diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5657f6e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+vendor
\ No newline at end of file
diff --git a/assets/css/style.css b/assets/css/style.css
new file mode 100644
index 0000000..5ccbca0
--- /dev/null
+++ b/assets/css/style.css
@@ -0,0 +1,28 @@
+.like-button {
+    padding: 10px;
+    cursor: pointer;
+    border-radius: 5px;
+    transition: all 0.4s ease;
+    display: flex;
+    justify-content: center;
+}
+
+.like-button:not(.liked){
+    border: 1px solid green!important;
+    color: green;
+}
+
+.like-button:not(.liked):hover {
+    background: green;
+    color: white;
+}
+
+.like-button.liked {
+    color: red;
+    border: 1px solid red!important;
+}
+
+.like-button.liked:hover {
+    background: red;
+    color: white;
+}
diff --git a/assets/js/script.js b/assets/js/script.js
new file mode 100644
index 0000000..a56a4fb
--- /dev/null
+++ b/assets/js/script.js
@@ -0,0 +1,40 @@
+document.addEventListener('DOMContentLoaded', function () {
+    const buttons = document.querySelectorAll('.like-button');
+
+    buttons.forEach(button => {
+        button.addEventListener('click', function () {
+            const postId = this.getAttribute('data-post-id');
+            const isLiked = this.classList.contains('liked');
+
+            const method = isLiked ? 'DELETE' : 'POST';
+            const endpoint = isLiked ? 'delete' : 'add';
+            const url = `/wp-json/like/v1/${endpoint}`;
+
+            fetch(url, {
+                method: method,
+                headers: {
+                    'Content-Type': 'application/json',
+                    'X-WP-Nonce': wpApiSettings.nonce
+                },
+                body: JSON.stringify({
+                    post_id: postId
+                })
+            })
+            .then(response => {
+                console.log(response);
+                if (!response.ok) {
+                    throw new Error('Erro na requisição');
+                }
+                return response.json();
+            })
+            .then(data => {
+                console.log(data.message);
+                this.classList.toggle('liked', !isLiked);
+                this.textContent = isLiked ? 'Favoritar' : 'Desfavoritar';
+            })
+            .catch(error => {
+                alert('Erro: ' + error.message);
+            });
+        });
+    });
+});
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..1842150
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,13 @@
+{
+    "name": "andre-nascimento/favoritar-posts",
+    "description": "Plugin para favoritar posts no WordPress.",
+    "type": "wordpress-plugin",
+    "autoload": {
+        "psr-4": {
+            "LikePosts\\": "includes/"
+        }
+    },
+    "require": {
+        "php": ">=7.4"
+    }
+}
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..04347f9
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,20 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "071d1dd3227aff23eba292ecd8b541f8",
+    "packages": [],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": ">=7.4"
+    },
+    "platform-dev": [],
+    "plugin-api-version": "2.6.0"
+}
diff --git a/includes/Controllers/LikePostsController.php b/includes/Controllers/LikePostsController.php
new file mode 100644
index 0000000..53681e1
--- /dev/null
+++ b/includes/Controllers/LikePostsController.php
@@ -0,0 +1,93 @@
+<?php
+
+namespace LikePosts\Controllers;
+
+use LikePosts\Models\LikePostsModel;
+use LikePosts\Views\LikePostsView\LikePostsView;
+use WP_REST_Response;
+
+class LikePostsController {
+    private $model;
+    private $view;
+
+    public function __construct() {
+        $this->model = new LikePostsModel();
+        $this->model->create_table();
+        $this->view = new LikePostsView();
+
+        add_action('rest_api_init', [$this, 'register_rest_routes']);      
+        add_action('the_content', [$this, 'add_like_button']);
+        add_action('wp_enqueue_scripts', [$this, 'enqueue_assets']);
+    }
+
+    public function register_rest_routes() {
+        register_rest_route('like/v1', '/add', [
+            'methods' => 'POST',
+            'callback' => [$this, 'like_post'],
+            'permission_callback' => [$this, 'is_user_logged_in']
+        ]);
+
+        register_rest_route('like/v1', '/delete', [
+            'methods' => 'DELETE',
+            'callback' => [$this, 'dislike_post'],
+            'permission_callback' => [$this, 'is_user_logged_in']
+        ]);
+    }
+
+    public function is_user_logged_in() {
+        return is_user_logged_in();
+    }
+
+    public function like_post($request) {
+        $user_id = get_current_user_id();
+        $post_id = intval($request['post_id']);
+
+        if (!$this->is_valid_post($post_id)) {
+            return new WP_REST_Response(['message' => 'Post inválido!'], 400);
+        }
+
+        $this->model->like($user_id, $post_id);
+        return new WP_REST_Response(['message' => 'Post favoritado!'], 200);
+    }
+
+    public function dislike_post($request) {
+        $user_id = get_current_user_id();
+        $post_id = intval($request['post_id']);
+
+        if (!$this->is_valid_post($post_id)) {
+            return new WP_REST_Response(['message' => 'Post inválido!'], 400);
+        }
+
+        $this->model->dislike($user_id, $post_id);
+        return new WP_REST_Response(['message' => 'Post desfavoritado!'], 200);
+    }
+
+
+    public function add_like_button($content) {
+        if (!is_single()) {
+            return $content; 
+        }
+
+        ob_start();
+        $this->view->render(get_the_ID());
+        $button = ob_get_clean();
+
+        return $content . $button;       
+    }
+
+    public function enqueue_assets() {
+        wp_enqueue_style('like-posts-style', plugin_dir_url(__FILE__) . '../../assets/css/style.css');
+        wp_enqueue_script('like-posts-script', plugin_dir_url(__FILE__) . '../../assets/js/script.js', [], time(), true);
+        wp_localize_script('like-posts-script', 'wpApiSettings', [
+            'nonce' => wp_create_nonce('wp_rest')
+        ]);
+    }
+
+    public function has_liked_post($user_id, $post_id){
+        return $this->model->user_has_liked_post($user_id, $post_id);
+    }
+
+    private function is_valid_post($post_id) {
+        return get_post($post_id) !== null;
+    }
+}
diff --git a/includes/Models/LikePostsModel.php b/includes/Models/LikePostsModel.php
new file mode 100644
index 0000000..96bbf88
--- /dev/null
+++ b/includes/Models/LikePostsModel.php
@@ -0,0 +1,68 @@
+<?php
+
+namespace LikePosts\Models;
+
+class LikePostsModel
+{
+    private $table_name;
+
+    public function __construct()
+    {
+        global $wpdb;
+        $this->table_name = $wpdb->prefix . 'most_liked';
+    }
+
+    public function create_table()
+    {
+        global $wpdb;
+
+        $charset_collate = $wpdb->get_charset_collate();
+        $sql = "CREATE TABLE IF NOT EXISTS $this->table_name (
+            id mediumint(9) NOT NULL AUTO_INCREMENT,
+            user_id bigint(20) NOT NULL,
+            post_id bigint(20) NOT NULL,
+            PRIMARY KEY (id),
+            UNIQUE KEY user_post (user_id, post_id)
+        ) $charset_collate;";
+
+        require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
+        dbDelta($sql);
+    }
+
+    public function like($user_id, $post_id)
+    {
+        global $wpdb;
+        $wpdb->insert($this->table_name, [
+            'user_id' => $user_id,
+            'post_id' => $post_id
+        ]);
+    }
+
+    public function dislike($user_id, $post_id)
+    {
+        global $wpdb;
+        $wpdb->delete($this->table_name, [
+            'user_id' => $user_id,
+            'post_id' => $post_id
+        ]);
+    }
+
+    public function user_has_liked_post($user_id, $post_id)
+    {
+        global $wpdb;
+
+        if (!$user_id || !$post_id) {
+            return false;
+        }
+
+        $query = $wpdb->prepare(
+            "SELECT COUNT(*) FROM $this->table_name WHERE user_id = %d AND post_id = %d",
+            $user_id,
+            $post_id
+        );
+
+        $like_count = $wpdb->get_var($query);
+
+        return $like_count > 0;
+    }
+}
diff --git a/includes/Views/AnotherView/.gitkeep b/includes/Views/AnotherView/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/includes/Views/LikePostsView/LikePostsView.php b/includes/Views/LikePostsView/LikePostsView.php
new file mode 100644
index 0000000..faa58db
--- /dev/null
+++ b/includes/Views/LikePostsView/LikePostsView.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace LikePosts\Views\LikePostsView;
+
+use LikePosts\Controllers\LikePostsController;
+
+class LikePostsView
+{
+    public function render($post_id)
+    {
+        $like = new LikePostsController();
+        $has_liked = $like->has_liked_post(get_current_user_id(), $post_id);
+        include plugin_dir_path(__FILE__) . 'template.php';
+    }
+}
diff --git a/includes/Views/LikePostsView/template.php b/includes/Views/LikePostsView/template.php
new file mode 100644
index 0000000..5684f77
--- /dev/null
+++ b/includes/Views/LikePostsView/template.php
@@ -0,0 +1,9 @@
+<?php if (is_user_logged_in()): ?>
+    <button class="like-button <?php echo $has_liked ? 'liked' : ''; ?>" data-post-id="<?php echo esc_attr($post_id); ?>">
+        <?php echo $has_liked ? 'Desfavoritar' : 'Favoritar' ;?>
+    </button>
+<?php else: ?>
+    <p>Você precisa estar logado para curtir este post. 
+        <a href="<?php echo esc_url(wp_login_url(get_permalink($post_id))); ?>">Clique aqui para fazer login</a>.
+    </p>
+<?php endif; ?>
diff --git a/wordpress-back-end-challenge.php b/wordpress-back-end-challenge.php
new file mode 100644
index 0000000..be49e5e
--- /dev/null
+++ b/wordpress-back-end-challenge.php
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * Plugin Name: Favoritar Posts
+ * Description: Permite que usuários logados possam favoritar e desfavoritar posts.
+ * Version: 1.0
+ * Author: André Nascimento
+ */
+
+if (!defined('ABSPATH')) {
+    exit;
+}
+
+require_once plugin_dir_path(__FILE__) . 'vendor/autoload.php';
+
+use LikePosts\Controllers\LikePostsController;
+$like_posts_controller = new LikePostsController();
+