diff --git a/src/Controller/ExchangeController.php b/src/Controller/ExchangeController.php
new file mode 100644
index 00000000..b21024e2
--- /dev/null
+++ b/src/Controller/ExchangeController.php
@@ -0,0 +1,50 @@
+<?php
+
+/**
+ * PHP version 8.1
+ *
+ * @category Controller
+ * @package  CurrencyExchange
+ * @author   Gustavo de Almeida Oliveira <almdgusta@gmail.com>
+ * @license  MIT <https://opensource.org/licenses/MIT>
+ * @link     https://github.com/almdgustadev/back-end-challenge
+ */
+
+namespace Controller;
+
+require_once __DIR__ . '/../Service/ExchangeService.php';
+
+use Service\ExchangeService;
+
+/**
+ *  Controlador responsável por receber requisições e chamar o serviço de conversão.
+ * 
+ * @category Controller
+ * @package  CurrencyExchange
+ * @author   Gustavo de Almeida Oliveira <almdgusta@gmail.com>
+ * @license  MIT <https://opensource.org/licenses/MIT>
+ * @link     https://github.com/almdgustadev/back-end-challenge
+ */
+
+class ExchangeController
+{
+    /**
+     * Converte um valor de uma moeda para outra.
+     *
+     * @param float  $amount Valor a ser convertido
+     * @param string $from   Moeda de origem (ex: BRL)
+     * @param string $to     Moeda de destino (ex: USD)
+     * @param float  $rate   Taxa de conversão
+     * 
+     * @return array Retorno com valor convertido e símbolo
+     */
+    public function convert(
+        float $amount,
+        string $from,
+        string $to,
+        float $rate
+    ): array {
+        $service = new ExchangeService();
+        return $service->convertCurrency($amount, $from, $to, $rate);
+    }
+}
diff --git a/src/Service/ExchangeService.php b/src/Service/ExchangeService.php
new file mode 100644
index 00000000..c9c312c0
--- /dev/null
+++ b/src/Service/ExchangeService.php
@@ -0,0 +1,59 @@
+<?php
+
+/**
+ * PHP version 8.1
+ *
+ * @category Service
+ * @package  CurrencyExchange
+ * @author   Gustavo de Almeida Oliveira <almdgusta@gmail.com>
+ * @license  MIT <https://opensource.org/licenses/MIT>
+ * @link     https://github.com/almdgustadev/back-end-challenge
+ */
+
+namespace Service;
+
+require_once __DIR__ . '/../Util/CurrencySymbol.php';
+
+use Util\CurrencySymbol;
+
+/**
+ * Serviço responsável pela lógica de conversão de moedas.
+ * 
+ * @category Service
+ * @package  CurrencyExchange
+ * @author   Gustavo de Almeida Oliveira <almdgusta@gmail.com>
+ * @license  MIT <https://opensource.org/licenses/MIT>
+ * @link     https://github.com/almdgustadev/back-end-challenge
+ */
+
+class ExchangeService
+{
+    /**
+     * Converte o valor da moeda para outra utilizando a taxa de câmbio fornecida.
+     *
+     * @param float  $amount Valor a ser convertido.
+     * @param string $from   Moeda de origem.
+     * @param string $to     Moeda de destino.
+     * @param float  $rate   Taxa de câmbio.
+     * 
+     * @return array Resultado da conversão com valor convertido e símbolo da moeda.
+     */
+    public function convertCurrency(
+        float $amount,
+        string $from,
+        string $to,
+        float $rate
+    ): array {
+        if ($rate <= 0) {
+            throw new \InvalidArgumentException('A taxa de câmbio deve ser maior que zero.');
+        }
+        $converted = $amount * $rate;
+
+        $symbol = CurrencySymbol::getSymbol($to);
+
+        return [
+            'valorConvertido' => $converted,
+            'simboloMoeda'    => $symbol,
+            ];
+    }
+}
diff --git a/src/Util/CurrencySymbol.php b/src/Util/CurrencySymbol.php
new file mode 100644
index 00000000..acd38265
--- /dev/null
+++ b/src/Util/CurrencySymbol.php
@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * PHP version 8.1
+ *
+ * @category Util
+ * @package  CurrencyExchange
+ * @author   Gustavo de Almeida Oliveira <almdgusta@gmail.com>
+ * @license  MIT <https://opensource.org/licenses/MIT>
+ * @link     https://github.com/almdgustadev/back-end-challenge
+ */
+
+namespace Util;
+
+/**
+ * Utilitário para obter o símbolo de uma moeda.
+ * 
+ * @category Util
+ * @package  CurrencyExchange
+ * @author   Gustavo de Almeida Oliveira <almdgusta@gmail.com>
+ * @license  MIT <https://opensource.org/licenses/MIT>
+ * @link     https://github.com/almdgustadev/back-end-challenge
+ */
+
+class CurrencySymbol
+{
+    /**
+     * Retorna o símbolo da moeda correspondente ao código fornecido.
+     *
+     * @param string $currency Código da moeda.
+     * 
+     * @return string Símbolo da moeda ou uma string vazia se não encontrado.
+     */
+    public static function getSymbol(string $currency): string
+    {
+        $symbols = [
+            'USD' => '$',
+            'BRL' => 'R$',
+            'EUR' => '€',
+        ];
+
+        return $symbols[$currency] ?? '';
+    }
+}
diff --git a/src/index.php b/src/index.php
index 92841bc8..ba559de6 100644
--- a/src/index.php
+++ b/src/index.php
@@ -2,17 +2,53 @@
 /**
  * Back-end Challenge.
  *
- * PHP version 7.4
+ * PHP version 8.1
  *
  * Este será o arquivo chamado na execução dos testes automátizados.
  *
  * @category Challenge
  * @package  Back-end
- * @author   Seu Nome <seu-email@seu-provedor.com>
+ * @author   Gustavo de Almeida Oliveira <almdgusta@gmail.com>
  * @license  http://opensource.org/licenses/MIT MIT
- * @link     https://github.com/apiki/back-end-challenge
+ * @link     https://github.com/almdgustadev/back-end-challenge
+ *
+ * Ponto de entrada para a aplicação
+ * Roteia a requisição para o controlador de conversão de moedas
  */
-declare(strict_types=1);
 
-require __DIR__ . '/../vendor/autoload.php';
+require_once __DIR__ . '/Controller/ExchangeController.php';
+
+use Controller\ExchangeController;
+
+$uri = $_SERVER['REQUEST_URI'];
+$method = $_SERVER['REQUEST_METHOD'];
+
+$pattern = '#^/exchange/(-?[\d.]+)/([A-Z]{3})/([A-Z]{3})/(-?[\d.]+)$#';
+
+try {
+    if ($method === 'GET' && preg_match($pattern, $uri, $matches)) {
+        $amount = (float) $matches[1];
+        $from   = $matches[2];
+        $to     = $matches[3];
+        $rate   = (float) $matches[4];
+
+        $controller = new ExchangeController();
+        $response   = $controller->convert($amount, $from, $to, $rate);
 
+        http_response_code(200);
+        header('Content-Type: application/json');
+        echo json_encode($response);
+    } else {
+        http_response_code(400);
+        header('Content-Type: application/json');
+        echo json_encode(['error' => 'Rota não encontrada ou inválida']);
+    }
+} catch (\InvalidArgumentException $e) {
+    http_response_code(400);
+    header('Content-Type: application/json');
+    echo json_encode(['error' => $e->getMessage()]);
+} catch (\Throwable $e) {
+    http_response_code(500);
+    header('Content-Type: application/json');
+    echo json_encode(['error' => 'Erro interno no servidor']);
+}
\ No newline at end of file