Serverless Event Registration & Notification System on AWS🚀

A serverless event registration system using AWS Lambda, API Gateway, S3, DynamoDB, and SNS to automate registrations, document storage, and email notifications.

SRI GANTH K

Published Aug 26, 2026

Last modified Aug 26, 2026

🚀 IntroductionI built a Serverless Event Registration System to collect participant information, handle document uploads, store registration data, and notify event organisers.
The project helped me understand how AWS managed services can work together to build a complete serverless application without maintaining traditional backend servers.
The application uses Amazon API Gateway, AWS Lambda, Amazon S3, Amazon DynamoDB, Amazon SNS, AWS IAM, and Amazon CloudWatch.
The complete source code is available on GitHub:
 Registration Notification System — GitHub 
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📝 What I BuiltThe application provides a web-based event registration form where participants can submit their information and upload supporting documents.
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A participant can:
Enter registration details
Upload a supported document
Submit the registration
Receive a unique registration ID
The system then:
Stores the document in Amazon S3
Stores registration data in DynamoDB
Sends an email through Amazon SNS
Records logs in CloudWatch
The entire backend workflow is serverless, with no traditional application or database server to maintain.
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🛠️ Technology StackPlain text
Frontend       → HTML + CSS + JavaScript
API            → Amazon API Gateway
Backend        → AWS Lambda
File Storage   → Amazon S3
Database       → Amazon DynamoDB
Notification   → Amazon SNS
Security       → AWS IAM
Monitoring     → Amazon CloudWatch
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🏗️ ArchitectureThe core request flow is:
Participant → API Gateway → Lambda → S3 + DynamoDB + SNS
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Lambda validates the request, generates the registration ID, uploads the document, stores the registration data, and sends the notification.
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🔗 How the AWS Services Work TogetherAmazon API GatewayProvides the REST API endpoint:
Plain text
POST /register
It receives the request from the frontend and invokes Lambda.
AWS LambdaThe  EventRegistrationBackend  function, implemented using Python 3.12, contains the backend logic.
It validates requests, generates registration IDs, uploads documents, stores data, and publishes notifications.
Amazon S3Stores uploaded documents using a structure such as:
Plain text
{department}/REG-XXXXXX_filename.pdf
Amazon DynamoDBStores participant and registration information in the  EventRegistrations  table.
The registration ID is used as the partition key.
Amazon SNSSends organiser notifications after a successful registration:
Plain text
Lambda → SNS Topic → Email → Organiser
IAM and CloudWatchIAM controls Lambda permissions using the principle of least privilege. CloudWatch stores Lambda logs for troubleshooting and monitoring.
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📋 What Happens When a Participant Registers?Plain text
Participant
    ↓
Registration Form
    ↓
POST /register
    ↓
API Gateway
    ↓
Lambda
    ↓
Validate Request
    ↓
Generate Registration ID
    ↓
Upload Document → S3
    ↓
Save Registration → DynamoDB
    ↓
Send Notification → SNS
    ↓
Return Registration ID
The frontend sends registration data as JSON, with the uploaded document encoded as Base64.
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🆔 Generating a Registration IDLambda generates a unique ID, such as:
Plain text
REG-2026-A1B2C3
This ID is used to track the registration and organise related documents.
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The completed registration page displays the generated registration ID and confirms that the submission has been successfully processed.
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📂 Document Upload to Amazon S3Lambda decodes the uploaded document and stores it in S3:
Plain text
CSE/
└── REG-2026-A1B2C3_certificate.pdf
The application also validates the file type and handles the uploaded file name.
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🗄️ Storing Registration Data in DynamoDBAfter the document is uploaded, the registration information is stored in the  EventRegistrations  table.
The registration ID is used as the partition key, allowing each registration to be stored as an individual item.
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📧 Sending Organiser NotificationsAfter storing the registration, Lambda publishes a message to SNS.
Plain text
New Registration
       ↓
Lambda
       ↓
SNS
       ↓
Email Notification
       ↓
Organiser
This allows organisers to receive updates without checking the database manually.
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🔐 Validation and SecurityThe application validates:
Required fields
Email format
Phone number
File type
File size
Validation is performed on both the frontend and backend.
The browser never receives AWS credentials. Requests follow this flow:
Plain text
Browser → API Gateway → Lambda → AWS Services
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🔄 Handling Partial FailuresIf an S3 upload succeeds but the DynamoDB operation fails, the uploaded object can be removed to prevent orphaned files.
The notification step is handled separately because an email failure should not necessarily invalidate a successful registration.
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🧪 TestingThe project includes tests for:
Plain text
Valid Registration
Missing Required Field
Invalid Email
Invalid File Type
CORS Preflight
Expected results include:
Plain text
Valid Registration → 200
Invalid Requests   → 400
CORS Preflight     → 200
For successful registrations, I also verify that the document is stored in S3, the registration is saved in DynamoDB, the notification is sent through SNS, and logs are generated in CloudWatch.
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🖥️ Local DevelopmentThe frontend uses:
Plain text
HTML
CSS
JavaScript
It can be developed and tested independently before connecting to the deployed AWS backend.
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🧠 What This Project Taught MeThis project showed me that serverless development is not only about writing a Lambda function. The main challenge is designing how multiple AWS services work together.
I gained experience with:
REST APIs
Lambda
S3
DynamoDB
SNS
IAM
CloudWatch
Validation
Failure handling
End-to-end testing
The complete request lifecycle is:
Participant → API → Compute → Storage → Database → Notification → Monitoring
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💡 Key TakeawaysServerless services reduce infrastructure management.
S3 and DynamoDB provide scalable managed storage.
IAM permissions should follow least privilege.
Multi-service workflows require failure handling.
CloudWatch is essential for troubleshooting.
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🚀 What's Next?Future improvements could include:
Participant authentication
Organiser dashboard
Registration search and filtering
Status tracking
Confirmation emails
QR-code verification
Analytics
Infrastructure as Code
Improved API security and rate limiting
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🎯 ConclusionThe Serverless Event Registration System began as a project to automate a college event workflow. It became a practical way to learn how AWS services can work together in a real-world serverless application.
The final workflow is:
Plain text
Participant
     ↓
API Gateway
     ↓
Lambda
 ┌───┼──────────┐
 ↓   ↓          ↓
S3  DynamoDB    SNS
                ↓
             Organiser
                Email
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     ↓
CloudWatch
The project gave me hands-on experience connecting API processing, serverless compute, document storage, database persistence, notifications, security, and monitoring.
The complete source code is available on GitHub:
 Registration Notification System — GitHub 
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🙌 Final ThoughtsThis project showed me that even a simple registration form can become a useful cloud engineering project when designed around security, validation, failure handling, storage, notifications, and monitoring.

# aws-lambda # amazon-api-gateway # amazon-s3 # amazon-dynamodb # amazon-sns

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Serverless Event Registration & Notification System on AWS🚀

SRI GANTH K

🚀 Introduction

📝 What I Built

🛠️ Technology Stack

🏗️ Architecture

🔗 How the AWS Services Work Together

Amazon API Gateway

AWS Lambda

Amazon S3

Amazon DynamoDB

Amazon SNS

IAM and CloudWatch

📋 What Happens When a Participant Registers?

🆔 Generating a Registration ID

📂 Document Upload to Amazon S3

🗄️ Storing Registration Data in DynamoDB

📧 Sending Organiser Notifications

🔐 Validation and Security

🔄 Handling Partial Failures

🧪 Testing

🖥️ Local Development

🧠 What This Project Taught Me

💡 Key Takeaways

🚀 What's Next?

🎯 Conclusion

🙌 Final Thoughts