As an AWS Lambda Developer, your typical day-to-day tasks include designing, coding, and deploying serverless functions, integrating with AWS services like DynamoDB, S3, and API Gateway, and troubleshooting production issues. You'll collaborate frequently with DevOps engineers, front-end developers, and project managers to deliver end-to-end cloud solutions. Maintaining best practices for security, scalability, and code quality is a crucial part of the role. Regularly reviewing logs, optimizing performance, and documenting processes are also important to ensure your applications run efficiently in production.