What a big tech backend loop actually tests

This is a sample write-up so you can see how publishing works — replace it with your first real interview experience. The format below is what I’d suggest for every write-up: rounds in order, what was asked, and what was actually being scored.

The shape of a loop

A typical backend loop at a large company runs four to six rounds: one or two coding rounds, a system design round, a low-level design round, and a behavioral/bar-raiser round. Each one has a public question and a private rubric.

Coding rounds

The question is rarely the point. What gets scored:

• Did you clarify constraints before typing?
• Did you state a brute force and then improve it, narrating the trade-off?
• Did you test your own code without being told to?

System design

Structure beats knowledge. An average answer that follows a clean framework outscores an encyclopedic answer that wanders. Interviewers are writing feedback in real time — give them headers to write under.

What I’d tell my past self

Treat every round as a communication exercise that happens to involve code. The engineers who pass aren’t the ones who know the most — they’re the ones who make their thinking easiest to follow.