Make architecture as below: 1. Use common code where even possible like for crud operation a single class that handle operation based on entity provided(Dapper.

Make architecture as below: 1. Use common code where even possible like for crud operation a single class that handle operation based on entity provided(Dapper.Exention library for .net ORM). 2. Try to create code generator using templates. 3. Use common and well known libraries to manage common operation like logging, mail sending etc put those in sub project - in case need to change library just a sub project require changes.