Design Mint.com

Step 1: Outline use cases and constraints

Use cases

We'll scope the problem to handle only the following use cases

Out of scope

Constraints and assumptions

State assumptions

Calculate usage

Step 2: Create a high level design

Step 3: Design core components

Use case: User connects to a financial account

Use case: Service extracts transactions from the account

Category service

Use case: Service recommends a budget

Step 4: Scale the design

Additional talking points

NoSQL

Caching

Asynchronism and microservices

Communications

Security

Latency numbers

Ongoing