Build an SMS Alert System in Spring Boot (Step-by-Step Guide for Java Developers)

Ever wished your application could automatically notify users via SMS whenever something important happens?
Maybe an OTP, order update, or alert message? In this guide, we’ll walk through building a simple yet powerful SMS Alert System using Spring Boot — step by step.

🚀 Why Build an SMS Alert System?

SMS alerts are still one of the most effective ways to reach users instantly.
They’re used for:

• OTP (One-Time Passwords)
• Order status updates
• Security alerts
• Payment confirmations
• Emergency notifications

With Spring Boot, integrating SMS is easier than ever — thanks to clean dependency management, simple configuration, and powerful REST API support.

🧩 What We’ll Build

We’ll create a Spring Boot REST API that can:

• Accept a message and a phone number.
• Send an SMS using an external SMS provider (like Twilio or Fast2SMS).
• Return a success/failure response.

🛠️ Step 1: Set Up Your Spring…