username);
+
+        Set<GrantedAuthority> grantedAuthorities = new HashSet<>();
+        for (AdminRole role : user.getRoles()) {
+            grantedAuthorities.add(new SimpleGrantedAuthority(role.getName()));
+        }
+
+        return new org.springframework.security.core.userdetails.User(user.getUsername(), user.getPassword(), grantedAuthorities);
+    }
+}
+