Lesson 2 - Types of APIs, API Styles & Architecture

🚀 Lesson 2: Types of APIs, API Styles & Architecture
Part of the series:
“Building Secure, Scalable, Fault-Tolerant and Low-Latency APIs with Java & Spring Boot.”

In this video, we explore the different types of APIs, their architectural styles, and how real-world production APIs are structured internally. You’ll learn why there is no single best API style, when to use REST vs GraphQL vs gRPC vs WebSockets, and how professional backend systems are designed using layered architecture — not just controllers and endpoints.

This lesson helps you build the correct mental model for designing scalable and maintainable backend systems.

🎯 What you’ll learn in this lesson:

✅ Public APIs, Private APIs, and Partner APIs
✅ When and why each API type is used
✅ REST API fundamentals and limitations
✅ GraphQL: precise data fetching and trade-offs
✅ gRPC for high-performance microservices
✅ WebSockets for real-time communication
✅ Choosing the right API style for your system
✅ Layered API architecture (Controller, Service, Repository)
✅ Why APIs are more than just endpoints
✅ MVC vs Layered Architecture for backend systems
✅ How production APIs scale, remain secure, and stay reliable

You’ll also understand how APIs integrate with databases, caches, message brokers, third-party services, and authentication providers — and why architecture decisions directly affect performance, security, scalability, and fault tolerance.

This video is ideal for:
🎯 Backend developers
🎯 Java & Spring Boot learners
🎯 Software engineering students
🎯 System design interview preparation
🎯 Engineers building production APIs

💬 About the Instructor

Ngane Emmanuel
Backend Engineer | Java & Spring Boot | System Design | API Security

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