This project should be easy for anyone knowing this stuff.
Create a free account in Mlab and in MongoDB Atlas and use the sample code that comes with the latest ver of Delphi Mongo_Explore.dproj. Add 2 buttons one to connect to the mLab account and one to connect to MongoDB Atlas.
Don't bill more than $50 for this, if you are the guy I may have some other Mongo work coming up in Delphi.
Include the word "BlueMagic" in your offer