Challenging an e-commerce behemoth like Amazon requires an immense amount of connections and resources, not to mention experience and strategy. Jet.com has plenty of the latter two, having been founded by the same man who founded Diapers.com, and with $350 million in new funding and another $150 million on the way, the promising e-commerce startup now has some of the former as well. The company still has a long way to go before it can be considered a legitimate threat to Amazon, but it intends to use this funding to help it get there.