How important is product testing?

Everyone says that testing a product is a very important stage of development, and I don't understand if I contact the developers if this stage is included in the overall process. Or do I need to hire additional specialists?

Well, I have always believed that testing of the finished product should be included in the full cycle development process.

It also seems to me that this stage should be included in a full-fledged software and application development process, but in any case, you can hire qa testers. Finding proven specialists is now quite simple, and you can leave this task to Binary Studio. This is a great way to expand an already existing development team by finding top specialists.