diff --git a/src/main/java/mate/academy/service/AuthenticationService.java b/src/main/java/mate/academy/service/AuthenticationService.java
index 8f7c7c975..944a3f020 100644
--- a/src/main/java/mate/academy/service/AuthenticationService.java
+++ b/src/main/java/mate/academy/service/AuthenticationService.java
@@ -1,16 +1,26 @@
 package mate.academy.service;
 
+import static mate.academy.service.UserService.users;
+
+import mate.academy.model.User;
+
 public class AuthenticationService {
     /**
      * Imagine that some user wants to login to your site.
      * You should check if user credentials (login and password) are valid or not.
      * All users are stored in <code>UserService</code> class.
-     * @param email - user's email
+     *
+     * @param email    - user's email
      * @param password - user's password
      * @return true if user by email exists and passed password is equal to user's password.
      * Return false in any other cases.
      */
     public boolean login(String email, String password) {
+        for (User user : users) {
+            if (email.equals(user.getEmail()) && password.equals(user.getPassword())) {
+                return true;
+            }
+        }
         return false;
     }
 }
diff --git a/src/main/java/mate/academy/service/UserService.java b/src/main/java/mate/academy/service/UserService.java
index 1652d7d68..929c76a0e 100644
--- a/src/main/java/mate/academy/service/UserService.java
+++ b/src/main/java/mate/academy/service/UserService.java
@@ -3,18 +3,25 @@
 import mate.academy.model.User;
 
 public class UserService {
-    private static final User[] users = new User[] {
+    public static final User[] users = new User[]{
             new User("bob@i.ua", "1234"),
             new User("alice@i.ua", "1234")
     };
 
     /**
      * Find user by email. All users are stored in <code>private static final User[] users</code>
+     *
      * @param email - the input parameter
      * @return - user if his email is equal to passed email.
      * Return <code>null</code> if there is no suitable user
      */
+
     public User findByEmail(String email) {
+        for (User user : users) {
+            if (email.equals(user.getEmail())) {
+                return user;
+            }
+        }
         return null;
     }
 }