Pedro here, co-founder of Brex (YC W’17, <a href="https://brex.com/" rel="nofollow">https://brex.com/</a>) 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: <a href="https://news.ycombinator.com/item?id=17418813" rel="nofollow">https://news.ycombinator.com/item?id=17418813</a><p>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.<p>I have outlined the technical details of what we built in this blogpost. Would love to hear some feedback from the HN community :)