A backend developer builds and maintains the server-side technology, databases, and APIs that power the behind-the-scenes functionality of web applications. They focus on business logic, data storage, security, and performance, ensuring data flows correctly between the user-facing frontend and the server. Core skills include server-side languages (Python, Java, Node.js), database management (SQL/NoSQL), and API development. Key Responsibilities of a Backend DeveloperServer-Side Logic: Creating core application functionality and business logic.Database Management: Designing, managing, and optimizing databases (e.g., PostgreSQL, MySQL, MongoDB) to store and retrieve data securely.API Development: Building RESTful APIs to allow the frontend to interact with the backend.Integration: Connecting external services and managing server interactions.Security & Optimization: Implementing security measures (authentication/authorization) and enhancing application speed.