Airtel interview experience Real time questions & tips from candidates to crack your interview
Software Engineer
Airtel
3 rounds | 4 Coding
problems
Selected Interview preparation journey
Preparation
Duration: 3 Months
Topics: Data Structures, OOPS ,Core Java(Memory Management, Java 8 features), System Design, Focus more on DFS And BFS
Tip 1 : Start Early And Practice Daily
Tip 2 : Take part in contest whether it is lc or codeforces
Tip 3 : Start with easy questions to gain confidence and them jump to medium and hard
Application process
Where: Referral
Eligibility: 7 CGPA
Tip 1 : Highlight the key features which improved the product like reducing the build time of the product, reducing the service time or making service fault tolerant.
Tip 2 : Highlight your achievements in a separate achievements section if any.
Interview rounds
01
Round
Medium
Video Call
Duration60 Minutes
Interview date20 Mar 2021
Coding problem2
The round started sharp at 10 am. All 3 rounds happened on same day. This round focus on major data structures and algorithms.
1. Number of Islands
Easy
0/40
Asked in companies
You have been given a non-empty grid consisting of only 0s and 1s. You have to find the number of islands in the given grid.
An island is a group of 1s (representing land) connected horizontally, vertically or diagonally. You can assume that all four edges of the grid are surrounded by 0s (representing water).
Problem approach
I had already solved this problem, so had idea about the dfs solution. Challenges was the timing , so there were some minor error but I was able to solve question in 20minutes.
2. Level Order Traversal
Easy
15m average time
85% success
0/40
Asked in companies
You have been given a Binary Tree of integers. You are supposed to return the level order traversal of the given tree.
For example:
For the given binary tree
The level order traversal will be {1,2,3,4,5,6,7}.
Problem approach
This was a challenging problem since it was required to print element levelwise. I was confused on breaking condition for level. I thought of storing the each level elements in a map using level as a key but it was using map as extra space. So instead of that, I calculated the queue size every time we change the level thus only iterating the element from a level.
02
Round
Easy
Video Call
Duration60 Minutes
Interview date20 Mar 2021
Coding problem1
This round was mix of data structures, oops and core java questions. As I was having experience in java , so main focus was on checking core java knowledge. There were questions around garbage collections, difference between runnable vs callable etc.
1. 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.
Example:
In the given linked list, there is a cycle, hence we return true.
Problem approach
I solved using slow and fast pointer approach.
03
Round
Medium
Video Call
Duration60 Minutes
Interview date20 Mar 2021
Coding problem1
This round composed of ds, databases and system design. The round started with building db queries with two tables. These queries were easy. The main question was to design ola.
1. System Design Question
Designing the Ola. How to assign the nearest the driver to the customer.
Problem approach
Tip 1 : Start with a basis solution adding the core functionalities.
Tip 2 : Ask for the requirements. Don't assume anything or confirm with interviewer on assumption while designing
Here's your problem of the day 
Solving this problem will increase your chance to get selected in this company
Skill covered: Programming
How do you remove whitespace from the start of a string?
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