Carwale SDE (Software Development Engineer) Interview Questions, Process, and Tips

Round: Test
Experience: There were 4 questions of varying difficulty. Those attempted atleast 2 were selected for the next round.
Q1) Question based on Tower of hanoi problem. I solved it using dynamic programming.
Q2) Check for balanced parenthesis in an expression.
Q3)One adhoc question to calculate the maximum number of people present at a particular time in a hotel.
Q4) One other question based on string algorithms.
two adhoc questions
Tips: Lead in this round can benefit you in next rounds, so give your best shot
Total Questions: 4

Round: Technical Interview
Experience: The interviewer asked to write the full code for a couple of questions only
Tips: Prepare DS nicely.
Strong OOPs concepts.
They want optimized solution of all.
Be honest with your interviewer.
Don't pretend.

Round: Other Interview
Experience: Ask me write and compile the codes.
The interviewer was very friendly and helping nature.
He was giving hints where i stuck.
He was checking my thinking and prolem solving capability.
Tips: Correct explaination matters,time doesn't.Take your time.
Ask fro hint.
Be yourself.Don't pretend.
All the best :)

Skill Tips: Have conceptual knowledge of subjects, don't just mug up things. Interviewers are smart enough to make it out anyway.
Skills: C++, Object Oriented Programming, Algorithms And Data Structures, Ability To Think
College Name: NIT Allahabad
Motivation: Flat hierarchy.
Good progress by the company in its last 10 years of expansion.
opportunity to work with best minds of the country.
Decent salary.

Round: Test
Experience: Coding Platform : Hackerrank(C/C++/Java)
1) Check for balanced parenthesis in an expression.
2) Count all possible paths from top left to bottom right of a MxN matrix. (from each cell you can move only to right or down)
3) Given an array of size n and its elements, you have to include k elements such that the difference between the highest and lowest number in these k elements is minimum.
4) Find number of pair in a given array which is equal to given sum.
Duration: 120 minutes
Total Questions: 4

Round: Technical Interview
Experience: At the start of interview I was asked to Rate myself(out of 10) in Aptitude, Puzzle and then for C++.
For both I rated myself closer to 8.




Round: TECHNICAL AND HR
Experience: Icebreaker question- Tell me about yourself.
1. A question on tree Data structure.
2. I was asked about my Project work in college which was on Operating System. Detailed explanation why and how I picked this project. Who were the group members, how was the group formed, how much was the involvement of college faculty? What is its use in future? What was my role in the project?
The interviewer pointed out some flaw in algorithms used in project. Basically he asked me to think of Data Structures through which insertion can be done in O(1) as well as deletion and retrieval in O(1)…like the implementation of LRU cache algorithm.
The process took 40 minutes.
3. Discussion on second project which was on knn algorithm.
4. Asked me about tiny Url or Url shortener. Implement it.
Tips: The interviews were really thought provoking and the interviewers were helpful and friendly. It felt like solving problems as a team and not at all like a test. The interviewers were quite receptive to our questions and patient.

Skills: Object Oriented Programming (OOP) Basics, Puzzle Solving Capability, Operating System Basics, Algorithm, Data Structures
College Name: NIT Bhopal

Round: Test
Experience: Online coding session :
Q1). Check for balanced parenthesis in an expression.
Q2). Count all possible paths from top left to bottom right of a M x N matrix.
(From each cell you can move only to right or down).
Q3) Count number of pairs with given sum in an array.
Q4). Print (N-K) values corresponding to min of each K-sized chunk in a given array of size N.

Tips: Lead in this round can benefit you in next rounds, so give your best shot.
Duration: 120 minutes minutes
Total Questions: 4

Round: Technical Interview
Experience: This was about a 30 min session.
He asked me very easy concept based questions.

Q1). Explain your project briefly.
Q2). Explain multiple inheritance
Q3). Why JAVA doesn’t support multiple inheritance.
Q4). Convert a hexadecimal to binary number and vice versa.
Q5). What are balanced BSTs?
Q6). Explain all possible rotations possible in a balanced BST.
Q7). Write INSERT function for a balanced BST.

Tips: Correct explaination matters,time doesn't.Take your time.

Round: Technical Interview
Experience: This was Technical + HR round :

Q1). Detailed discussion on my intern project.
Asked the shortcomings of the project and approaches to resolve them.
Q2). Discussion on minor project (Threaded download accelerator)
Asked about what all different approaches I could have followed in the project and why didn’t I chose them.
Q3). Favorite subject – I replied OS.
Asked few basic questions-
What are threads? How are they different from process? Explain with example.
I don’t remember the other os questions he asked about.
Q4). Implement Twitter.
It wasn’t easy to make him understand the approach. He was kind of satisfied with my approach at the end.
Q5). Discussion on other projects.
.
HR questions followed.

Tips: Be yourself.Don't pretend.
All the best :)

Skill Tips: Have conceptual knowledge of subjects, don't just mug up things.
Interviewers are smart enough to make it out anyway.
Skills: Logical Thinking, Operating System Basics, Algorithm, Database Management, Data Structures, C++, C
College Name: NIT Bhopal
Motivation: Flat hierarchy.
No cabin culture.
Working at startup is always better because you get to learn a lot of things.
Decent salary.

Round: Test
Experience: Attempt at least 2 questions
Duration: 90 minutes
Total Questions: 4

Round: Technical Interview
Experience: The interviewer asked to write the full code for a couple of questions only.
Tips: Prepare puzzles.
Think loudly.
Ask for a hint if stuck.

Round: Technical Interview
Tips: Be honest with your interviewer. ;)

Skill Tips: Must be capable to solve puzzles as well as coding questions with good speed and accuracy.
Skills: Puzzle Solving Capability, Implementation of code using OOPS., Algorithm, Data Structures, Operating System Basics, Object Oriented Programming (OOP) Basics
College Name: NIT Bhopal
Motivation: Carwale currently has around 100-125 employees. So it's a good platform to learn new technology. The salary is also good.