Marqeta is a startup that wants to change the way people pay. It needs a site that can accommodate prospects, customers, merchants, prospective merchants and investors. The product story is complicated — basically, you pre-pay to gain discounts. The product process is complicated — a cardholder has to decide how much she wants to deposit in her card account this week or month for which merchants. And because the target is youngish moms, it helps to present it all with a little style.