MongoDB Schema and Structure Design

Looking for an experienced MongoDB expert to help in the design of a MongoDB schema and decide the structure for it for a MEAN stack application. Multi Database structures being explored. Schema needs to be optimised to better support fast queries and be efficient, as some amount of relational data is present. A few NoSQL join queries may need guidance to work with this new structure. Experience in MongoDB schema design, NoSQL queries, and general design and deployment of MongoDB for multiple large scale commercial projects, across cloud providers, would be useful.