10+ Quality Assurance Engineer 3 Interview Questions and Answers

To check backward compatibility in API after BE changes are deployed on PROD, perform regression testing on existing functionalities.

• Perform regression testing on existing API functionalities to ensure they still work as expected after BE changes

• Check if any existing API endpoints have been deprecated or modified due to BE changes

• Verify if any new API endpoints have been added and test their functionality

• Ensure that the API responses are consistent with the previous versions

• T...read more

Implemented App automation using Selenium WebDriver and Appium for regression testing and continuous integration.

• Used Selenium WebDriver for web application automation

• Utilized Appium for mobile application automation

• Implemented automation scripts for regression testing

• Integrated automation tests into continuous integration pipelines

Use network monitoring tools and simulate different network conditions to test network latency in mobile apps.

• Use network monitoring tools like Wireshark or Charles Proxy to analyze network traffic and identify latency issues.

• Simulate different network conditions (3G, 4G, WiFi, etc.) using tools like Network Link Conditioner on iOS or Android Emulator on Android.

• Measure latency by sending requests to a server and calculating the time taken for the response to be received.

• Test...read more

POST method is more secure than GET method for transmitting sensitive data.

• POST method sends data in the request body, making it more secure as the data is not visible in the URL.

• GET method sends data in the URL, which can be visible in browser history, server logs, and can be easily intercepted.

• POST method is recommended for transmitting sensitive information like passwords, credit card details, etc.

• GET method is commonly used for retrieving data from the server without send...read more

Program that prints 1 if user inputs 0, and 0 if user inputs 1.

• Create a function that takes user input as parameter

• Check if input is 0, then print 1. If input is 1, print 0

• Handle invalid inputs if necessary

Update the name of employee with 3rd highest salary in SQL

• Use a subquery to find the 3rd highest salary

• Join the subquery with the EMPLOYEE table on salary to get the employee name

• Use the UPDATE statement to update the name of the employee

A RACE condition is a situation in which the outcome of a program depends on the order of execution of its components.

• Occurs in concurrent programming when multiple threads access shared data and the outcome depends on the order of execution

• Can lead to unpredictable behavior and bugs in the program

• Example: Two threads trying to increment the same variable simultaneously can result in incorrect values due to race condition

GET retrieves data, POST submits data, PUT updates data, PATCH partially updates data

• GET is used to retrieve data from a server

• POST is used to submit data to a server

• PUT is used to update existing data on a server

• PATCH is used to partially update existing data on a server

HTTP status codes are standardized codes used to indicate the result of a HTTP request.

• 1. 2xx - Success: Request was successful (e.g. 200 OK)

• 2. 3xx - Redirection: Further action needs to be taken (e.g. 301 Moved Permanently)

• 3. 4xx - Client Error: Request cannot be fulfilled (e.g. 404 Not Found)

• 4. 5xx - Server Error: Server failed to fulfill a valid request (e.g. 500 Internal Server Error)