Request flows through a pipeline. Each middleware can run code before/after the next one, or short-circuit. Order matters: exception handling early, auth before endpoints. ShopNest puts JWT auth before checkout APIs.
Tech Mahindra rounds often probe: Full-stack JS/.NET.
Themes commonly reported in public MNC interview experiences (AmbitionBox / LinkedIn / Glassdoor-style). Practice aloud; keep answers this short in the real round.