Receiver Saubert made the decisive two-point play for the Seahawks.
Seattle staged a stunning fightback to overcome the Los Angeles Rams in extra time, clinching their place in the NFL play-offs.
Overcoming a 30-14 hole in the fourth quarter, the Seattle squad triumphed 38-37 at home, registering their fifth straight victory.
While the Rams had become the first to earn a post-season berth earlier on Sunday, the Seahawks booked their return to the play-offs after a two-year hiatus.
With this outcome, the Seahawks have taken over their division's race with a 12-3 record, replacing the Los Angeles, who fell to the number five seed with an 11-4 standing.
Signal-caller Darnold had two picks but regrouped to make two touchdown passes, including the second score to star receiver Jaxon Smith-Njigba in overtime.
The Rams held a six-point lead at the break before Walker broke free for a long scoring dash for the home side.
Rams defensive back Josh Wallace then returned Darnold's initial interception for a big return, setting up a one-yard touchdown by Blake Corum on the next play.
In the fourth quarter, a scoring pass from Stafford to Nacua pushed the Rams' lead to sixteen points, but Shaheed ignited the comeback with a spectacular return for a score.
Darnold then found Barner in the endzone, and a successful conversion forced the contest into an extra period.
Although Puka Nacua raced in for his another TD in overtime, Smith-Njigba answered in kind to set up the game-winning conversion.
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Brian Hernandez
Brian Hernandez