Tight end Saubert executed the game-winning two-point conversion for the Seahawks.
Seattle engineered a remarkable comeback to defeat the Los Angeles Rams in overtime, clinching their place in the NFL play-offs.
Overcoming a 30-14 hole in the final period, the Seahawks triumphed by a single point at home, notching their fifth consecutive win.
While the Rams had already secured a post-season spot earlier on game day, the Seattle team secured their place to the play-offs after a 24-month hiatus.
With this result, the Seahawks have taken over their Conference race with a twelve and three record, supplanting the Rams, who fell to the fifth seed with an eleven and four record.
Signal-caller Darnold had two interceptions but regrouped to make two scoring throws, culminating in the second TD to wideout Smith-Njigba in the extra period.
The visitors held a six-point advantage at the break before Kenneth Walker III broke free for a 55-yard scoring dash for the home side.
Los Angeles cornerback Wallace then returned Darnold's first pick for 56 yards, leading to a short touchdown by Blake Corum on the ensuing snap.
In the fourth quarter, a scoring pass from Stafford to Puka Nacua extended the Rams' lead to 30-14, but Shaheed provided the hope with a 58-yard return for a score.
Darnold then found AJ Barner in the end zone, and a successful conversion sent the game into overtime.
Although Puka Nacua raced in for his another TD in OT, Smith-Njigba responded in kind to set up the decisive score.
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