Mastree QA Engineer Interview Questions and Answers

Q1. Polymorphism real time example
Ans. 
Polymorphism is the ability of an object to take on many forms. A real-time example is a Shape class with different subclasses like Circle, Square, and Triangle.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables code reusability and flexibility in object-oriented programming.

• For example, a Shape class can have a draw() method that is overridden by its subclasses ...read more
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Q1. Authentication and authorisation difference
Ans. 
Authentication verifies the identity of a user, while authorization determines what actions they can perform.
• Authentication confirms the user's identity through credentials like username and password.

• Authorization grants or denies access to specific resources or actions based on the user's authenticated identity.

• Authentication precedes authorization in the security process.

• Example: Logging into a website with a usernam...read more
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Q2. One coding questions
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Q1. One aptitude questions
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Q1. How much salary expected
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Q1. Polyfills and Logical
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Q2. List in react and the input box
Ans. 
Answer on how to list in react and the input box
• Use the map function to create a list in React

• Use the state to store the input value

• Use onChange event to update the state when the input value changes

• Use onSubmit event to handle the form submission
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40 mins. Basic maths

4 scenarios were given and you have to make interactive doc from those.

Q1. What are your strong topics in math's?
Ans. 
My strong topics in math's include algebra, calculus, and statistics.
• Algebra

• Calculus

• Statistics
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Q1. Question on Binary trees: if symmetric, easy string question using hashmap
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Q2. If we are hosting a live test how to show real time ranking, HLD for this and what algorithms can we use
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Q1. Database schema design for a feature where user can be free, gold, platinum.
Ans. 
Use a user table with a column for user type (free, gold, platinum)
• Create a user table with columns for user ID, name, email, user type

• Use a separate table for user types with columns for type ID and type name

• Establish a one-to-many relationship between user and user type tables

• Example: user table - user_id, name, email, type_id; user_type table - type_id, type_name
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Q1. HLD for live rank dashboard for a live test where millions of users are doing test
Ans. 
High-level design for a live rank dashboard for a live test with millions of users.
• Use a scalable architecture to handle millions of users concurrently.

• Implement real-time data processing to update ranks dynamically.

• Utilize caching mechanisms to improve performance and reduce load on the database.

• Design a user-friendly interface with intuitive data visualization.

• Include features for filtering, sorting, and searching to
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Q1. Explain about Event loop
Ans. 
Event loop is a mechanism that allows for asynchronous programming by handling events and callbacks.
• Event loop is responsible for handling and executing events and callbacks in a non-blocking manner.

• It continuously checks the event queue and processes events one by one.

• Event loop is commonly used in JavaScript for handling asynchronous operations like setTimeout, setInterval, and AJAX requests.
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Ask to create a database design and API for a todo list app

Q1. Why do you want to join Byjus
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