Receiver Eric Saubert made the game-winning two-point conversion for the Seahawks.
Seattle staged a stunning comeback to overcome the Los Angeles Rams in overtime, clinching their spot in the postseason.
Overcoming a sixteen-point deficit in the final period, the Seattle squad triumphed 38-37 at home, notching their fifth consecutive win.
While the Los Angeles had already secured a post-season spot earlier on Sunday, the Seattle team secured their place to the play-offs after a 24-month hiatus.
With this outcome, the Seahawks now lead their division's race with a 12-3 mark, supplanting the Los Angeles, who fell to the number five playoff position with an eleven and four standing.
Signal-caller Darnold threw two picks but recovered to make two touchdown passes, including the second TD to star receiver Jaxon Smith-Njigba in overtime.
The visitors held a six-point lead at the break before Kenneth Walker III burst through for a 55-yard scoring dash for the home side.
Los Angeles cornerback Wallace then took back Darnold's initial interception for 56 yards, setting up a one-yard score by Blake Corum on the ensuing snap.
In the final stanza, a touchdown from Stafford to Puka Nacua pushed the advantage to 30-14, but Shaheed provided the hope with a 58-yard punt return.
Darnold then connected with Barner in the endzone, and a successful two-point play sent the game into overtime.
Although Nacua scored for his another TD in overtime, Jaxon Smith-Njigba responded in kind to setup the game-winning conversion.
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