Foxberry technologies Pvt Ltd interview experience Real time questions & tips from candidates to crack your interview
React developer
Foxberry technologies Pvt Ltd
1 rounds | 2 Coding
problems
Selected Interview preparation journey
Journey
I prepared for this interview over the past month with a focused approach. Since this is a React.js developer role, I revised React fundamentals all the way up to advanced concepts — covering components, hooks, context API, performance optimization, and React internals. Alongside, I practiced problem-solving, especially with JavaScript core functions and common interview-style questions like arrays, strings, and promises, so that I’m confident in both React and the underlying JavaScript that powers it
Preparation
Topics: React.js, Javascript, Html/CSS
Application process
Where: Coding Ninjas Placement Cell
Eligibility: Any graduate
Interview rounds
01
Round
Medium
Online Coding Interview
Duration
Interview date9 Sep 2025
Coding problem2
1. Key React.js Interview Questions
- What is React?
- What is a functional component?
- What is a hook?
- What is the Context API?
- Difference between useContext hook and Context API.
- Difference between functional component and class component.
- What are Promises?
- What is Virtual DOM?
- Advantages & Disadvantages of Virtual DOM.
- What is useCallback hook?How does React work internally?
2. First Non-Repeating Character in a String
Write a function that takes a string as input and returns the first character that does not repeat anywhere in the string. If all characters are repeating, the function should return an appropriate indication.
Problem approach
- Understand the requirement – what the input and expected output are.
- Think about frequency – determine that you need to know how many times each character appears.
- Choose a data structure – hash map / dictionary to store character counts.
- First pass – loop through the string and populate the frequency map.
- Second pass – loop through the string again to find the first character with count = 1.
- Handle edge cases – empty string or no unique character.
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