We have explored programming Lambda using Java, Python, and C#. In the case of Java, we used Eclipse with the AWS Toolkit plugin to create simple Lambda functions, as well as more complex serverless projects that include multiple Lambda functions, the API Gateway service, and DynamoDB. Similarly, in the case of C#, we used Visual Studio with the AWS Toolkit to create simple Lambda functions, as well as a more complex serverless project. For Python, we used the serverless framework.