Receiver Saubert made the game-winning two-point conversion for the Seahawks.
Seattle engineered a stunning fightback to overcome the Los Angeles Rams in extra time, securing their place in the postseason.
Rallying from a 30-14 hole in the final period, the Seahawks emerged victorious 38-37 at home, registering their fifth straight victory.
While the Los Angeles had already secured a playoff berth earlier on game day, the Seahawks booked their return to the play-offs after a 24-month hiatus.
With this result, the Seattle now lead their Conference standings with a twelve and three record, replacing the Rams, who fell to the fifth playoff position with an 11-4 standing.
Quarterback Darnold had two interceptions but recovered to deliver two touchdown passes, including the second TD to wideout Jaxon Smith-Njigba in overtime.
The Rams held a 13-7 lead at half-time before Kenneth Walker III burst through for a 55-yard touchdown run for Seattle.
Los Angeles defensive back Josh Wallace then returned Darnold's initial pick for a big return, leading to a one-yard score by Blake Corum on the ensuing snap.
In the final stanza, a scoring pass from Matthew Stafford to Puka Nacua extended the advantage to 30-14, but Shaheed provided the comeback with a spectacular return for a score.
Darnold then connected with AJ Barner in the end zone, and a converted conversion sent the contest into overtime.
Although Nacua raced in for his another TD in OT, Jaxon Smith-Njigba responded in kind to setup the decisive score.
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