java software development service in success always depends on yourself

Hello, my father has had his own company for a few years now, and he is currently looking for an expert in Java, Java development and Java software development to hire for an important project in his company. He has tried to search on his own and He has not been able to find one that is reliable and that shows that he has experience in these types of work, that is why he asked me to help him find a java expert. Can anyone here recommend one that has many reviews of your clients to show that you really know what you are doing? thank you so much