Ecolab Digital Center Software Developer Interview Questions and Answers

Q1. Tell me about yourself
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Q2. What is the difference between HTTp and HTTPS
Ans. 
HTTP is unsecured protocol while HTTPS is secured protocol using SSL/TLS encryption.
• HTTP stands for Hypertext Transfer Protocol, while HTTPS stands for Hypertext Transfer Protocol Secure.

• HTTPS uses SSL/TLS encryption to secure the communication between the client and server, while HTTP does not.

• HTTPS uses port 443 by default, while HTTP uses port 80.

• HTTPS URLs begin with 'https://' and are secured with a padlock icon i...read more
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It was straightforward

Q1. Was easy explaining about role
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Q2. Previous experience. How to handle the role and expectation. Work schedule. Explain about the team
Ans. 
The candidate should discuss their previous experience, how they handle their role and expectations, their work schedule, and provide an explanation about their previous team.
• Discuss previous experience in software engineering roles

• Explain how you handled your role and met expectations in previous positions

• Describe your typical work schedule and any flexibility you have

• Provide an overview of your previous team, their s...read more
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First round of aptitude test. They gave 40 question in 1 hr. Question based on general quantitative aptitude.

There were total 8 questions in 2 hrs. 5 questions on Data structures algorithm and 3 questions on DBMS

Round duration - 20 minutes
Round difficulty - Easy

This was the MCQ round and consisted of 19 MCQ's.

Round duration - 90 minutes
Round difficulty - Easy

This was face to face interview round and was held after the aptitude and GD round. It was in the evening. 
 

Q1. How do you detect a loop in a linked list?
Ans. 
To detect a loop in a linked list, we can use the Floyd's Cycle Detection Algorithm.
• Use two pointers - slow and fast, where slow moves one step at a time and fast moves two steps at a time.

• If there is a loop, the two pointers will eventually meet at some point within the loop.

• To detect the start of the loop, reset one pointer to the head and move both pointers one step at a time until they meet again.
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Q2. How would you implement merge sort on a linked list?
Ans. 
Merge sort on a linked list involves dividing the list into halves, sorting each half, and then merging the sorted halves.
• Divide the linked list into two halves using slow and fast pointers

• Recursively sort each half

• Merge the sorted halves back together
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Aptitude test

Current affairs

Q1. Puzzle , sql related questions
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