I believe the first record that I’m aware of it being “a thing” was this blog post, from June, 2017: http://joeduffyblog.com/2017/06/01/an-update-on-me-pulumi/ As far as a proof of concept or MVP of Pulumi, the product and technology has evolved a lot since last summer. It wasn’t until the Fall of last year that the programming model you see today really started to take shape. (Before then there were a lot of differences in how programming languages and the core libraries were handled. Those early versions were pretty rough to use…)