[Severun]

Developing an application using Java is not that hard. It's probably the easiest thing in the programming world. You can find a lot of tutorials on Google. Of course, if you don't want to waste your time and get a finished application, it's better to go to a professional. I can highlight orangesoft.co. I'm not sure if they develop in Java, but you can try to contact them. What type of app do you want? Maybe you should try something else? Java is not widely used now.