Coinbase interview experience Real time questions & tips from candidates to crack your interview
SDE - 1
Coinbase
3 rounds | 6 Coding
problems
Rejected
Interview preparation journey
Journey
I used to practice on coding platforms daily to stay in touch with the DSA concepts I learned during my college days. I also started learning LLD concepts, knowing I would be interviewed as an experienced candidate.
Application story
I applied for a job opening I found on the Coinbase career page without any referral. After a week, I received a test invitation from the recruiter.
Why selected/rejected for the role?
I was rejected for this role. The interviewers focused not only on the end solution but also on coding style, variable naming, and OOP design for a DSA problem, which I lacked.
Preparation
Duration: 2 months
Topics: Data Structures, Algorithm, OOPs, LLD, Java, Spring Boot
Tip 1: Practice DSA thoroughly.
Tip 2: Be aware of OOP concepts and the basics of LLD.
Application process
Where: Company Website
Eligibility: N/A
Tip 1: Mention tech stacks and relevant projects.
Tip 2: Do not lie
Interview rounds
01
Round
Medium
Online Coding Test
Duration70 minutes
Interview date29 Jan 2024
Coding problem4
There were 4 DSA problems. I think you need to solve at least 3 to clear the cut-off.
1. All Unique Permutations
Easy
15m average time
85% success
0/40
Asked in companies
Given an array number of distinct integers, return all the possible permutations. You can return the answer in any order.
Problem approach
Solved using Backtracing.
2. Valid Sudoku
Moderate
40m average time
60% success
0/80
Asked in companies
Determine if a 9 x 9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules:
Each row must contain the digits 1-9 without repetition.
Each column must contain the digits 1-9 without repetition.
Each of the nine 3 x 3 sub-boxes of the grid must contain the digits 1-9 without repetition.
Problem approach
Solved using Backtracking.
3. Trapping Rain Water
Moderate
15m average time
80% success
0/80
Asked in companies
Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after rain.
Problem approach
Solved using Dynamic Programming.
4. Group Anagrams Together
Moderate
0/80
Asked in companies
Given an array of strings strs, group the anagrams together. You can return the answer in any order.
Problem approach
Solved using Hashmap and sorting.
02
Round
Medium
Assignment
Duration7 days
Interview date29 Jan 2024
Coding problem1
1. Workstyle Assessment
There was a workstyle assessment and some behavioural MCQs. They call it COINsights. This assessment is to give us an understanding of your preferred work style.
Problem approach
Tip 1: Be Honest, do not lie.
Tip 2: This assessment was also considered equally important as the Coding assessment, so do not ignore it.
03
Round
Medium
Video Call
Duration60 minutes
Interview date5 Feb 2024
Coding problem1
Name: Tech Execution Interview
Result: Rejected
Mode: Online
1. System Design
Design a Low-Level Design of Splitwise.
Problem approach
Tip 1: I was given a DSA problem but I was expected to write clean code by applying OOP design.
Tip 2: I did not know LLD/ OOPs design at that time and directly wrote the code without involving OOPs.
Tip 3: Also focus on variable naming and clean code principles.
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