FIS Testing Engineer Lead Interview Questions and Answers

Q1. Explain SOLID principle
Ans. 
SOLID is a set of five design principles to make software designs more understandable, flexible, and maintainable.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Software entities should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses without aff...read more
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Q2. Memory Allocation in Java
Ans. 
Memory allocation in Java is managed by the JVM using the heap and stack memory areas.
• Java uses the heap memory for storing objects and the stack memory for storing method calls and local variables.

• Memory allocation in Java is automatic and managed by the garbage collector.

• Java provides the 'new' keyword to allocate memory for objects on the heap.

• Primitive data types are stored on the stack, while objects are stored on
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Q1. Data structures and algorithms,2 questions were there one of array and 1 of string
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Q2. 2 question of medium and low difficulty
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Q1. Automation round based on resume
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Q1. Manual and automation testing
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Q2. Selenium and manual testing
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Round duration - 60 minutes
Round difficulty - Easy

Started with the introduction.
Then there were two-three coding questions.
Some OS and DBMS concepts were asked.
Questions related to testing were also included.

Q1. Reverse the String
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...read more
Ans. Optimal Solution
• Traverse the string and swap the first character with the last character, the second character with the second last character and so on.
• Basically, you need to swap the i-th character with the (N-i-1)-th character where N is the length of the string and 0-based indexing is considered.
Space Complexity: O(1)Explanation:
O(1).
 
In the worst case, only constant extra space is required.
Time Complexity: O(...read more
Answered by CodingNinjas
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Q2. Number And Digits
You are given a positive number ‘N.’ You need to find all the numbers such that the sum of digits of those numbers to the number itself is equal to ‘N.’
For example:
You are given ‘N’ a...read more
Ans. Brute Force
In this approach, we iterate through the numbers from 1 to N. We will find the sum of its digits and add it to the integer itself for each number. Then, we check if the obtained sum is equal to N.
We create a recursive function called sumOfDigits(num) that returns the sum of digits of the number num.
 
Algorithm:
• The function sumOfDigits(num) 
  • If num is equal to 0 return 0
  • Otherwise, return num % 10 + su...read more
Answered by CodingNinjas
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Round duration - 60 minutes
Round difficulty - Medium

This was quite a tough round that can be cleared only by practice and understanding the problem. They asked about the profile first, then questions related to testing, SDLC, and so on. And then, I was asked to write test cases for two to three problems. Writing a test case was a task in this round. The interview was a senior testing engineer and was very friendly and helpful also and answered all my queries related to work.

Q1. Technical Questions
Test Cases for Paytm Wallet (at least 10)
You are downloading a file in your system, write test cases for this situation (5-6 TEST CASES)
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