Wissen Technology Interview Questions, Process, and Tips

Given online test , with 3 coding questions
2 from java and 1 from sql
aptitude question was related to solid principle, output of a threaded code , design principle question

Q1. Explain about microservices
Ans. 
Microservices are a software architecture design where applications are broken down into smaller, independent services that communicate with each other through APIs.
• Microservices allow for greater flexibility and scalability in software development.

• Each microservice is responsible for a specific function or feature of the application.

• Microservices can be developed, deployed, and scaled independently of each other.

• They ...read more
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Q2. What design pattern you used in your microservice>
Ans. 
I used the Service Registry design pattern in my microservice.
• Service Registry pattern is used to dynamically register and discover services in a distributed system.

• It helps in decoupling service consumers from service providers.

• Examples of Service Registry tools include Netflix Eureka and Consul.
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You have to solve one technical paper containing 6 questions.

Q1. Design Facebook Classes
Ans. 
Design classes for different features of Facebook platform
• Create a User class with attributes like name, email, password, friends list

• Create a Post class with attributes like content, likes, comments, timestamp

• Create a Comment class with attributes like content, user, timestamp

• Create a Like class with attributes like user, post

• Consider inheritance for classes like PhotoPost, VideoPost, etc.
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Q2. How does netflix works?
Ans. 
Netflix is a streaming service that offers a wide variety of TV shows, movies, anime, documentaries, and more on thousands of internet-connected devices.
• Netflix operates on a subscription-based model where users pay a monthly fee to access content.

• Users can stream content on various devices such as smart TVs, smartphones, tablets, and computers.

• Netflix uses algorithms to recommend content based on users' viewing histor...read more
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Q1. Where do you see yourself in 5 years
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Q2. Family background and why we should hire you.
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Q1. Basic Excel Questions Introduced Yourself Basic Finance Questions
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Q2. What is Vlookup What is Inflation and Deflation
Ans. 
Vlookup is a function in Excel used to search for a value in a table and return a corresponding value.
• Vlookup stands for 'Vertical Lookup'

• It is commonly used in Excel to search for a value in the leftmost column of a table and return a value in the same row from a specified column

• For example, =VLOOKUP(100, A1:B10, 2, FALSE) would search for the value 100 in column A and return the corresponding value in column B
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Two coding questions in Pyton one medium and one hard

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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