Tesco Senior Software Developer Interview Questions and Answers

2 DSA questions and some MCQ on Java and Spring

Q1. Longest palindromic substring
Ans. 
A palindromic substring is a string that reads the same forwards and backwards.
• Use dynamic programming to find the longest palindromic substring.

• Start by considering each character as the center of a potential palindrome.

• Expand outwards from each center to check for palindromes of odd and even lengths.
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Q2. Remove duplicates in place from a 1D array
Ans. 
Remove duplicates from a 1D array of strings in place
• Iterate through the array and use a HashSet to keep track of unique elements

• Replace duplicates with null or an empty string to remove them in place
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Q1. Project discussion
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Q2. Search min element in a rotated sorted array with duplicate elements
Ans. 
Search for the minimum element in a rotated sorted array with duplicate elements.
• Use binary search to find the minimum element in the rotated sorted array.

• Handle the case where duplicate elements are present by adjusting the search conditions.

• Consider cases where the array is not rotated or contains only one element.
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Q3. Ways of declaring singleton class
Ans. 
A singleton class is a class that can only have one instance created throughout the application.
• Declare a private static instance variable of the class

• Create a private constructor to prevent external instantiation

• Provide a public static method to access the instance
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Q1. Project discussion
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Q2. Behavioural questions
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3 sum problem was asked to complete

Take home project to design app

Q1. .net core framework, .net core MVC, Vue js , js , SQL
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Q1. .net core question
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Q2. .net mvc questions
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Q3. Authentication in .net
Ans. 
Authentication in .NET involves verifying the identity of users accessing a system.
• Use ASP.NET Identity for user authentication and authorization

• Implement OAuth for secure authentication with third-party services

• Utilize JWT tokens for stateless authentication

• Implement multi-factor authentication for added security
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Q4. About your project architecture
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Q5. Sql related questions
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Q6. Entity framework
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Q1. Array, Tree based questions
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Q1. Managerial round with a dive into the projects
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Moderate level. It was easy to crack. There was few aptitude and coding questions associated

Q1. Questions on SQL
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Q1. Tell me about yourself
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Q2. Tell positive and negative points about you
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Q1. Laravel based questions
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Q1. Basic questions
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Q1. What is garbage collector in python
Ans. 
Garbage collector in Python is a built-in feature that automatically manages memory by reclaiming unused memory space.
• Garbage collector in Python helps in automatically deallocating memory of objects that are no longer in use.

• It prevents memory leaks by freeing up memory that is no longer needed.

• Python's garbage collector uses reference counting and a cycle-detecting algorithm to manage memory efficiently.
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Mettl test , scored 90% still didn't get shortlist for tech round

Q1. Web services spring react
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Q2. Java code string
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