Kushagra Bansal

Designed and developed a complete server-driven solution for Stripe terminal integration using AWS services like SAM, Lambda, and AppSync. Enabled POS payments on physical devices by using GraphQL APIs and AWS Cognito for secure authentication. Implemented webhooks to create a gateway for 3rd party services & GraphQL subscriptions to create a channel for publishing backend events that frontend can capture. Implemented complete coupon and promo code system from end-to-end for salon service booking app. Optimised codebase using AWS Lambda Layers that significantly reduced code repetition, did error handling for over 250 apis.

Building personalized apps targeting students who cannot afford costly customizable apps like music player, memo keeper, wishlist etc. One-to-one Private Chat App - Telegram like synced, end-to-end encrypted chat app for a couple. Real-time online status update, photo & text exchange with login system & real and fake access-password to divert intruders. MacLarens Pub - Personalized How I Met Your Mother theme based anniversary app consisting of yellow umbrella, playbook, vinyl music player, chat flyouts, and many other props. Photo Gallery - A Photo gallery app to be given away as a 1st position prize for a hackathon in a college.

Designed efficient architecture for, and implemented Instagram like stories feature with complete privacy management. Implemented Automatic User Ranking System similar to competitive games. Implemented Poll system (Voting) with dynamic poll creation and realtime user engagement using Websockets. Implemented HLS Microservice for videos using EFS, Python, Redis, SQS and Custom Webhook. Delivered interest based videos, platform trending videos 1st iteration working model in just 3 days. Modularized recommendation algo config & populated in Redis to change settings with an API eliminating backend release. Designed & implemented another video recommendation algorithm using Matrix Factorization. Reduced bookmarks list api response time by over 50% & reduced server operations by changing elasticsearch indexing for posts Optimised database performance by changing delete operation logic by implementing lazy delete technique instead of realtime. Contributed to migration of cloud infrastructure from AWS to GCP alongside Google SADA team. Developed JavaScript scripts for migrating data between MongoDB, Elasticsearch, & Redis. Developed numerous Python scripts to automate complex tasks, streamlining processes & minimizing manual intervention.

Built a complete healthcare & e-commerce app with various health trackers, calculators, monitors, order tracking, coupons system. SSO login for Google, FB & phone number and email sign-in using JWT token auth, Razorpay and PayU payment gateways. Step tracker with real-time location with Google maps API, weight, sleep, period trackers, etc.

Built a Covid-19 leads provider app at peak pandemic where users can look for, or provide covid related resource leads - O2, remdesivir, hospital beds, plasma, meds etc., verified by the contributing team. Led a VIP team of 10+ & a volunteering team of 250+ people to manage & verify data.

Built responsive web app UI elements with proper state management and animations like carousels, accordion, sidebar, navbar with parallax, testimonials, sitewide dark mode, rich text, etc. GSL & PE - Combined Nuxt2 & Nuxt3 projects and aligned tailwind configs, modules & components for compatibility. WShipt & Xhibiter - Combined Next12 & Next13 projects and aligned tailwind configs, modules & components for compatibility.