diff --git a/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/service/LoginAttemptService.java b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/service/LoginAttemptService.java
new file mode 100644
index 0000000..efedd4e
--- /dev/null
+++ b/support-portal-backend/src/main/java/net/shyshkin/study/fullstack/supportportal/backend/service/LoginAttemptService.java
@@ -0,0 +1,14 @@
+package net.shyshkin.study.fullstack.supportportal.backend.service;
+
+public interface LoginAttemptService {
+
+    static final int MAX_ATTEMPTS = 5;
+    static final int ATTEMPT_INCREMENT = 1;
+
+    void loginFailed(String username);
+
+    void loginSucceeded(String username);
+
+    boolean hasExceededMaxAttempts(String username);
+
+}