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Software Design Document (SDD)

Project: Modern Personal Finance Website

Version: 1.0

Date: April 26, 2025


1. Overview

This project aims to build a modern, secure, and user-friendly personal finance website that allows users to track expenses, manage budgets, view investments, set savings goals, and get insights into their financial habits.

The website will be responsive, mobile-friendly, and highly secure, with an initial launch focusing on core features and future phases expanding capabilities with smart suggestions, bank integrations, and advanced analytics.


2. Purpose

Provide individuals a centralized platform to:

  • Manage daily expenses
  • Set and track budgets
  • Monitor investments
  • Plan savings goals
  • Receive personalized financial advice

3. Target Audience

  • Individuals aged 20–50
  • Budget-conscious users
  • Young professionals
  • Investors and savers

4. High-Level Features

Feature Description
User Registration/Login Secure account creation, password reset, and email verification
Dashboard Overview Summarized financial health at a glance
Expense Tracking Manual entry and categorization of expenses
Budget Creation and Management Monthly/weekly budget setting and tracking
Investment Portfolio Tracking Manual entry of stocks, crypto, and mutual funds
Savings Goals Set goals (e.g., "Save $5,000 for a trip") and track progress
Reports & Analytics Visual breakdowns (pie charts, line graphs) of financial activities
Notifications & Reminders Alerts for bill due dates, goal milestones, budget overspending
Mobile Responsiveness Fully responsive design (desktop, tablet, mobile)
Security & Data Encryption AES encryption, HTTPS, salted password hashing
Settings Profile management, theme customization, notification preferences
Future Enhancements (Phase 3+) Bank integrations (Plaid API), AI-based budgeting tips, community forums

5. System Architecture

see .rules


6. Detailed Feature Breakdown

6.1 User Registration & Authentication

  • Email/password registration
  • Social login (Phase 2)
  • Forgot password via email
  • Email verification upon signup

6.2 Dashboard Overview

  • Net worth summary (Assets - Liabilities)
  • Recent expenses and budgets overview
  • Quick snapshot of savings goals progress

6.3 Expense Tracker

  • Add, edit, delete expenses
  • Categorization (Food, Travel, Bills, etc.)
  • Tagging and notes for each entry

6.4 Budgeting

  • Create budgets by category (monthly or weekly)
  • View how much is spent vs budgeted in real-time

6.5 Investments Tracking

  • Manual entry of assets (stock/crypto/mutual funds)
  • API integration for live prices (Phase 3)

6.6 Savings Goals

  • Define goal (name, target amount, deadline)
  • Track progress manually or via linked bank accounts (Phase 3)

6.7 Reports and Analytics

  • Monthly breakdowns
  • Pie charts for spending by category
  • Line charts for spending trends over time

6.8 Notifications

  • Upcoming bills, budget overspend, savings goal alerts
  • Configurable via Settings

6.9 Settings and Profile Management

  • Update email/password
  • Enable/disable notifications
  • Dark mode / Light mode

7. Non-Functional Requirements

Requirement Description
Scalability Must support up to 100k users initially
Security HTTPS everywhere, encrypted data at rest
Usability 3-click maximum to access major features
Performance Page load < 2 seconds on mobile
SEO Server-side rendering for landing pages
Accessibility WCAG 2.1 Level AA Compliance

8. Phase-by-Phase Implementation Plan

Phase Focus Timeline Major Deliverables
Phase 1 MVP (Core Platform) 3-4 months - Basic website setup
- User accounts
- Expense tracking
- Budget creation
- Dashboard overview
- Responsive design
Phase 2 Advanced Core + Polish 2-3 months - Savings goals
- Investment tracking (manual)
- Reports and analytics
- Notifications system
- Settings page
- Social login (Google)
Phase 3 API Integrations & AI Insights 4-5 months - Bank account integration via Plaid API
- Auto-expense imports
- AI smart budgeting suggestions
- Live stock/crypto price pulling
Phase 4 Premium & Community Features 3 months - Premium membership (Stripe payment integration)
- User forums or group discussions
- Personalized financial advice features

9. Risk Assessment

Risk Mitigation Strategy
Data Breach Enforce encryption, 2FA (Phase 2), regular audits
Performance Bottlenecks Use CDN, database indexing, load balancing
Compliance Issues (GDPR, CCPA) Privacy policies, opt-in for data sharing
Bank API Dependency Isolate banking features to fail gracefully

10. Future Scalability Options

  • Native mobile apps (React Native or Flutter)
  • AI-driven financial modeling (ML)
  • Marketplace for financial advisors
  • Integration with credit score services (e.g., Experian)

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