Coinbase interview experience Real time questions & tips from candidates to crack your interview
SDE - 1
Coinbase
3 rounds | 5 Coding
problems
Rejected
Interview preparation journey
Journey
My life has had many ups and downs, but I somewhat managed to get admission to the college where I took computer science as a subject. Then my coding journey started from here.
Application story
I applied for this on the company website .
Why selected/rejected for the role?
I was rejected because i am not able to answer all the questions correctly and precise. .
Preparation
Duration: 4 Months
Topics: Data Structures, Pointers, OOPS, System Design, Algorithms, Dynamic Programming
Tip 1 : Practice more problem solving questions
Tip 2 : understand the comcepts in depth
Tip 3 : try to work on onw or two handson project to get more experience in that stack.
Application process
Where: Other
Eligibility: Above 7 CGPA
Tip 1 : Have some projects on resume.
Tip 2 : Do not put false things on resume.
Interview rounds
01
Round
Easy
Video Call
Duration45 Minutes
Interview date20 Jan 2023
Coding problem2
1. Word Wrap
Moderate
20m average time
75% success
0/80
Asked in companies
You are given ‘N’ words of various lengths, now you have to arrange these words in such a way that each line contains at most ‘M’ characters and each word is separated by a space character. The cost of each line is equal to the cube of extra space characters required to complete ‘M’ characters in that particular line. Total cost is equal to the sum of costs of each line.
Your task is to form this arrangement with the minimum cost possible and return the minimum total cost.
Note:
The length of each word should be less than or equal to ‘M’.
You can’t break a word, i.e. the entire word should come in the same line and it must not be the case that a part of it comes in the first line and another part on the next line.
Problem approach
You are given ‘N’ words of various lengths, now you have to arrange these words in such a way that each line contains at most ‘M’ characters and each word is separated by a space character. The cost of each line is equal to the cube of extra space characters required to complete ‘M’ characters in that particular line. Total cost is equal to the sum of costs of each line.
Your task is to form this arrangement with the minimum cost possible and return the minimum total cost.
2. System Design Question
Design something similar to red bus which can handle bookings and can onboard vendors and customers to their platform
Problem approach
Tip 1 : Clear out the requirements first.
Tip 2 : Convey your thoughts regularly and don't overthink the problem.
Tip 3 : Design small and then expand.
02
Round
Medium
Video Call
Duration45 Minutes
Interview date20 Jan 2023
Coding problem2
1. System Design Question
Design synchronous system which can handle producers and consumers. Pretty much the same as a producer-consumer problem. However, the discussion went deep into implementation and the pros and cons.
Problem approach
Tip 1 : Clear out the requirements first.
Tip 2 : Convey your thoughts regularly and don't overthink the problem.
Tip 3 : Design small and then expand.
2. Dice Throws
Hard
35m average time
65% success
0/120
Asked in companies
You are given D dice, each having F faces numbered 1 to F, both inclusive. The task is to find the possible number of ways to roll the dice together such that the sum of face-up numbers equal the given target S.
Note :
As the answer can be large, return your answer modulo 10^9 + 7.
Follow Up :
Can you solve this using not more than O(S) extra space?
Problem approach
You are given D dice, each having F faces numbered 1 to F, both inclusive. The task is to find the possible number of ways to roll the dice together such that the sum of face-up numbers equal the given target S.
03
Round
Easy
HR Round
Duration30 Minutes
Interview date20 Jan 2023
Coding problem1
1. Basic HR Questions
What is your biggest achievement so far?
Where do you see yourself in 5 years?
Why we hire you?
Problem approach
Be honest.
Start by stating the strongest skills and qualities that can be of a great match to the job role.
Be ready with the backup claim for each of the strengths that you mention. Hence, avoid speaking of the strengths that you do not possess.
Do not tell any weakness that can potentially jeopardize your candidature.
Do not mention more than 2 weaknesses and always mention how you are working on improving them.
Do not tell cheesy, cliché answers like “I am a perfectionist which is both my strength and my weakness”.
Here's your problem of the day 
Solving this problem will increase your chance to get selected in this company
Skill covered: Programming
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