Speech to text and Text analysis API

Hi Guys,

We are developing an app. I need suggestions with respect to speech to text and text analysis. Should we integrate third party services to do the speech to text and text analysis at the background? or developing our own engine works? We are of course looking to develop our own engine but finding difficulty in training the model. If you know any third party services which does the speech to text and text analysis, pls let me know. I am also looking for developers to help in developing ML engine.