Fiserv Full Stack .NET Mid

Singleton vs Scoped — what breaks if DbContext is Singleton?

DbContext is not thread-safe. As Singleton, parallel requests corrupt tracking. Keep it Scoped. ShopNest registers AddDbContext as Scoped for that reason.

Fiserv rounds often probe: Payments domain.

Themes commonly reported in public MNC interview experiences (AmbitionBox / LinkedIn / Glassdoor-style). Practice aloud; keep answers this short in the real round.

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