For Xeris, #Serverless' main advantage is the reduced cost. However it also
simplified the provisioning of multiple instances of their solution, for
testing, preview and development. Some not so serverless services need special
attention.

For a lambda in a VPN AWS Private Link allows to access S3 for free, and other
resources cheaper than NAT Gateway: https://aws.amazon.com/privatelink/

Overall experience and learnings • Having a "unlimited" environments is #awsome
• Running completely* serverless has a cost • Increase in complexity caused by
limitations • Easy to get going • Hard to keep the principles as system grows