Software Development Lifecycle (SDLC): End-to-End Overview

What is High-Level Design?

High-Level Design (HLD) describes the overall system architecture and major components of the system.

It provides a big-picture view of how the system will function.

HLD focuses on modules and interactions, not detailed logic.

Key Components of HLD

• 1. System architecture diagram
• 2. Description of system modules
• 3. Data flow between modules
• 4. Technology stack
• 5. Integration points with external systems

Example HLD for an LMS System

1. User Management

2. Course Management

3. Payment System

4. Content Delivery

5. Notifications

Who Creates HLD?

• 1. System Architects
• 2. Senior Developers
• 3. Technical Leads
• 4. Business analysts

Benefits of HLD

1. Provides clear architecture overview

2. Helps teams understand system structure

3. Reduces confusion during development

4. Helps estimate development effort