Game mechanics and slot design play a huge role in the popularity of slot machines. Where can I find specialists who can help create a high-quality product?

I noticed that the slots differ not only in mechanics, but also in design, sound, and effects. This greatly affects the experience of the game. For example, on https://belatragames.com/news/x-towers-game-release I found slots that I really like because they are made with a soul. If you are looking for development specialists, it is probably best to contact those who have already created successful slot machines. Perhaps such companies work with large platforms, and they can be found through open databases or thematic resources.