Round 1

Initial 10-15 mins revolved around my current and past experience, which was followed by 2 questions:

1. Monolith vs Microservice
2. Why have you guys used MySQL and not postgres

This was followed by coding questions, the interviewer directly shared the leetcode question link and asked me to share my screen. He checked if I had already solved the question or not from my submissions tab.

Question 1: https://leetcode.com/problems/integer-to-roman/

Question 2: Based on continuous data stream
Given a stream of data coming from an online game portal, every entry looks like this
User_id, timestamp, score
U1, 12:00, 2
U2, 13:00, 3
U1, 13:02, 2
U2, 13:06, 1
U3, 14:03, 4
Need to figure out the sum of scores in the last one hour(Current - 1hr)

Solution - LinkedList

Result = 0
while currTime - currReverseNode.time < 1hr
	Result += currReverseNode.score
	currReverseNode = currReverseNode.prev
Return result

60 min array approach
TC = SC = O(1)

Obj = {
	timeStamp: “”,
	Score: 0
}
DbMinuteWise = [Obj,,.....Obj] // 60 Obj

Const insertData = (userId, timeStamp, score) => {
	If timeStamp == DbMinuteWise[59].timeStamp:
		DbMinuteWise[59].score += score
		return
	DbMinuteWise.pop(0)
	DbMinuteWise.push({ timeStamp, score })
}

Const sumOfScore = () => {
	result = 0
	for obj in DbMinuteWise:
		if obj.timeStamp - currentTime <= 60:
			result += obj.score
	return result
}

Solutions for both the questions were satisfactory.
Got ghosted by recruiter did not receive calls for further rounds.