Alexa skills can be developed using either Alexa Lambda functions or a REST API endpoint. Lambda function is Amazon's implementation of serverless functions available in AWS. Amazon recommends using Lambda functions; however, they are not easy to debug. While you can log to a CloudWatch log, you can't hit a breakpoint and step into the code. Debugging services, like RookOut for Node and Python, allow for live debugging, but there is no equivalent for C#.