Mostly Resume Discussion, DBMS question such as sharding, normalization were asked, it started with my internship experience, they asked me everything i did, i had wrote i have designed Database structure, so they asked me that, they gave me SQL table, they said normalize it in the highest form achievable, tell several forms with advantages and disadvantages of higher normalization, then it shifted to security level, how will one prevent from ddos attack, if there's otp system, how will one prevent ddos attack from happening, as otp usually is 6 digit and it is easy for computer to parse that in minutes, then they went with several OS question as threading, process difference, what happens when ram is full, what is disadvantage of process switching, more memory, different scheduling process, thrashing, and so, after this they gave koko eating banana and ended the interview.

They asked HLD, mostly, gave a system to build, actaully my intern project system only, where i have build candidate onboading platform, they said design that system, then again asked several edge cases, what if soemone attacks, what if db fails, what if payment happens but user doesn't get notified, and so, we went from basics to carefully placing load balancer, rate limiter, db, redis, multi microservice architecture for student onboarding, and then they kept asking every use of system why redis, why rate limiter, which algo of rate limiter, what is disadvantage of window rate limiter, what is gateway api and full grill on this, the asked which request api will go, what metadata will it contain, what data, how will it be handled, how will one prevent sql injection, and so, then they jumped to oops question with what is RAII, what is 3 of rule, what if 5 of rule and so