Expense Tracker System.

1. Problem

• People often struggle to track their daily expenses, which leads to poor visibility into where their money goes.
• Without a simple system to manage spending, it becomes difficult to make informed financial decisions.

2. Solution

A user-friendly app that allows people to log, categorize, and visualize their expenses—while also providing smart, personalised recommendations powered by LLM to improve financial habits.

3. Functional & Non-Functional Requirements

Functional :

• User is able to Login and Sign Up
• User is able to add/remove the expense.
• User is able to see his expense, categorized expenses
• User is able to see weekly, monthly, yearly report and statistics about the spendings.

Non-Functional:

• System needs to be fault tolerant, scalable and latency < 100ms
• Config driven system if possible to accommodate less code changes in the future
• Code should be follow SOLID principles and appropriate design Patterns for maintainability.

3. User Stories