diff --git a/composer b/composer
new file mode 100755
index 00000000..3d1b9838
Binary files /dev/null and b/composer differ
diff --git a/composer.json b/composer.json
index ce7dfb19..7988dae1 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,9 @@
   },
   "autoload": {
     "psr-4": {
-      "App\\": "src/"
+      "App\\": "src/",
+      "App\\Classes\\": "src/class/",
+      "App\\Routers\\": "src/router/"
     }
   }
 }
diff --git a/src/class/CurrencyConverter.php b/src/class/CurrencyConverter.php
new file mode 100644
index 00000000..cdc9fb08
--- /dev/null
+++ b/src/class/CurrencyConverter.php
@@ -0,0 +1,74 @@
+<?php
+/**
+ * Back-end Challenge.
+ *
+ * PHP version 7.4
+ *
+ * @category Challenge
+ * @package  Back-end
+ * @author   João Paulin <ppaulin23@hotmail.com>
+ * @license  http://opensource.org/licenses/MIT MIT
+ * @link     https://github.com/joaopaulin/back-end-challenge
+ */
+declare(strict_types=1);
+
+namespace App\Classes;
+
+/**
+ * Classe CurrencyConverter.
+ *
+ * PHP version 7.4
+ *
+ * Gerencia a lógica de conversão de moedas e o mapeamento de símbolos.
+ *
+ * @category Challenge
+ * @package  Back-end
+ * @author   João Paulin <ppaulin23@hotmail.com>
+ * @license  http://opensource.org/licenses/MIT MIT
+ * @link     https://github.com/joaopaulin/back-end-challenge
+ */
+class CurrencyConverter
+{
+    private const SYMBOLS = [
+        'BRL' => 'R$',
+        'USD' => '$',
+        'EUR' => '€'
+    ];
+
+    /**
+     * Converte um valor com base em uma taxa fornecida.
+     * 
+     * @param float $amount Valor a ser convertido.
+     * @param float $rate   Taxa de conversão.
+     *
+     * @return float
+     */
+    public function convert(float $amount, float $rate): float
+    {
+        return $amount * $rate;
+    }
+
+    /**
+     * Retorna o símbolo para um determinado código de moeda.
+     * 
+     * @param string $currencyCode Código da moeda (BRL, USD, EUR).
+     *
+     * @return string
+     */
+    public function getSymbol(string $currencyCode): string
+    {
+        return self::SYMBOLS[$currencyCode] ?? '';
+    }
+
+    /**
+     * Valida se o código da moeda é suportado e está em letras maiúsculas.
+     * 
+     * @param string $currencyCode Código da moeda.
+     *
+     * @return bool
+     */
+    public function isValidCurrency(string $currencyCode): bool
+    {
+        return isset(self::SYMBOLS[$currencyCode]);
+    }
+}
diff --git a/src/index.php b/src/index.php
index 92841bc8..d9915b5b 100644
--- a/src/index.php
+++ b/src/index.php
@@ -8,11 +8,16 @@
  *
  * @category Challenge
  * @package  Back-end
- * @author   Seu Nome <seu-email@seu-provedor.com>
+ * @author   João Paulin <ppaulin23@hotmail.com>
  * @license  http://opensource.org/licenses/MIT MIT
- * @link     https://github.com/apiki/back-end-challenge
+ * @link     https://github.com/joaopaulin/back-end-challenge
  */
 declare(strict_types=1);
 
 require __DIR__ . '/../vendor/autoload.php';
 
+use App\Routers\Router;
+
+$router = new Router();
+$router->handleRequest();
+
diff --git a/src/router/Router.php b/src/router/Router.php
new file mode 100644
index 00000000..f61e0069
--- /dev/null
+++ b/src/router/Router.php
@@ -0,0 +1,109 @@
+<?php
+/**
+ * Back-end Challenge.
+ *
+ * PHP version 7.4
+ *
+ * @category Challenge
+ * @package  Back-end
+ * @author   João Paulin <ppaulin23@hotmail.com>
+ * @license  http://opensource.org/licenses/MIT MIT
+ * @link     https://github.com/joaopaulin/back-end-challenge
+ */
+declare(strict_types=1);
+
+namespace App\Routers;
+
+use App\Classes\CurrencyConverter;
+
+/**
+ * Classe Router.
+ *
+ * PHP version 7.4
+ *
+ * Responsável por gerenciar as rotas e despachar para o conversor de moedas.
+ *
+ * @category Challenge
+ * @package  Back-end
+ * @author   João Paulin <ppaulin23@hotmail.com>
+ * @license  http://opensource.org/licenses/MIT MIT
+ * @link     https://github.com/joaopaulin/back-end-challenge
+ */
+class Router
+{
+    /**
+     * Lida com a requisição atual.
+     * 
+     * @return void
+     */
+    public function handleRequest(): void
+    {
+        // Define o cabeçalho JSON
+        header('Content-Type: application/json');
+
+        // Obtém a URI da requisição
+        $request_uri = $_SERVER['REQUEST_URI'];
+        $path = parse_url($request_uri, PHP_URL_PATH);
+        $pathParts = explode('/', trim($path, '/'));
+
+        if (count($pathParts) < 4) {
+            $this->_sendErrorResponse();
+        }
+
+        // Se a primeira parte for 'exchange', remove-a
+        if ($pathParts[0] === 'exchange') {
+            array_shift($pathParts);
+        }
+
+        // Verifica se temos partes suficientes (amount, from, to, rate)
+        if (count($pathParts) !== 4) {
+            $this->_sendErrorResponse();
+        }
+
+        [$amountRaw, $from, $to, $rateRaw] = $pathParts;
+
+        // Validação básica
+        if (!is_numeric($amountRaw) || !is_numeric($rateRaw)) {
+            $this->_sendErrorResponse();
+        }
+
+        $amount = (float) $amountRaw;
+        $rate = (float) $rateRaw;
+
+        if ($amount < 0 || $rate < 0) {
+            $this->_sendErrorResponse();
+        }
+
+        $converter = new CurrencyConverter();
+
+        if (!$converter->isValidCurrency($from) 
+            || !$converter->isValidCurrency($to)
+        ) {
+            $this->_sendErrorResponse();
+        }
+
+        // Executa a conversão e mapeia símbolo
+        $convertedValue = $converter->convert($amount, $rate);
+        $symbol = $converter->getSymbol($to);
+
+        // Resposta de Sucesso
+        echo json_encode(
+            [
+                'valorConvertido' => $convertedValue,
+                'simboloMoeda' => $symbol
+            ]
+        );
+    }
+
+    /**
+     * Envia uma resposta de erro 400.
+     * 
+     * @return void
+     */
+    private function _sendErrorResponse(): void
+    {
+        http_response_code(400);
+        echo json_encode(['error' => 'Requisicao Invalida']);
+        exit;
+    }
+}