Developer Requirements

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1. Introduction

This document outlines all the technical and functional requirements that are necessary for the development of a new software application or system. By doing so, it guarantees that every stakeholder involved in the project, from developers and project managers to end users and investors, possesses a clear and unified comprehension of the project's objectives, scope, and expected deliverables.

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2. Project Overview

2.1 Project Description

A. Objective: Develop a mobile application to manage personal finances. The app will offer expense tracking, budget management, financial reporting, and integration with bank accounts for automatic transaction imports.

B. Background: Existing finance management tools are either too complex or lack essential features. This application aims to provide a simplified, user-friendly experience that addresses these gaps.

C. Stakeholders:

• End Users: Individuals looking for efficient personal finance management.

• Project Sponsors: Financial technology firm funding the development.

• Development Team: Comprising software engineers, UX/UI designers, quality assurance testers, and product managers.

2.2 Scope

A. Inclusions:

• Secure user registration and login functionalities

• Comprehensive expense tracking and categorization

• Budget creation and monitoring features

• Detailed financial reporting and analytics

• Integration with external banking services for transaction data import

B. Exclusions:

• Investment tracking

• Tax computation functionalities

C. Deliverables:

• Fully functional mobile application for iOS and Android platforms

• User and technical documentation

• Deployment and support plan

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3. Functional Requirements

3.1 User Requirements

User Stories

• As a user, I want to securely register and log in, so that I can access my personal finance data safely.

• As a user, I want to categorize my expenses, so that I can analyze my spending patterns.

• As a user, I want to set and track budgets, so that I can manage my finances within defined limits.

Use Cases

Use Case ID	Description	Actors	Preconditions	Postconditions
UC001	Enables new users to create an account.	User, System	None	User account is created
UC002	Allows registered users to access their accounts.	User, System	The user must be registered	User is logged in
UC003	Users can enter and categorize their expenses.	User, System	User must be logged in	Expense entry is recorded and categorized
UC004	Users can create and manage budgets.	User, System	User must be logged in	Budget is set up and monitored
UC005	Users can generate and download financial reports.	User, System	User must have recorded transactions	Report is generated and available for download

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4. Technical Requirements

4.1 System Architecture

• Frontend: Built using React Native to ensure cross-platform compatibility for iOS and Android devices.

• Backend: RESTful API developed with Node.js and Express to handle business logic and data operations.

• Database: PostgreSQL is used for robust and scalable data storage.

External Services:

• Plaid for integrating with bank accounts and fetching transaction data.

• Stripe for secure payment processing.

4.2 Technology Stack

Component	Description	Technology	Version
Frontend	Mobile application interface	React Native	0.71.0
Backend	Server-side logic and API	Node.js, Express	18.x
Database	Structured data storage	PostgreSQL	14.x
External Services	Integration with financial services	Plaid, Stripe	-
Deployment	Application deployment and cloud services	Docker, AWS	-
Testing	Testing frameworks and tools	Jest, Mocha	28.x

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5. Performance Requirements

• Response Time: The application must respond to user actions within 1 second to ensure a smooth user experience.

• Throughput: The system should support up to 1000 concurrent users without significant performance degradation.

• Scalability: The system architecture must support horizontal scaling to handle increasing user loads seamlessly.

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6. Security Requirements

• Data Encryption: Implement AES-256 encryption for data at rest and TLS 1.2 or higher for data in transit.

• Access Control: Use Role-Based Access Control (RBAC) to enforce least privilege access principles.

• Authentication: Support OAuth 2.0 for secure user authentication and authorization.

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7. User Interface Requirements

7.1 UI/UX Design

• Consistency: Ensure a cohesive design throughout the application with consistent color schemes, typography, and button styles.

• Accessibility: Design the application to be accessible, including support for screen readers and high-contrast modes for users with visual impairments.

• Responsiveness: Optimize the user interface for various screen sizes and orientations to provide a seamless experience across different devices.

7.2 Wireframes and Mockups

• Login Screen: Includes fields for username and password, with additional options for password recovery and user registration.

• Dashboard: Displays a summary of key financial metrics, recent transactions, and budget status in a clear, user-friendly layout.

• Expense Entry: Features a form for inputting expense details, including amount, category, and notes, with an intuitive submit button.

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8. Integration Requirements

8.1 External Interfaces

• Payment Gateway: Integrate with Stripe to handle secure transactions and payments.

• Email Service: Use SendGrid for sending automated transactional and promotional emails.

• Bank Integration: Implement Plaid API to allow users to import transactions directly from their bank accounts.

8.2 API Specifications

API Endpoint	Description	Method	Response Format	Authentication
/api/login	User authentication	POST	JSON	OAuth 2.0
/api/expenses	Adding and retrieving expenses	POST/GET	JSON	Bearer Token
/api/budgets	Creating and managing budgets	POST/GET	JSON	Bearer Token
/api/reports	Generating and downloading financial reports	GET	PDF	Bearer Token

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9. Testing Requirements

9.1 Testing Strategy

• Unit Testing: Test individual components to verify their functionality.

• Integration Testing: Ensure that integrated components work together as expected.

• System Testing: Conduct end-to-end testing of the complete system to validate overall functionality.

• User Acceptance Testing (UAT): Engage actual users to validate that the system meets their needs and expectations.

9.2 Acceptance Criteria

• Functionality: All functional requirements must be correctly implemented and tested.

• Performance: The application must meet established performance benchmarks.

• Security: The system must adhere to security standards and pass all relevant security tests.

• Usability: The user interface must be intuitive, user-friendly, and offer a positive user experience.

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10. Deliverables

• Technical Documentation: Comprehensive documentation covering system architecture, API specifications, and integration details.

• User Manuals: Detailed guides for end-users, including setup instructions and troubleshooting tips.

• Final Release: A complete, fully functional mobile application available for download on iOS and Android platforms, along with deployment and support plans.

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