: Designing a chat app's HLD involves defining the Messaging Service, User Database, and Notification System. Low-Level Design (LLD): The Micro View
: Overall system architecture, technology stack, and major modules (e.g., Database, UI, Security). SDLC: - Software Development Life Cycle HLD LLD
The of the Software Development Life Cycle (SDLC) is where business requirements are transformed into a technical blueprint . This phase is split into two critical stages: High-Level Design (HLD) and Low-Level Design (LLD) . High-Level Design (HLD): The Macro View : Designing a chat app's HLD involves defining
HLD serves as the architectural roadmap, defining "what" the system will do and how its major parts connect. This phase is split into two critical stages:
LLD provides the detailed "how" of the system, acting as a direct guide for developers to write code.
: Internal logic of individual components, including classes, methods, data structures, and specific algorithms. Responsibility : Created by Designers and Developers . Input : The approved High-Level Design.
: Typically created by Solution Architects or senior developers. Input : Software Requirement Specification (SRS).