Have you created or supplemented APIs for integrating new features or expanding existing functionality?

Yes, I have created and enhanced APIs to integrate new features and expand existing functionality. This usually involves:

• Analyzing requirements and designing new endpoints or extending existing ones.
• Implementing controllers, services, and data models.
• Ensuring backward compatibility and documenting changes.

For example, in Java using Spring Boot, you can add a new REST endpoint like this:

@RestController
@RequestMapping("/api/users")
public class UserController {

    @GetMapping("/{id}")
    public ResponseEntity<User> getUserById(@PathVariable Long id) {
        User user = userService.findById(id);
        if (user == null) {
            return ResponseEntity.notFound().build();
        }
        return ResponseEntity.ok(user);
    }

    // Adding a new method for updating a user
    @PutMapping("/{id}")
    public ResponseEntity<User> updateUser(@PathVariable Long id, @RequestBody User updatedUser) {
        User user = userService.update(id, updatedUser);
        if (user == null) {
            return ResponseEntity.notFound().build();
        }
        return ResponseEntity.ok(user);
    }
}

This approach allows expanding the API without breaking existing functionality.