I recently went through this, though with the (arbitrary) goal of running for free indefinitely. This is tougher, since you can't use API Gateway and need to th

I recently went through this, though with the (arbitrary) goal of running for free indefinitely. This is tougher, since you can't use API Gateway and need to throttle your dynamo operations. SQS ended up being the key to making this work: everything is asynchronous, and the js SDK is used to enqueue messages directly from the frontend. That setup is described in https://www.simonmweber.com/2018/07/09/running-kleroteria-for-free-by-abusing-free-tiers.html https://www.simonmweber.com/2018/07/09/running-kleroteria-fo..., if you're interested.