Adebayo Omolumo
Software Engineer
Cloud | DevOps | Web(3)
  • Location:
  • Type:
  • Period:
    November - December 2022
  • AWS Lambda
  • Serverless framework
  • Authentication mechanisms
  • Best practices
  • Code structure
  • Secure access
  • Separation of concerns
  • Data handling
  • HTTP requests
  • Serverless development
  • Access controls
  • Metrics generation
  • Distributed tracing
  • Monitoring
  • Composite key
  • Scan operation
  • Performance optimization


DevOps, AWS Lambda

Project details

Project Description:

The project focused on developing and deploying a serverless "TODO" application using AWS Lambda and the Serverless framework. This application allowed users to manage their TODO items by creating, updating, deleting, and retrieving them from a DynamoDB database. Several key features, including file uploads, authentication, and adhering to best practices for code organization and performance, were implemented to ensure a robust and secure user experience.

Problem Statement:

The challenge was to create a serverless TODO application with various functionalities while adhering to best practices, optimizing code organization, ensuring secure authentication, and providing an efficient data storage mechanism.

My Contributions:

  • Functionality Implementation:
    The application was designed to include core functionalities such as creating, updating, deleting, and fetching TODO items. Users could also upload attachments, and pre-signed URLs were generated for file uploads.
  • DynamoDB
    I created a DynamoDB table to store TODO items efficiently using a composite key. The application interacted with this table to perform data operations.
  • Authentication Setup:
    Authentication was implemented to allow only logged-in users to access the application. IAM role statements were provided for necessary actions on DynamoDB, ensuring secure access. HTTP requests were validated within Lambda handlers to enhance security.
  • Code Organization:
    The codebase was structured into multiple layers, including businessLogic, dataLayer, and fileStorage, adhering to the separation of concerns principle. Code was implemented using async/await and Promises for enhanced readability and maintainability.
  • Best Practices Adherence:
    The project followed best practices for AWS Lambda and Serverless development:
    • Resources were defined in the "serverless.yml" file.
    • Each Lambda function had its own set of permissions for precise access control.
    • HTTP requests were validated for security.
    • Application-level metrics were generated for monitoring.
    • AWS X-Ray was enabled for distributed tracing.
    • Monitoring was in place to ensure application health and performance.

Outcome of the Project:

The "Serverless TODO Application Deployment on AWS Lambda" project resulted in several significant outcomes:
  • Robust Functionality:
    The application successfully delivered core TODO management features while ensuring data integrity and security.
  • Efficient Data Storage:
    DynamoDB was used to efficiently store and retrieve TODO items, optimizing performance.
  • Secure Authentication:
    Authentication measures ensured that only authorized users could access the application.
  • Code Quality:
    The codebase's organization and use of async/await and Promises demonstrated high code quality and maintainability.
  • Best Practices Adherence:
    The project showcased a strong commitment to best practices, ensuring optimal resource management, access control, security, monitoring, and performance.

Key Takeaways

In conclusion, the "Serverless TODO Application Deployment on AWS Lambda" project demonstrated my proficiency in developing serverless applications that adhere to industry best practices. The application's robust functionality, efficient data handling, and secure authentication underscored my ability to create practical and high-quality serverless solutions on AWS Lambda.


In this project, I focused on developing and deploying a serverless "TODO" application using AWS Lambda, the Serverless framework, TypeScript for code development, and integrating with Auth0 for secure authentication. This application enabled users to efficiently manage their TODO items, including creating, updating, deleting, and retrieving tasks from a DynamoDB database. I also implemented features like file uploads, robust authentication with Auth0, and adhered to best practices to ensure code organization and performance. Postman was utilized for API testing, and the API Gateway Management API was integrated to facilitate real-time updates and interactions with clients. Notably, this project showcased the utilization of a comprehensive tech stack, including AWS Lambda, Serverless framework, TypeScript, DynamoDB, Auth0 for authentication, Postman for testing, and the API Gateway Management API, resulting in a high-quality serverless TODO application on AWS Lambda with a focus on security and real-time communication.


AWS Lambda
AWS Lambda is a serverless computing service that allows you to run code without provisioning or managing servers. In this project, AWS Lambda was the core compute service used to execute functions for the TODO application.
Serverless Framework
The Serverless framework is an open-source framework that simplifies the deployment and management of serverless applications. It was employed to define and deploy AWS Lambda functions and related resources.
TypeScript was chosen for code development to ensure robustness and type safety in the project. It enhanced code quality and provided a level of predictability during development.
DynamoDB is a managed NoSQL database service provided by AWS. It served as the data storage solution for storing and retrieving TODO items efficiently.
Auth0 was implemented for secure user authentication, ensuring that only authorized users could access the application. It provided robust authentication mechanisms, enhancing the overall security of the TODO application.
Postman played a crucial role in the project by facilitating API testing and validation. It enabled developers to test APIs, ensuring that they functioned as expected and met the project requirements.
API Gateway Management API
The integration of the API Gateway Management API enabled real-time client interactions and updates. It played a pivotal role in ensuring that the application provided a responsive and dynamic user experience.
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Adebayo Omolumo