24 questions · from 2 interviews
Wissen Technology interview questions
Every question candidates reported from their Wissen Technology interviews, most frequently asked first. Each links to the write-up it came from, so you can see the round and how it went.
Wissen Technology coding and DSA questions
- 01
Flatten Nested Array
Write a JavaScript function to flatten a nested array (e.g., [1, [2, [3, 4]], 5] becomes [1, 2, 3, 4, 5] ).
Medium · From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 02
camelCase to Capital_Snake_Case Conversion
Write a function that converts a camelCase string into CapitalSnakeCase. If the input is not a string, it should return an empty string. For example, thisIsATest should become ThisIsATest .
Medium · From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 03
Find Pivot Index
The first DSA coding question in the OA round was finding the pivot index.
Easy · From Wissen Technology | SDE2 | Face-to-Face Interview Experience
Wissen Technology other questions
- 01
Difference between Functional and Class Components
Explain the key differences between functional components and class components in React.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 02
Importance of Class Components
Discuss why developers should still learn about class components despite the widespread adoption of functional components with hooks.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 03
State Manipulation with Alert
Describe or implement a mechanism where a state variable, initialized to 10, decreases to 0. Upon reaching 0, an alert displaying 'Test' should be shown, and then the state should start increasing back to 10.
Medium · From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 04
JavaScript IIFE Output Question
Determine the output of the following JavaScript Immediately Invoked Function Expression (IIFE) code snippet: (function immediateA(a) { return (function immediateB(b) { console.log(a); })(1); })(0);
Easy · From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 05
Experience with State Management Libraries
List and discuss state management libraries you have experience working with in frontend development.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 06
Need for State Management Libraries
Explain the fundamental reasons why state management libraries are necessary in complex frontend applications.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 07
Props Drilling and React Context
Define 'props drilling' in React and explain how the React Context API helps to mitigate or solve this problem.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 08
Disadvantages of React Context
Discuss the potential disadvantages or drawbacks of using React Context.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 09
Setting up Redux Toolkit
Describe the steps and considerations for setting up Redux Toolkit in a React application.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 10
Experience with React Hooks
List and briefly explain the React hooks you have experience working with.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 11
Difference between useMemo and useCallback
Explain the difference between useMemo and useCallback hooks in React, providing examples for their use cases.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 12
React Application Performance Optimization
Discuss various strategies and techniques to improve the performance of a React application.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 13
What is React Virtual DOM?
Explain what the Virtual DOM is in the context of React and its purpose.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 14
React Virtual DOM Comparison
Describe the process React uses internally to compare two Virtual DOMs when state or props change.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 15
React Reconciliation Algorithm
Identify the name of the algorithm and the process React uses for comparing Virtual DOMs and updating the real DOM.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 16
Experience with Server-Side Rendering (SSR)
Discuss your experience with Server-Side Rendering (SSR) in web development, particularly with React.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 17
Default React Rendering Model
Identify the default rendering model utilized by React applications.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 18
SSR vs. CSR Comparison
Explain the key differences between Server-Side Rendering (SSR) and Client-Side Rendering (CSR) in web development.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 19
What is React Hydration?
Define 'hydration' in the context of React and server-side rendering.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 20
React Suspense and its Utility
Explain what React Suspense is and describe its utility and benefits in a React application.
From Wissen Technology | Frontend Developer | August 2025 | 3.5 YOE
- 21
Find Employee with Second Highest Salary
An SQL question in the OA round was finding the employee with the second highest salary.
Easy · From Wissen Technology | SDE2 | Face-to-Face Interview Experience
Wissen Technology interview questions FAQ
What questions are asked in Wissen Technology interviews?
Candidates reported 24 distinct questions across 2 Wissen Technology interviews. 3 coding and DSA questions, 21 other questions.
How difficult are Wissen Technology interview questions?
Of the questions candidates rated, 50% were easy, 50% medium and 0% hard.