Add Fields to User Profiles

I need help modifying the data layer of my existing web application. Specifically, I want new or updated data fields added to the customer / user profile area. This is strictly about website or app data—no spreadsheets, external reports, or dashboards... (Budget: ₹12500 - ₹37500 INR, Jobs: API Development, C# Programming, MySQL, NoSQL Couch & Mongo, PHP, User Interface / IA)