Salesforce Low Level Design Interview Questions

In Salesforce LLD rounds, sometimes actual requirements may not be clear from problem statement and interviewer will expect you to figure it out by asking clarifying questions.

For example, A message queue is asked indirectly in the form of something like a connection pool or a job scheduler.

It follows the pattern that resources like connections, machines or cpu (in case of job scheduler) are limited and they may not be assigned immediately.

There is discussion about concurrency control when multiple threads are there.

There may also be discussion on concurrency control if our application is made distributed and we are using a central database (i.e. LLD discussion moving to HLD in the end).

Low Level Design of pub-sub queue, kafka and observer pattern is discussed frequently.

Apart from that cache like LRU cache, LFU cache questions are common.
https://leetcode.com/problems/lru-cache/description/
https://leetcode.com/problems/lfu-cache/description/

C++ / OOP questions

What happens if a class dynamically allocates memory but no destructor is defined

Can a constructor be private

Difference between abstraction and encapsulation