Wissen Technology Software Engineer Interview Questions, Process, and Tips

Q1. Given 3 threads print a number from 1 to 10 in sequence
Ans. 
Use synchronized blocks or locks to ensure threads print numbers in sequence.
• Use synchronized blocks or locks to ensure only one thread can access the shared resource (number to be printed) at a time.

• Use a shared variable to keep track of the current number to be printed and update it after each thread prints its number.

• Use a loop to iterate from 1 to 10 and have each thread check if it is its turn to print the number.
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Q2. Core Java related questions
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Coding test with 2 questions

Q1. Best time buy and sell stocks
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It had MCQ based Technical question

Q1. Version of React Js
Ans. 
React JS is a JavaScript library for building user interfaces.
• React JS is maintained by Facebook.

• It allows developers to create reusable UI components.

• React JS uses a virtual DOM for better performance.

• Current stable version is 17.0.2 (as of September 2021).
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Q2. Advantages of React Js
Ans. 
React Js offers fast rendering, reusable components, virtual DOM, and easy integration with other libraries.
• Fast rendering due to virtual DOM

• Reusable components for efficient development

• Easy integration with other libraries like Redux

• Support for server-side rendering for improved SEO

• One-way data binding for predictable data flow
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Q3. Hoisting, Closuers, IIF, coding questions, React Js Platform question
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Q1. What is Closures
Ans. 
Closures are functions that have access to variables from their containing scope even after the function has finished executing.
• Closures allow functions to maintain access to variables from their parent scope

• They are commonly used in event handlers and callbacks

• Closures can be used to create private variables in JavaScript
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Q2. React Technical Round, Debouce, Bubbling, Delegation, Promises, etc
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Q1. React Technical Machine Code
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Q2. Map Filter Reduce Question, Custom Hook, Etc
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Basic java oops and coding question

Q1. DSA and java basics
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Q1. Again DSA and java advanced
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Q1. Develop chat app
Ans. 
Develop a chat app for real-time communication
• Use WebSocket for real-time communication

• Implement user authentication and authorization

• Design a user-friendly interface with features like emojis and file sharing
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Duration was for an hour, included basic front end questions

Q1. Explain component lifecycle in React
Ans. 
Component lifecycle in React refers to the series of methods that are invoked at different stages of a component's existence.
• Mounting phase: constructor, render, componentDidMount

• Updating phase: render, componentDidUpdate

• Unmounting phase: componentWillUnmount
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Q2. Write a component to display a table
Ans. 
A component to display a table in a software application
• Use HTML and CSS to create the structure and styling of the table

• Use JavaScript to populate the table with data dynamically

• Consider adding features like sorting, filtering, and pagination for better user experience
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DSA and Algo. Questions on Arrays and Strings.