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, personalized recommendations powered by LLM to improve financial habits.

3. Functional & Non-Functional Requirements

Functional Requirements

• User can sign up and log in securely
• User can add and remove expenses
• User can view all expenses and categorized summaries
• User can see weekly, monthly, and yearly reports with statistics

Non-Functional Requirements

• System should be fault tolerant, scalable, and maintain latency < 100ms
• System should be config-driven to allow fewer code changes
• Code should follow SOLID principles and use proper design patterns for maintainability

4. User Stories.