How EventBridge, SQS & Lambda Work Together in Your App?

Imagine This Scenario in Your App:
You have 9 microservices, and let’s say you are handling order processing in an e-commerce app.

🛒 User places an order → Now, multiple things need to happen:

• Payment Service needs to charge the user.
• Inventory Service needs to update stock.
• Email Service needs to send a confirmation email.
• Shipping Service needs to prepare the package. How EventBridge, SQS & Lambda Work Together in Your App?

🟢 1️⃣ AWS EventBridge (Real-Time Trigger)

Your Order Service (Node.js microservice) sends an event to EventBridge → "Order Placed".
EventBridge instantly notifies multiple services:

✅ SQS (for payment processing queue)
✅ Lambda (to send order confirmation email)
✅ Inventory Service (to reduce stock)

✅ Why? EventBridge is fast and can notify multiple services at once.

🔵 2️⃣ AWS SQS (Message Queue for Background Tasks)

The Payment Service picks up the message from SQS and processes the payment.
If the Payment Service is too busy, the message waits in the queue until it’s free.
No order is lost, even if the Payment Service crashes or is slow.

✅ Why? SQS queues tasks so they are processed one by one, safely.

🟡 3️⃣ AWS Lambda (For Serverless Tasks)

EventBridge triggers a Lambda function to send the order confirmation email.
Lambda runs only when needed, so you don’t need a separate Email Service in your microservices.

✅ Why? Lambda is lightweight, cost-effective, and doesn’t require a dedicated server.

🔥 Why This is Powerful for Your 9 Microservices?

✔ EventBridge makes microservices communicate efficiently.
✔ SQS ensures tasks are completed even if a service is down.
✔ Lambda runs lightweight background tasks without extra servers.

Now, your Node.js backend is scalable, reliable, and optimized! 🚀🔥

Does this explanation make sense now? 😊