UKG Principal QA Engineer Interview Questions and Answers

Challenges on Leetcode that are classified as hard and can be coded using an IDE along with test cases.

Low level design of parking lot

Q1. System design of a scalable distributed system
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Q1. Print missing number in given array
Ans. 
Find and print the missing number in a given array of strings.
• Convert the array of strings to an array of integers for easier manipulation.

• Iterate through the array to find the missing number by comparing consecutive elements.

• Print the missing number once found.
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Q2. Print string in reverse
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Reverse a string in an array of strings
• Iterate through each string in the array

• Use a loop to reverse each string character by character

• Store the reversed strings in a new array
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Q1. How do you manage differences in team
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Q2. How do you test faulty ATM
Ans. 
To test a faulty ATM, simulate various scenarios like card reader failure, cash dispenser malfunction, network connectivity issues, etc.
• Simulate card reader failure by inserting a damaged card or a card with a magnetic strip issue.

• Test cash dispenser malfunction by requesting cash withdrawal and observing if the correct amount is dispensed.

• Check for network connectivity issues by trying to access online banking service...read more
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Aptitude test was easy to clear

Coding test was ok to clear

Q1. Technical was easy to medium
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Q1. Tell me about your self
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Q1. I have very bad experience with this company. HR scheduled technical round on Monday 11 AM. panel was not aware and joined 30 mins late. Then he started asking questions unrelated to my profile. I said i h...read more
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Q2. Question related to - 1. @DataProviders of TestNG 2. Alternative of excel sheet to get our test data in automation framework 3. how to set up jenkins pipeline, how to create job 4. how to give global par...read more
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Q1. Java programming
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Q2. Robot framework
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Q1. Api testing, what is path parameter
Ans. 
Path parameter is a part of the URL that comes after the endpoint and is used to identify a specific resource.
• Path parameters are used to pass data to the API endpoint in the URL

• They are specified within curly braces {} in the URL path

• Path parameters are used to identify a specific resource or entity

• Example: /api/users/{userId} where userId is a path parameter
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Q2. Robot framework
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Q1. Oops concepts in c#
Ans. 
Oops concepts in C# include inheritance, polymorphism, encapsulation, and abstraction.
• Inheritance allows a class to inherit properties and behavior from another class.

• Polymorphism allows objects to be treated as instances of their parent class.

• Encapsulation hides the internal state of an object and only exposes necessary functionality.

• Abstraction focuses on the essential characteristics of an object while hiding irrele
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Q2. Automation Framework related questions
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Q1. Questions on whole QA Testing, Windows
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Q2. Types of testing
Ans. 
Types of testing include functional testing, non-functional testing, manual testing, automated testing, regression testing, and performance testing.
• Functional testing: Testing the functionality of the software against the requirements.

• Non-functional testing: Testing aspects like performance, usability, and security.

• Manual testing: Testing performed manually by QA engineers.

• Automated testing: Testing performed using aut...read more
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Q3. How to test a particular scenario
Ans. 
To test a particular scenario, create test cases covering all possible inputs and expected outcomes.
• Identify the specific scenario to be tested

• Create test cases for different inputs and expected outcomes

• Execute the test cases and analyze the results

• Perform regression testing to ensure no new issues are introduced
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Q4. Bugs validation
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Simple coding on python

Q1. How you will validate the input you are giving while login if its correct but not with the success message and algorithm for it
Ans. 
Validate input by checking for specific error messages instead of success message
• Check for error messages related to incorrect input (e.g. 'Invalid username/password')

• Verify the response code or status returned after login attempt

• Look for any specific patterns in the error messages that indicate incorrect input
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