CoinDCX | SDE 3 | Sept 2026 | Position Closed
- Experience
- 8 years
- Posted
- 5 Oct 2026
Summary
I completed the DSA and LLD rounds for the SDE 3 role at CoinDCX, but the position was closed before the final stages.
How it went
Company: CoinDCX Role: SDE 3
Current Org: Small Startup College: Tier-1 YOE: 8+ Current Comp: 60L Base + 5L Bonus + ESOPs
Round 1 - DSA Two problems:
- A problem related to Wiggle Sort (not exact, but the solution involved counting valleys in a wiggle sort pattern).
- Find all subsequence strings of a given string (solved using backtracking).
Round 2 - LLD Design a crypto matching engine.
Verdict: Position Closed. HR informed me that the upcoming HLD and Manager rounds would be conducted in the office. They even scheduled the rounds, but cancelled them just an hour later because the position got closed and they completely stopped hiring for the role.
Questions asked (2)
- 01
Find all subsequence strings of a given string
Data Structures & Algorithms
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
Design a crypto matching engine
System Design
Design a matching engine for a cryptocurrency exchange, covering order matching, order book management, latency considerations, and handling of various order types.