NORMAL, Ill. — By definition, the time of the world’s richest man is pretty valuable. But early last fall, Jeff Bezos sought out a 36-year old entrepreneur named R.J. Scaringe and spent the better part of a day in Plymouth, Mich., at the company he founded, Rivian.

Mr. Bezos got a preview of Rivian’s electric pickup truck and sport utility vehicle and liked what he saw. Not long after his visit, Amazon led a $700 million investment in Rivian. Two months later, in April, Ford Motor invested $500 million. All told, Rivian has raised $1.7 billion without selling a single truck or S.U.V.

If you have not heard of Rivian before, well, that was intentional. Until recently, it was in stealth mode, operating out of unmarked buildings and making few public announcements. But no longer. By the end of 2020, Rivian intends to begin producing premium electric vehicles, with a greater range than anything on the road today.

Rivian is promising to do for trucks what Tesla did for luxury cars.

That’s where the similarities between the two electric automobile makers end. Even as Tesla and its brash chief executive, Elon Musk, made headlines by setting and falling short of some audacious goals, Mr. Scaringe and Rivian have spent a decade fine-tuning their designs.