Depending on the startup time, you can use something like AWS Serverless Express and just wrap the application. If startup takes a little while you can store an

Depending on the startup time, you can use something like AWS Serverless Express and just wrap the application. If startup takes a little while you can store an instance above the handler code which will be kept alive across invocations of that serverless instance. I've used this to great success in a similar project.