Got the referral through 3rd party recruitment firm

Round 1 -
Question was tough, but interviewer was helpful, gave a lot of hints

Given a sample equation -> ? + ? + ? - ? = 6
All the question marks can be replaced by any natural number starting from 1 to (k-1) , k is RHS value
So every question mark will be strictly less than RHS value

The one above is a sample equation the count of question marks can range from 1 to 100
and between two question marks there can be a (+) sign or a (-) sign

The value in RHS can range from 1 to 10,000

Find a way to compute the values of question marks so that you can return at least 1 set of numbers that satisfies the equation.

If no such set is possible, return empty set.

Round 2 -
Code to convert Sorted linkedList to balanced BST + Project discussion

Did pseudocode properly, could not run the code as got stuck in between and then
when completed the time was offer

Round 3 -
Twitter system design.
Interviewer was interactive. Covered almost all requirements decently

Round 4 -
HM round, mostly technical round centred around projects and some aws implementation questions and bit of behavorial.
Went decent

Round 5 -
Discussion with Director of engineering, mostly around work and company.
Round looked like a formality

Overall experience of interview was great, interviewers were helpful and knowledgable.

They took few weeks to roll out the offer after the selection email which looked like a long time considering it is a Series A startup.
The offer was good but I went to ahead with another offer for personal reasons.

I found their work interesting and strong team, but due to some personal career goals went ahead with another company.