Unacademy interview experience Real time questions & tips from candidates to crack your interview
SDE - 1
Unacademy
4 rounds | 5 Coding
problems
Selected Interview preparation journey
Preparation
Duration: 1 month
Topics: System Design, Algorithm, Data structures, Binary Trees, Hash map, Graphs, Heaps, SQL
Tip 1 : Time yourself while solving: 10min for easy, 20 for medium and 35 for Hards
Tip 2 : Review solved questions to get accustomed to patterns
Tip 3 : Never ever memorise solutions
Application process
Where: Linkedin
Eligibility: Have good work experience with relevant language experience
Tip 1 : Mention achievement metrics for projects you worked on
Tip 2 : limit to single page and don’t have graphs
Interview rounds
01
Round
Easy
Telephonic
Duration30 minutes
Interview date2 Aug 2021
Coding problem2
Good environment, asked 2 DS questions of easy difficulty. Solved within time limit
1. Merge Two Sorted Linked List
Moderate
15m average time
80% success
0/80
Asked in companies
You are given two sorted linked lists. You have to merge them to produce a combined sorted linked list. You need to return the head of the final linked list.
Note:
The given linked lists may or may not be null.
For example:
If the first list is: 1 -> 4 -> 5 -> NULL and the second list is: 2 -> 3 -> 5 -> NULL
The final list would be: 1 -> 2 -> 3 -> 4 -> 5 -> 5 -> NULL
Problem approach
1. Have 2 pointers, one for each list.
2. Compare values and update to new list accordingly.
2. Symmetric Tree
Moderate
25m average time
70% success
0/80
Asked in companies
You have been given a Binary Tree having 'n' nodes.
A Symmetric tree is a binary tree whose mirror image is the same as the original tree.
Find out whether the given tree is symmetric or not.
Example :
Input: Let the binary tree be:
Output: YES
Explanation: As we can see in the image, the original tree is the same as the mirrored tree.
Problem approach
Traverse tree recursively and compare nodes, return early if values are mismatch
02
Round
Medium
Video Call
Duration60 minutes
Interview date8 Apr 2022
Coding problem1
Afternoon interview.
Interview was open ended thus needed to clarify a lot to get proper requirements
1. System Design Question
Design a database for a subscription system with tiers for Unacademy.
Problem approach
Tip 1 : Ask questions to get clear requirements
Tip 2 : never assume, always ask or be clear you are making the assumption I.e Assume that all users are from India
Tip 3 : Be sure to use indices, know if SQL or NoSQL is applicable
03
Round
Medium
Video Call
Duration60 minutes
Interview date11 Apr 2022
Coding problem1
Afternoon time
Interview was good
Nice environment
1. System Design Question
Design a real-time ranking for a live exam.
Problem approach
Tip 1 : Clear up requirements with many questions
Tip 2 : come up with a basic solution and then build on it
Tip 3 : practicing and read many articles for system design
04
Round
Easy
HR Round
Duration30 minutes
Interview date12 Apr 2022
Coding problem1
Afternoon to evening
Interview was easy
1. Technical Questions
Project Discussion.
Asked about my salary expectations.
Am I ready to relocate?
Problem approach
Tip 1 : Be confident
Tip 2 : Understand ESOP/RSUs and negotiate then as these can’t be changed for 4 years
Tip 3 : Research salary ranges and maintain above median
Here's your problem of the day 
Solving this problem will increase your chance to get selected in this company
Skill covered: Programming
What is recursion?
Choose another skill to practice
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