Last Updated: November 21, 2025
Serverless Architecture
Building serverless applications
Serverless Concepts
| Item | Description |
|---|---|
Function as a Service (FaaS)
|
Run code without servers |
Event-driven
|
Functions triggered by events |
Auto-scaling
|
Automatic resource scaling |
Pay-per-use
|
Only pay for execution time |
Stateless
|
Functions don't maintain state |
AWS Lambda Function
exports.handler = async (event) => {
console.log('Event:', JSON.stringify(event));
const body = JSON.parse(event.body);
// Process data
const result = {
message: 'Success',
data: body
};
return {
statusCode: 200,
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify(result)
};
};Common Triggers
- API Gateway: HTTP requests
- S3 Events: File uploads
- DynamoDB Streams: Database changes
- SNS/SQS: Message queues
- CloudWatch Events: Scheduled jobs
- EventBridge: Custom events
Best Practices
- Keep functions small and focused
- Use environment variables for config
- Implement proper error handling
- Optimize cold start times
- Use layers for shared dependencies
- Monitor with CloudWatch Logs
💡 Pro Tips
Quick Reference
Build scalable serverless applications