diff --git a/openapi.yml b/openapi.yml
new file mode 100644
index 0000000..1736832
--- /dev/null
+++ b/openapi.yml
@@ -0,0 +1,59 @@
+openapi: 3.0.3
+info:
+  title: swisssign-challenge - dlmw
+  description: |-
+    This is the documentation for the SwissSign Challenge API.
+  termsOfService: ""
+  contact:
+    email: dylan@dlmw.ch
+  license:
+    name: GNU General Public License Version 3
+    url: https://www.gnu.org/licenses/gpl-3.0.txt
+  version: 0.0.1
+externalDocs:
+  description: ""
+  url: ""
+servers:
+  - url: ""
+tags:
+  - name: hello
+    description: ""
+
+paths:
+  /hello:
+    get:
+      tags:
+        - hello
+      summary: Get a hello from me
+      operationId: getHello
+      responses:
+        200:
+          description: "Hello"
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/HelloResponse"
+
+components:
+  schemas:
+    HelloResponse:
+      type: object
+      properties:
+        value:
+          type: string
+
+    ErrorResponse:
+      type: object
+      required:
+        - message
+        - code
+      properties:
+        message:
+          type: string
+          description: Human-readable error message
+        code:
+          type: integer
+          description: Machine-readable error code
+        details:
+          type: object
+          description: Additional error details when available
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index 74b4e70..fef0f04 100644
--- a/pom.xml
+++ b/pom.xml
@@ -49,6 +49,31 @@
             <artifactId>postgresql</artifactId>
             <scope>runtime</scope>
         </dependency>
+        <dependency>
+            <groupId>jakarta.validation</groupId>
+            <artifactId>jakarta.validation-api</artifactId>
+            <version>3.0.2</version>
+        </dependency>
+        <dependency>
+            <groupId>jakarta.persistence</groupId>
+            <artifactId>jakarta.persistence-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.swagger.core.v3</groupId>
+            <artifactId>swagger-annotations</artifactId>
+            <version>2.2.28</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.2.6</version>
+        </dependency>
+        <dependency>
+            <groupId>io.swagger.core.v3</groupId>
+            <artifactId>swagger-models</artifactId>
+            <version>2.2.28</version>
+        </dependency>
+
 
         <dependency>
             <groupId>org.projectlombok</groupId>
@@ -110,6 +135,28 @@
                     </excludes>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.openapitools</groupId>
+                <artifactId>openapi-generator-maven-plugin</artifactId>
+                <version>7.11.0</version>
+                <executions>
+                    <execution>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>generate</goal>
+                        </goals>
+                        <configuration>
+                            <inputSpec>${project.basedir}/openapi.yml</inputSpec>
+                            <generatorName>spring</generatorName>
+                            <configOptions>
+                                <interfaceOnly>true</interfaceOnly>
+                                <useSpringBoot3>true</useSpringBoot3>
+                                <sourceFolder>src/gen/java/main</sourceFolder>
+                            </configOptions>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 
diff --git a/src/main/java/ch/dlmw/swisssignchallenge/controllers/HelloController.java b/src/main/java/ch/dlmw/swisssignchallenge/controllers/HelloController.java
new file mode 100644
index 0000000..6bb6aed
--- /dev/null
+++ b/src/main/java/ch/dlmw/swisssignchallenge/controllers/HelloController.java
@@ -0,0 +1,14 @@
+package ch.dlmw.swisssignchallenge.controllers;
+
+import org.openapitools.api.HelloApi;
+import org.openapitools.model.HelloResponse;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Controller;
+
+@Controller
+public class HelloController implements HelloApi {
+    @Override
+    public ResponseEntity<HelloResponse> getHello() {
+        return ResponseEntity.ok(new HelloResponse().value("Hello, world"));
+    }
+}