Ecolabs interview experience Real time questions & tips from candidates to crack your interview
Software Developer
Ecolabs
4 rounds | 6 Coding
problems
Selected Interview preparation journey
Journey
I was preparing for the interview from 2nd year by improving my problem solving using leetcode ad Hackerrank.
It was oncampus offer for me..So I had good problem solving skill and good knowledge in CS fundamentals..
Application story
This was a oncampus offer for me. I got link through my college. And I got shortlisted for online assessment. Then interview conducted through virtual mode. Finally I got offer. Around 300 students applied only 4 got the offer including me..
Why selected/rejected for the role?
I have been practicing coding in leetcode and Hackerrank.So I have good problem solving skill. And also I have basic understanding of CS fundamentals. I prepared using interviewbit website..
Preparation
Duration: 1 month
Topics: Python, Database management system, OOPS, computer networking, Operating system
Tip 1 : prepare your resume according to the role you apply.
Tip 2 : Do atleast 2 good projects and add it in resume.
Tip 3 : Improve your problem solving skill by leetcode.
Application process
Where: Campus
Eligibility: 7 CGPA, Good problem solving skill
Tip 1 : Add 2 good projects related to your interested technology.
Tip 2 : Add your coding profiles in resume that help you to get selected in resume shortlisting.
Interview rounds
01
Round
Easy
Online Coding Interview
Duration80 mins
Interview date15 Jun 2022
Coding problem2
Morning 10'o clock online assessment started
1. Armstrong Number
Easy
15m average time
85% success
0/40
Asked in companies
You are given an integer ‘NUM’ . Your task is to find out whether this number is an Armstrong number or not.
A k-digit number ‘NUM’ is an Armstrong number if and only if the k-th power of each digit sums to ‘NUM’.
Example
153 = 1^3 + 5^3 + 3^3.
Therefore 153 is an Armstrong number.
Problem approach
Tip 1: prepare all cocubes Pattern old questions
Tip 2: cocubes Pattern is very important to practice to get good cutoff of this round.
Tip 3: prepare and practice string based questions in leetcode
2. Star Pattern
Easy
10m average time
85% success
0/40
Asked in companies
Print the following pattern
Pattern for N = 4
The dots represent spaces.
Problem approach
Tip 1: prepare and practice pattern based questions
Tip 2: do prepare all cocubes Pattern questions.
Tip 3: collect all old cocubes Pattern coding questions and do solve
02
Round
Medium
Face to Face
Duration60 mins
Interview date16 Jun 2022
Coding problem1
Morning at 10 'o clock interview started..
The interview was good and interviewer made me feel comfortable to answer questions.
1. Reverse the String
Easy
15m average time
85% success
0/40
Asked in companies
You are given a string 'STR'. The string contains [a-z] [A-Z] [0-9] [special characters]. You have to find the reverse of the string.
For example:
If the given string is: STR = "abcde". You have to print the string "edcba".
follow up:
Try to solve the problem in O(1) space complexity.
Problem approach
Tip 1: practice basic techniques of string questions.
Tip 2: practice all important questions of leetcode problems
Tip 3: make note of techniques to solve problems
03
Round
Medium
Face to Face
Duration60 mins
Interview date17 Jun 2022
Coding problem2
Morning time interview started in WebEx platform.
1. Networking Questions
What is network
Types of OSI model
Problem approach
Tip 1: Try to Study this questions for preparation
Tip 2: Try to learn the basics of CN
Tip 3: Try to understand the concepts by using real-time concepts.
2. OS Questions
What is Semaphore
Types of scheduling algorithms
Problem approach
Tip 1: Try to practice more questions from interviewbit
Tip 2: Learn all scheduling algorithms in os
Tip 3: Try to practice Os problems
04
Round
Easy
HR Round
Duration15 mins
Interview date17 Jun 2022
Coding problem1
After completing technical interview and got shortlisted for HR interview. It conducted in the evening time.
1. Basic HR Questions
Just background verification
Introduce yourself
Why do you want to join ecolabs
Problem approach
Tip 1: Just be confident while talking to HR
Tip 2: Ask questions about the company
Tip 3: Be curious about the joining and express to HR.
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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