Backend with Spring Boot 4 | Coding Stairs | CodingStairs

Backend with Spring Boot 4

A 7-step path through a real backend — from the first line to auth, tests, and deployment.

Start with Step 1 →

Difficulty: intermediate
Lessons: 7

Why Spring

Java 21 + Spring Boot 4 powers most production Korean backends — strong types, mature ecosystem, proven patterns.

By the end:

Understand multi-module Spring projects
Treat SQL as SSOT, JPA/MyBatis as readers
Design REST APIs to spec
Add JWT authentication
Write integration tests with @SpringBootTest + Testcontainers
Deploy with Docker + Caddy

Flow

[1] What is backend ──▶ [2] First project ──▶ [3] SQL = SSOT ──▶ [4] REST design
                                                                      │
                                                                      ▼
                              [7] Deploy ◀── [6] Testing ◀── [5] JWT auth

Steps 1–4 are how to build it. Steps 5–7 are how to keep it safe and stable.

Prerequisite — getting-started + Java 21 installed.

Lessons

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