Phonepe Interview Experience | 6 YOE | SDE-III

Role - Backend Engineering (5-7 YOE).

Round 1: It was a Machine Coding round, where there were multiple candidates on call, interviewer came and gave the problem and then asked candidates to solve them on thier own, once done we were supposed to share the code in a zip file to the recruiter. There was a time limit of around 1.5 hour to solve that.

After submission there was a evaluation call where the interviewer came and discussed about the implementation and it was for around 30 mins.
Problem Stamement: : HackAthon Platform

Verdict: Pass

Round 2: It was DSA Round, there were two hard levels problems asked
Problem 1: Sliding Window Maximum I was not able to give the most optimal solution it was roughly O(nlog(n))
Problem 2: Burst Ballon I was able to solve this

Verdict Pass

Round 3: System Design round
Problem: Design a order feed system for a food ordering app where users can see the real time updates to their orders.
Requirements:
1.⁠ ⁠Different category services involved in order path publish realtime context data into feed service under
a global orderId during the order life cycle. Expected Latency: < 50ms
2.⁠ ⁠Client apps can poll feed service for a consumer in real time(<10 ms).
3.⁠ ⁠It should give search/filtering option to user based on orderId, restaurantId, order status, time-window etc.(<150 ms)
4.⁠ ⁠It should allow user to download summary of past orders with a relaxed SLA(<2 sec) with time window constraints for eg. Last 6 months.

Number of users: 500m
Number of daily active users: 100m
Number of orders: 80m
Number Restaurants: 50m
Read qps: 5000
Write qps: 1500


This was not a good round as interviewer made the problem complex even after asking questions was not giving proper answers. Did not went through the process just asked directly to give the design. Overall this round was not good.

Verdict Rejected.