The Go programming language is a great fit for building serverless applications. Go applications can be easily compiled to a single, statically linked binary, making deployment simple and reducing external dependencies. They start up quickly, which is ideal for serverless environments where functions are frequently invoked from a cold start. Go applications also tend to use less memory compared to other languages, helping optimize resource usage and reduce costs in serverless scenarios.

Azure Functions supports Go using custom handlers, and you can use triggers and input and output bindings via extension bundles. Azure Functions is tightly integrated with Azure Cosmos DB using bindings (input, output) and triggers.