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Backend-from-first-Principle

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# Backend from First Principles

Welcome to the **Backend from First Principles** documentation repository!

This repository contains a comprehensive collection of notes, code snippets, and explanations covering fundamental and advanced concepts in backend engineering. The goal of this series is to break down complex backend topics into understandable, foundational principles.

## 📚 Table of Contents

The documentation is organized into the following topics:

1. **HTTP and CORS** - Understanding the web's foundational protocol and Cross-Origin Resource Sharing.
2. **Routing in Backend** - How requests are directed to the appropriate handlers.
3. **Serialization and Deserialization** - Converting data structures to/from formats like JSON and Protobuf.
4. **Authentication and Authorization** - Securing applications and managing user access.
5. **Validations and Transformations** - Ensuring data integrity and sanitization.
6. **Controllers, Services, Repositories, and Middlewares** - Exploring the layered architectural pattern and request context.
7. **API Design (REST API)** - Best practices for designing intuitive and scalable RESTful APIs.
8. **Databases** - Core concepts of database integration in backend systems.
9. **Caching** - The secret behind blazingly fast applications (Redis, Memcached, etc.).
10. **Task Queues and Background Jobs** - Managing asynchronous workloads.
11. **Full-Text Search** - Building fast search functionality using Elasticsearch.
12. **Error Handling and Fault-Tolerant Systems** - Building resilient applications that handle failures gracefully.
13. **gRPC and Inter-Service Communication** - Efficient communication protocols for microservices.
14. **Production-Grade Configuration Management** - Managing environment variables and configurations securely.
15. **Logging, Monitoring, and Observability** - Keeping track of system health and debugging issues in production.
16. **Graceful Shutdown** - Safely terminating applications without losing data or interrupting requests.
17. **Backend Security** - Everything you need to know to secure your backend (SQL injection, XSS, CSRF, etc.).
18. **Backend Scaling and Performance Engineering (Part 1)** - Strategies for scaling applications vertically and horizontally.
19. **Backend Scaling and Performance Engineering (Part 2)** - Advanced scaling techniques.
20. **Concurrency & Parallelism** - Understanding IO-bound vs CPU-bound tasks and how to optimize them.
21. **Containerization, Deployment, Docker, Kubernetes, and CI/CD** - Packaging and shipping applications consistently.
22. **Automated Testing** - Writing effective Unit, Integration, and End-to-End (E2E) tests.
23. **Message Brokers and Event Streaming** - Using tools like Kafka for event-driven architectures.
24. **WebSockets and Real-Time Communication** - Building real-time features using WebSockets.

## 🚀 Getting Started

Feel free to browse through the directories to explore specific topics. Each directory contains detailed markdown notes, code examples, and practical implementations.

## 🤝 Contributions

This is a personal reference and documentation repository, but suggestions, corrections, and improvements are always welcome. Feel free to open an issue or submit a pull request!

Backend-from-first-Principle

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