Node.js, Express, Databases, APIs

Summary

Being able to confidently explain and apply your core backend stack's fundamentals under interview pressure — not just use them, but explain why they work the way they do.

How to Learn This

1Practice explaining the event loop, middleware order, and SQL vs NoSQL trade-offs out loud, from memory.
2Do a few live-coding practice sessions building a small API from scratch under time pressure.
3Review your weakest of these areas specifically — most candidates have one.

Social Media Backend (Feed, Comments, Likes)

System design (backend)

More technical in Interview Preparation

System design (backend)Database design & normalization HTTP & REST fundamentals Caching strategies Concurrency & the event loop Security (OWASP Top 10)Debugging distributed systems

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