diff --git a/src/StimulusBundle/src/Builder/StimulusAttributeBuilder.php b/src/StimulusBundle/src/Builder/StimulusAttributeBuilder.php
new file mode 100644
index 00000000000..24553b174dc
--- /dev/null
+++ b/src/StimulusBundle/src/Builder/StimulusAttributeBuilder.php
@@ -0,0 +1,162 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\UX\StimulusBundle\Builder;
+
+use Symfony\UX\StimulusBundle\Helper\StimulusSyntaxHelper;
+
+class StimulusAttributeBuilder
+{
+    private string $controllerName;
+    private array $actions = [];
+    private array $values = [];
+    private array $classes = [];
+    private array $targets = [];
+    private array $outlets = [];
+    private array $attributes = [];
+
+    public static function controller(string $controllerName): self
+    {
+        $builder = new self();
+        $builder->controllerName = $controllerName;
+
+        return $builder;
+    }
+
+    public function action(string $actionName, ?string $eventName = null, array $parameters = []): self
+    {
+        $this->actions[] = [
+            'actionName' => $actionName,
+            'eventName' => $eventName,
+            'parameters' => $parameters,
+        ];
+
+        return $this;
+    }
+
+    public function value(string $key, mixed $value): self
+    {
+        $this->values[$key] = $value;
+
+        return $this;
+    }
+
+    public function class(string $key, mixed $value): self
+    {
+        $this->classes[$key] = $value;
+
+        return $this;
+    }
+
+    public function target(string $key, mixed $value): self
+    {
+        $this->targets[$key] = $value;
+
+        return $this;
+    }
+
+    public function outlet(string $identifier, string $outlet, mixed $selector): self
+    {
+        $this->outlets[] = [
+            'identifier' => $identifier,
+            'outlet' => $outlet,
+            'selector' => $selector,
+        ];
+
+        return $this;
+    }
+
+    public function build(): array
+    {
+        $syntaxHelper = new StimulusSyntaxHelper();
+        $controllerName = $syntaxHelper->normalizeControllerName($this->controllerName);
+
+        $this->attributes['data-controller'] = $controllerName;
+
+        // Actions
+        $this->attributes = array_merge(
+            $this->attributes,
+            ...array_map(function (array $actionData) use ($controllerName): array {
+                $actionName = htmlspecialchars($actionData['actionName']);
+                $eventName = $actionData['eventName'];
+
+                $action = \sprintf('%s#%s', $controllerName, $actionName);
+                if (null !== $eventName) {
+                    $action = \sprintf('%s->%s', htmlspecialchars($eventName), $action);
+                }
+
+                return ['data-action' => $action];
+            }, $this->actions)
+        );
+
+        // Action Parameters
+        $this->attributes = array_merge(
+            $this->attributes,
+            ...array_map(
+                function (array $actionData) use ($controllerName, $syntaxHelper): array {
+                    $parameters = [];
+
+                    foreach ($actionData['parameters'] as $name => $value) {
+                        $key = $syntaxHelper->normalizeKeyName($name);
+                        $value = $syntaxHelper->getFormattedValue($value);
+
+                        $parameters[\sprintf(
+                            'data-%s-%s-param',
+                            $controllerName,
+                            $key
+                        )] = htmlspecialchars($value);
+                    }
+
+                    return $parameters;
+                },
+                $this->actions
+            )
+        );
+
+        // Values
+        foreach ($this->values as $key => $value) {
+            if (null === $value) {
+                continue;
+            }
+
+            $key = $syntaxHelper->normalizeKeyName($key);
+            $value = $syntaxHelper->getFormattedValue($value);
+
+            $this->attributes[\sprintf('data-%s-%s-value', $controllerName, $key)] = $value;
+        }
+
+        // Classes
+        foreach ($this->classes as $key => $class) {
+            $key = $syntaxHelper->normalizeKeyName($key);
+
+            $this->attributes[\sprintf('data-%s-%s-class', $controllerName, $key)] = $class;
+        }
+
+        // Outlets
+        foreach ($this->outlets as $outletItem) {
+            $identifier = $syntaxHelper->normalizeControllerName($outletItem['identifier']);
+            $outlet = $syntaxHelper->normalizeKeyName($outletItem['outlet']);
+
+            $this->attributes[\sprintf('data-%s-%s-outlet', $identifier, $outlet)] = htmlspecialchars(
+                $outletItem['selector']
+            );
+        }
+
+        // Targets
+        foreach ($this->targets as $key => $target) {
+            $key = $syntaxHelper->normalizeKeyName($key);
+
+            $this->attributes[\sprintf('data-%s-target', $key)] = htmlspecialchars($target);
+        }
+
+        return $this->attributes;
+    }
+}
diff --git a/src/StimulusBundle/src/Helper/StimulusSyntaxHelper.php b/src/StimulusBundle/src/Helper/StimulusSyntaxHelper.php
new file mode 100644
index 00000000000..f5237bd452f
--- /dev/null
+++ b/src/StimulusBundle/src/Helper/StimulusSyntaxHelper.php
@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\UX\StimulusBundle\Helper;
+
+class StimulusSyntaxHelper
+{
+    public function normalizeControllerName(string $controllerName): string
+    {
+        return preg_replace('/^@/', '', str_replace('_', '-', str_replace('/', '--', $controllerName)));
+    }
+
+    public function normalizeKeyName(string $str): string
+    {
+        // Adapted from ByteString::camel
+        $str = ucfirst(str_replace(' ', '', ucwords(preg_replace('/[^a-zA-Z0-9\x7f-\xff]++/', ' ', $str))));
+
+        // Adapted from ByteString::snake
+        return strtolower(preg_replace(['/([A-Z]+)([A-Z][a-z])/', '/([a-z\d])([A-Z])/'], '\1-\2', $str));
+    }
+
+    public function getFormattedValue(mixed $value): string
+    {
+        if ($value instanceof \Stringable || (\is_object($value) && \is_callable([$value, '__toString']))) {
+            $value = (string) $value;
+        } elseif (!\is_scalar($value)) {
+            $value = json_encode($value);
+        } elseif (\is_bool($value)) {
+            $value = $value ? 'true' : 'false';
+        }
+
+        return (string) $value;
+    }
+}