Rahul Kumar Barnwal

Full-stack developer | Passionate about Problem Solving, Node.js, React, and Next.js | Tech mentor @ Polaris | Open Source Contributor | Sharing insights on coding, SaaS, and project building 🚀

Bangalore, Karnataka Joined on Apr 24, 2024 https://rahul-developer.vercel.app/

Education

B.Tech in Electronics and Communication Engineering | Vinoba Bhave University | Graduated Dec 2020

Pronouns

He/Him

Work

Senior Backend Developer | Tech Mentor @ Polaris | Open Source Contributor

Pinned

Rahul Kumar Barnwal

May 23

Google Stitch: The New AI UI Design Tool That Turns Prompts into Pixel-Perfect Interfaces

#stitch #googlestitch #ai #tool

2 min read

Rahul Kumar Barnwal

Jan 2

My Journey Through 2024 and Bold Predictions for 2025 🌟🔮

#devchallenge #newyearchallenge #techtrends #2025goals

3 min read

Cover image for LeetCode Challenge: 49. Group Anagrams - JavaScript Solution 🚀

Rahul Kumar Barnwal

Apr 1

LeetCode Challenge: 49. Group Anagrams - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

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Cover image for LeetCode Challenge: 242. Valid Anagram - JavaScript Solution 🚀

Rahul Kumar Barnwal

Jan 16

LeetCode Challenge: 242. Valid Anagram - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 290. Word Pattern - JavaScript Solution 🚀

Rahul Kumar Barnwal

Jan 15

LeetCode Challenge: 290. Word Pattern - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 205. Isomorphic Strings - JavaScript Solution 🚀

Rahul Kumar Barnwal

Jan 14

LeetCode Challenge: 205. Isomorphic Strings - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 383. Ransom Note - JavaScript Solution 🚀

Rahul Kumar Barnwal

Jan 13

LeetCode Challenge: 383. Ransom Note - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge 289: Game of Life - JavaScript Solution 🚀

Rahul Kumar Barnwal

Jan 12

LeetCode Challenge 289: Game of Life - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

3 min read

Cover image for LeetCode Challenge: 73. Set Matrix Zeroes - JavaScript Solution 🚀

Rahul Kumar Barnwal

Jan 11

LeetCode Challenge: 73. Set Matrix Zeroes - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

3 min read

Cover image for LeetCode Challenge: 48. Rotate Image - JavaScript Solution 🚀

Rahul Kumar Barnwal

Jan 10

LeetCode Challenge: 48. Rotate Image - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 54. Spiral Matrix - JavaScript Solution 🚀

Rahul Kumar Barnwal

Jan 9

LeetCode Challenge: 54. Spiral Matrix - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

3 min read

Cover image for LeetCode Challenge: 36.Valid Sudoku - JavaScript Solution 🚀

Rahul Kumar Barnwal

Jan 8

LeetCode Challenge: 36.Valid Sudoku - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

3 min read

Cover image for LeetCode Challenge: 76. Minimum Window Substring - JavaScript Solution 🚀

Rahul Kumar Barnwal

Jan 7

LeetCode Challenge: 76. Minimum Window Substring - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

3 min read

Cover image for 🔍 Mastering the Sliding Window Technique: A Developer's Guide

Rahul Kumar Barnwal

Jan 6

🔍 Mastering the Sliding Window Technique: A Developer's Guide

#algorithms #slidingwindow #datastructures #softwaredevelopment

3 min read

Cover image for LeetCode Challenge 30: Substring with Concatenation of All Words - JavaScript Solution 🚀

Rahul Kumar Barnwal

Jan 5

LeetCode Challenge 30: Substring with Concatenation of All Words - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

3 min read

Cover image for LeetCode Challenge: 3. Longest Substring Without Repeating Characters - JavaScript Solution 🚀

Rahul Kumar Barnwal

Jan 5

LeetCode Challenge: 3. Longest Substring Without Repeating Characters - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 209. Minimum Size Subarray Sum - JavaScript Solution 🚀

Rahul Kumar Barnwal

Jan 3

LeetCode Challenge: 209. Minimum Size Subarray Sum - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

3 min read

Cover image for LeetCode Challenge: 15. 3Sum - JavaScript Solution 🚀

Rahul Kumar Barnwal

Jan 2

LeetCode Challenge: 15. 3Sum - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

4 min read

Cover image for LeetCode Challenge: 11. 📦 Container With Most Water - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 31 '24

LeetCode Challenge: 11. 📦 Container With Most Water - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

3 min read

Cover image for LeetCode Challenge: 167. Two Sum II - Input Array Is Sorted - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 30 '24

LeetCode Challenge: 167. Two Sum II - Input Array Is Sorted - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 392. Is Subsequence - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 29 '24

LeetCode Challenge: 392. Is Subsequence - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

3 min read

Cover image for 🧩 LeetCode Challenge: Remove Element | Top Interview Questions [Java Solution]

Rahul Kumar Barnwal

Dec 28 '24

🧩 LeetCode Challenge: Remove Element | Top Interview Questions [Java Solution]

#java #leetcode #interview #programming

3 min read

Cover image for LeetCode Challenge: 125. Valid Palindrome - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 28 '24

LeetCode Challenge: 125. Valid Palindrome - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge 68: Text Justification - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 27 '24

LeetCode Challenge 68: Text Justification - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

3 min read

Cover image for 🧩 LeetCode Challenge: Merge Sorted Array | Top Interview Questions [Java Solution]

Rahul Kumar Barnwal

Dec 26 '24

🧩 LeetCode Challenge: Merge Sorted Array | Top Interview Questions [Java Solution]

#java #leetcode #interview #programming

3 min read

Cover image for LeetCode Challenge: 28. Find the Index of the First Occurrence in a String - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 26 '24

LeetCode Challenge: 28. Find the Index of the First Occurrence in a String - JavaScript Solution 🚀

3 min read

Cover image for LeetCode Challenge: 6. Zigzag Conversion - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 25 '24

LeetCode Challenge: 6. Zigzag Conversion - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 151. Reverse Words in a String - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 24 '24

LeetCode Challenge: 151. Reverse Words in a String - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

3 min read

Cover image for LeetCode Challenge: 14. Longest Common Prefix - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 23 '24

LeetCode Challenge: 14. Longest Common Prefix - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 58. Length of Last Word - JavaScript Solution🚀

Rahul Kumar Barnwal

Dec 22 '24

LeetCode Challenge: 58. Length of Last Word - JavaScript Solution🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 12. Integer to Roman - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 21 '24

LeetCode Challenge: 12. Integer to Roman - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 13. Roman to Integer - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 20 '24

LeetCode Challenge: 13. Roman to Integer - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 42. Trapping Rain Water - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 19 '24

LeetCode Challenge: 42. Trapping Rain Water - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 135. Candy - JavaScript Solution 🍬

Rahul Kumar Barnwal

Dec 18 '24

LeetCode Challenge: 135. Candy - JavaScript Solution 🍬

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 134. Gas Station - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 17 '24

LeetCode Challenge: 134. Gas Station - JavaScript Solution 🚀

#javascript #programming #interview #leetcode

2 min read

Cover image for LeetCode Challenge: 238. Product of Array Except Self - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 16 '24

LeetCode Challenge: 238. Product of Array Except Self - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 380. Insert Delete GetRandom O(1) - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 15 '24

LeetCode Challenge: 380. Insert Delete GetRandom O(1) - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

3 min read

Cover image for LeetCode Challenge: 274. H-Index - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 14 '24

LeetCode Challenge: 274. H-Index - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 45. Jump Game II - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 13 '24

LeetCode Challenge: 45. Jump Game II - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 55. Jump Game - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 12 '24

LeetCode Challenge: 55. Jump Game - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 122. Best Time to Buy and Sell Stock II - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 11 '24

LeetCode Challenge: 122. Best Time to Buy and Sell Stock II - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 121. Best Time to Buy and Sell Stock - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 10 '24

LeetCode Challenge: 121. Best Time to Buy and Sell Stock - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 189. Rotate Array - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 9 '24

LeetCode Challenge: 189. Rotate Array - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 169. Majority Element - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 8 '24

LeetCode Challenge: 169. Majority Element - JavaScript Solution 🚀

#javascript #leetcode #interview #programming

2 min read

Cover image for LeetCode Challenge: 80. Remove Duplicates from Sorted Array II - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 7 '24

LeetCode Challenge: 80. Remove Duplicates from Sorted Array II - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 26. Remove Duplicates from Sorted Array - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 6 '24

LeetCode Challenge: 26. Remove Duplicates from Sorted Array - JavaScript Solution 🚀

#javascript #programming #interview #leetcode

2 min read

Cover image for LeetCode Challenge: 27. Remove Element - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 5 '24

LeetCode Challenge: 27. Remove Element - JavaScript Solution 🚀

#javascript #programming #leetcode #interview

2 min read

Cover image for LeetCode Challenge: 88. Merge Sorted Array - JavaScript Solution 🚀

Rahul Kumar Barnwal

Dec 4 '24

LeetCode Challenge: 88. Merge Sorted Array - JavaScript Solution 🚀

#javascript #leetcode #interview #programming

3 min read

Cover image for 🚀 Introducing Claude 3.5 Sonnet & Haiku: The AI Revolution is Here! 💻✨

Rahul Kumar Barnwal

Oct 24 '24

🚀 Introducing Claude 3.5 Sonnet & Haiku: The AI Revolution is Here! 💻✨

#ai #api #programming

3 min read

Cover image for 🚀 My 2024 Hacktoberfest Journey: A Contributor's Reflection 🌍💻

Rahul Kumar Barnwal

Oct 8 '24

🚀 My 2024 Hacktoberfest Journey: A Contributor's Reflection 🌍💻

#devchallenge #hacktoberfestchallenge #hacktoberfest #opensource

3 min read

Cover image for Earth Day Frontend Challenge

Rahul Kumar Barnwal

Apr 24 '24

Earth Day Frontend Challenge

#devchallenge #frontendchallenge #css #javascript

7 min read

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