11 questions · from 5 interviews
CoinDCX interview questions
Every question candidates reported from their CoinDCX interviews, most frequently asked first. Each links to the write-up it came from, so you can see the round and how it went.
CoinDCX coding and DSA questions
- 01
Find all subsequence strings of a given string
Given an input string, generate all possible subsequence strings (the set of strings that can be derived by deleting zero or more characters without changing the order of the remaining characters). The candidate solved this using a backtracking approach.
- 02
Best Time to Buy and Sell Stock II (Variant)
Variant of LeetCode 122 – Best Time to Buy and Sell Stock II.
Easy · From CoinDCX|| Engineering intern || Interview
- 03
Best Time to Buy and Sell Stock with at most k transactions (Variant)
Variant of LeetCode 188 – Best Time to Buy and Sell Stock with at most k transactions.
Medium · From CoinDCX|| Engineering intern || Interview
- 04
Wiggle Sort II
Given an unsorted array, rearrange it such that nums[0] nums[2] < nums[3] ... (alternating less‑greater pattern).
Medium · From CoinDCX | SSE-1 | Interview Experience
- 05
Minimum Operations to Equalize p and q
Given three integers p, q, and r, you may perform the following operations any number of times: 1) Pick either p or q and increment it by 1. 2) Pick either p or q and divide it by r. The goal is to make p equal to q using the minimum number of operations.…
Medium · From CoinDCX | SSE-1 | Interview Experience
- 06
Can Visit All Rooms
N rooms numbered from 0 to n-1 initially only 0th room is unlocked. Rooms will have keys for any rooms. We need to find if we can visit all the rooms. Input: [[1], [2], [3], []] output : true We start in room 0 and pick up key 1. We then go in room 1 and pick…
Medium · From CoinDCX Interview Questions | SDE-2 | Backend
- 07
Minimum Street Lights to Cover Houses
You are given location of n number of houses on a straight line and k street lights. The street light has a power P value. If a street light is located at location x, it will spread light from [x-P , x+P] You need to find the minimum value of K so that we can…
Medium · From CoinDCX Interview Questions | SDE-2 | Backend
CoinDCX system design questions
- 01
Design a crypto matching engine
Design a matching engine for a cryptocurrency exchange, covering order matching, order book management, latency considerations, and handling of various order types.
- 02
Design Zomato (Food Ordering System)
Design an end‑to‑end food ordering platform similar to Zomato. The task includes high‑level design covering system components, trade‑offs, and scalability, followed by detailed low‑level design of the Order Management System (OMS) focusing on data entities,…
Hard · From CoinDCX | SSE-1 | Interview Experience
- 03
Design Cricbuzz-like System
Design a High-Level Design (HLD) for a system similar to Cricbuzz. This would involve discussing components like real-time score updates, data ingestion, user profiles, notifications, scalability for live events, and overall architecture.
Hard · From CoinDcx | SDE-2 | Bangalore | July 2024
CoinDCX other questions
- 01
Design Splitwise Application
Design and implement a Splitwise-like application. This typically involves handling user expenses, splitting bills, and tracking balances among a group of people.
CoinDCX interview questions FAQ
What questions are asked in CoinDCX interviews?
Candidates reported 11 distinct questions across 5 CoinDCX interviews. 7 coding and DSA questions, 3 system design questions, 1 other questions.
How difficult are CoinDCX interview questions?
Of the questions candidates rated, 13% were easy, 63% medium and 25% hard.