Sharing my interview experience at CoinDCX for the SSE-1 (SDE-2) position.

YOE: 4 years

Round 1 - Pre-Screening (DSA + LLD)

Taken by Intervue
Duration: 1 hour
Difficulty: Medium

DSA 1
Wiggle Sort II

DSA 2
Given p, q, and r, with two operations allowed:
Pick either p or q and increment it by 1.
Pick either p or q and divide it by r.
The operations can be performed any number of times until p == q.
Find the minimum number of operations required.

LLD
Designed the classes, data entities, and lifecycle for a Food Ordering System.

Round 2 - System Design (LLD + HLD)

Duration: 1 hour 30 minutes
Difficulty: Hard

I was asked to design Zomato. The problem was quite open-ended, and I was given the freedom to cover different aspects of the system.
The interviewer went deep into multiple design components and their trade-offs. This made the round quite challenging but also very interesting and productive.
After the HLD discussion, I was asked to design the LLD for the main service — Order Management System (OMS). The focus was mainly on data entities, class design and responsibilities and interactions between classes.
I was also asked to design Food Rescue feature of Zomato.

Round 3 — Fitment Round with EM

Duration: 45 minutes

The round started with introductions, followed by questions about my background and projects. This was followed by behavioral and motivation-based questions, including:

• How do you handle conflicts with a co-worker?
• Why do you want to change your company?
• Why do you want to join CoinDCX?
• What are you expecting from the organization?
• What are some things you learned in your previous organization that you would like to continue in your next organization?
• What are some things you would like to discontinue?

Hope this helps others preparing for interviews. Good luck!