Any intervention in a bank’s core system makes an engineering team wince. Legacy solutions are rigid, so a single change can take a month to move through. Lending, which is one of a bank’s major sources of income, feels this most. Anyone who has shipped a release on a bank core knows the pattern: a new product needs a new approval tier, a revised document checklist, an adjusted scoring rule, and an updated reporting feed, each touching code that has run for decades. As a result, new products…