Siemens MERN Stack Mid

MongoDB vs SQL — when do you pick each?

Mongo for flexible documents and fast iteration. SQL when relations and strong transactions matter. ShopNest: product catalog can be Mongo; payments ledger often stays SQL.

Siemens rounds often probe: Industrial software.

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

More Siemens MERN Stack questions

What is the Virtual DOM in React?
Explain useState and useEffect with a real example.
What is middleware in Express?
Explain the Node.js event loop simply.
How do you secure a MERN API?
How do you fix unnecessary React re-renders?

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