MongoDB Planning Schema Review & Redesign

Hi, We are wanting to have our current MongoDB model reviewed and updated. We have a current database used for a mobile application, which I am looking to expand and improve. I will provide documentation to our current model, a background of our application, and what we require our new model to be prepared for. Our current model is simple (5 collections) - I want to improve and expand this a little more but need the help of an expert with experience who can help add new collections and relationships between documents. The result should also be simple and around 10 collections at the most, so should be easy for someone experienced with MongoDB. For confidential reasons, we cannot disclose our schema without an NDA signed, once signed and the project is awarded, I can allow access to a few of our confluence pages to show you our current model - of which you can add your advice and plan the new model with me.