@shubhamsinghbundela

Building a Paytm-Style Payments Backend with Bun, TypeScript, Express & MongoDB Transaction

2d ago · 32 min read · Digital wallets have become a part of everyday life. We transfer money to friends. We split bills. We pay merchants. We check balances before making payments. But behind every wallet application lies

Building a ShelfLife Household Inventory Tracker — Frontend

May 20 · 66 min read · In the previous blog, we designed and built the backend architecture for ShelfLife — a collaborative household inventory tracking application focused on reducing food waste. Backend Blog: https://shub

Building a ShelfLife Household Inventory Tracker - Backend

May 19 · 38 min read · In many shared households, managing groceries becomes messy over time. Multiple people live together, Everyone buys food Items get stored in different places Expiry dates are ignored Food gets was

Sliding Window

Apr 28 · 3 min read · Problem You are given an array of size N and an integer K. Your task:Find the maximum sum of any subarray of size exactly K Understanding the Problem Let’s take an example: arr = [2, 1, 5, 1, 3, 2] k

Aggressive Cows Problem using Binary Search

Apr 28 · 4 min read · Problem Core Idea You are not directly placing cows. Instead, you are guessing the answer (minimum distance) and checking: “Is it possible to place all cows with at least this distance?” Goal Find