Small startup with brand new team, no devops/infrastructure/security. Most engineers are mid-level and not really strong on infrastructure, they are hired to build features and backend.

In this environment something like Porter Cloud would make it far simpler to deploy apps as they were being built and know that there is a chance of scale (at least to a certain degree). Otherwise you get to watch engineering grind to a halt while everyone learns how ECS/AIM/SSM/XYZ works.

Spend some time understanding what Cloud Functions has to offer. There really isn't much to it at all. A http handler function is all you need. No infrastructure or need to do much deeper than that.