Using Nullable type

EmployeeService.kt

fun findEmployeeByName(name: String): Either<Problem, Employee?> {
        val request = Request(Method.GET, "http://myservice.org/employees").query("name", name)
        val response = client(request)
        return when (response.status) {
            Status.OK -> Employee(response.bodyString()).right()
            Status.NOT_FOUND -> Either.Right<Employee?>(null)
            else -> HttpFailureProblem("Http call failed due to ${response.bodyString()}").left()
        }
    }