Software Development Life Cycle (SDLC)

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The Software Development Life Cycle (SDLC) is a structured process used to plan, design, develop, test, deploy, and maintain software. It ensures a systematic workflow and helps align software development with business goals and user requirements.

Provides a clear and organized framework for managing development phases
Helps in early detection of defects, reducing overall cost and time
Ensures high-quality software delivery that meets user expectations

Stage 1: Planning & Feasibility Analysis
This stage determines whether the project is technically, financially, and operationally feasible.

Activities: Feasibility analysis, cost estimation, scheduling, resource planning
Output: Project Plan, Feasibility Report
Key Roles: Project Managers, Senior Engineers, Stakeholders

Stage 2: Requirement Specification (SRS)
In this stage, detailed functional and non-functional requirements are documented clearly and approved by stakeholders.

Activities: Requirement gathering, validation, documentation
Output: Software Requirement Specification (SRS)
Key Roles: Business Analysts, Product Owners

Stage 3: System Design
In this stage, the approved requirements are transformed into a technical blueprint for implementation.

High-Level Design (HLD): Defines system architecture, technology stack, database design, and major modules.
Low-Level Design (LLD): Specifies component logic, APIs, data structures, and workflows.
Output: Design Document Specification (DDS)

Stage 4: Development (Coding)
Developers build the software based on the approved design.

Activities: Coding, code reviews, unit testing, version control management
Tools: IDEs, version control systems, debuggers
Output: Source code, executable application
Key Roles: Frontend, Backend, Full Stack Developers

Stage 5: Testing
Testing ensures the software meets requirements and is free from defects before release.

Types of Testing include:

Unit Testing: Verifies individual components
Integration Testing: Ensures modules work together
System Testing: Validates the complete system
User Acceptance Testing (UAT): Confirms business requirements are met
Output: Test cases, defect reports, and quality metrics.

Stage 6: Deployment
The tested software is released to users.

Activities: Production setup, deployment, smoke testing
Modern Approach: Continuous Integration and Continuous Deployment (CI/CD) pipelines for faster and reliable releases
Output: Live application
Key Roles: DevOps Engineers, Release Managers