Pedro here, co-founder of Brex (YC W’17, https://brex.com/) writing about a major product update. In June 2018 we first shared with the HN community the launch of our corporate card for startups. Here’s our first post: https://news.ycombinator.com/item?id=17418813
Just as we built our underwriting and issuing platform from scratch, we built our rewards platform internally, rather than use third-party software that typically comes as a module within existing bank industry softwares.
I have outlined the technical details of what we built in this blogpost. Would love to hear some feedback from the HN community :)