Coinbase interview experience Real time questions & tips from candidates to crack your interview
SDE - 1
Coinbase
2 rounds | 4 Coding
problems
Rejected
Interview preparation journey
Journey
I was admitted to DTU in the computer science stream. My seniors advised me to practice DSA from the start of my B.Tech, but I did not take their advice seriously. I regretted not following their advice, and in my third year, I started coding and had to increase my practice hours because I started late.
Application story
I applied for the position through the campus drive. After applying, I practised hard for it, and the hard work finally paid off.
Why selected/rejected for the role?
I think I was on point with my coding solutions to the questions asked in the interviews. I could not provide the optimal solutions and was giving correct explanations to some theory questions asked.
Preparation
Duration: 6 months
Topics: Data Structures, Pointers, OOPS, System Design, Algorithms, Dynamic Programming
Tip 1: Even if you are stuck on a problem, give it a try. The interviewer will help you.
Tip 2: Prepare Data Structures and Algorithms well. They mainly check your problem-solving ability to find solutions for real-world problems.
Tip 3: Be confident and don't be nervous. Maintain at least two projects on your resume.
Application process
Where: Campus
Eligibility: Above 7 CGPA
Tip 1: Mention at least two projects.
Tip 2: Highlight the skills in which you excel.
Tip 3: Ensure your resume is not too long or too short.
Interview rounds
01
Round
Easy
Video Call
Duration60 minutes
Interview date8 Dec 2022
Coding problem2
1. Sudoku Solver
Hard
25m average time
75% success
0/120
Asked in companies
You have been given a 9x9 2d integer matrix 'MAT' representing a Sudoku puzzle. The empty cell...
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2. Cycle Detection in a Singly Linked List
Moderate
15m average time
80% success
0/80
Asked in companies
You are given a Singly Linked List of integers. Return true if it has a cycle, else return false.
A cycle occurs when a node's next points back to a previous node in the list.
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02
Round
Medium
Video Call
Duration60 minutes
Interview date8 Dec 2022
Coding problem2
1. Occurrence Of Each Word
Easy
10m average time
90% success
0/40
Asked in companies
You are given a string S of words. Your task is to count the occurrence of each word present in the string S. A ...
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Problem approach
Linear search solution was not working there as they are expecting less than O(n) complexity, so I solved this using binary search by finding the first and the last occurrence of element and subtracting them which will give the required answer.
2. Maximum of All Subarrays of Size K
Easy
15m average time
85% success
0/40
Asked in companies
You are given an array “A” of N integers. Your task is to find the maximum element in all K sized contiguous subarrays from left to right.
For Example:
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Here's your problem of the day 
Solving this problem will increase your chance to get selected in this company
What is the result of 4 % 2?
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