> It's very clearly infrastructure. Putting "zero infrastructure" in the title and using the same API as Lambda invoke etc. doesn't make it true. > I also get double the risk of downtime, security as it's a third party running on top of AWS vs. just running on AWS.

You are right. We provide an infrastructure service. We mean by "zero infrastructure" that you don't have to implement and/or manage your own. Our service could run on a platform other than AWS, though, as we are not relying on AWS-only specific services (e.g., lambda, SQS, etc.). Of course, like any other cloud or on-premises service, we could have downtime.

> The API looks nice - but no mention of typescript at all in this post or the website, so presumably type-safety isn't the thing.

Glad to hear this. Although we don't mention it, our client is written in Typescript. If you want to know more, you can check out the code: https://github.com/defer-run/defer.client.