Bought Out by Amazon, Now Taking It On

The historic downtown commercial district of Montclair, N.J., is known for its restaurants, antique shops, and art-house movie theater. It’s not usually home to lavishly funded attacks on the entrenched giants of global e-commerce. Yet on the second floor of a three-story red-brick building on Bloomfield Avenue, across a parking lot from a fancy pizza joint and up an unmarked stairwell, are the offices of one of the biggest bets in the history of online retail: a 100-­employee startup called Jet.com.