Kripanshu Singh

I'm a founding full-stack engineer with a bias for shipping. Over the past 2 years, I've owned the entire product lifecycle, from system design to deployment, as the sole engineer at CongKong, a South Korean startup where I built 5 production-grade real-time platforms sustaining 900+ concurrent users at sub-150ms p99 latency.

Before that, I built backend infrastructure for India's national health registry (NHPR/HPR) at Aarogya ID, handling Aadhaar-linked identity verification and cutting API latency by 40%. I also built a multi-platform analytics dashboard at Messold Technologies used by 500+ clients to visualize $1M+ in monthly ad spend.

My stack runs deep across React/Next.js frontends, Node.js/NestJS backends, WebSocket + Redis real-time layers, and cloud-native AWS deployments. I've also built AI-powered automation using LangChain + LangGraph, cutting content cycles from weeks to minutes.

I own the whole problem, not just a slice of it.

1. May 2025 - Present

   Founding Full-Stack Engineer · CongKong

   Engineered an autonomous AI-driven Content Factory and production RAG verification system, alongside high-performance web applications and system automations.

   • Shipped 5 production-grade real-time platforms as the sole engineer, owning system design, development, scaling, and deployment with zero handoffs.
   • Built QuizPulse, a real-time event platform handling 600 concurrent users, processing submissions in 6.05s with 1.12s average latency using WebSocket synchronization.
   • Engineered LiveVote, scaling Firebase Realtime DB to 900+ CCU by redesigning data sharding strategy, eliminating write contention under peak load.
   • Developed CheckinPulse, an offline-first PWA using IndexedDB and AWS SAM sync workers, ensuring zero data loss under intermittent connectivity.
   • Designed a RAG-backed multi-agent orchestration workflow using Gemini to automate factual validation of generated content.

   • TypeScript
   • Next.js
   • Gemini API
   • Supabase
   • Redis
   • Docker
   • LangGraph
   • n8n
2. Dec 2024 - Mar 2025

   Software Engineer · Aarogya ID

   Contributed to India's National Health Registry (NHPR/HPR) ecosystem by building secure verification services and optimizing backend operations.

   • Built 25+ REST APIs (NestJS) for doctor onboarding and Aadhaar-linked identity verification as part of India's national health infrastructure (NHPR/HPR).
   • Reduced API response time by 40% by eliminating N+1 queries, optimizing serialization, and improving database access patterns.
   • Implemented UHI signing key infrastructure, enabling secure SSO-based authentication across healthcare applications.

   • NestJS
   • TypeScript
   • PostgreSQL
   • Aadhaar API
   • SSO
   • REST APIs
3. Jun - Aug 2024

   App Developer Intern · Messold Technologies

   Designed and implemented campaign data pipelines and multi-account analytics dashboards for high-spend advertising campaigns.

   • Developed a multi-platform analytics dashboard used by 500+ clients to track $1M+ monthly ad spend across Google Ads, Facebook, and Shopify.
   • Automated ingestion of 200+ ad campaigns via OAuth 2.0, reducing manual reporting effort by 8+ hours/week.

   • Node.js
   • Express
   • OAuth2
   • Shopify API
   • MongoDB

• 

  900+ Concurrent Users

  LiveVote: Real-Time Polling Engine

  Highly concurrent, live voting platform designed to handle sudden traffic spikes without dropping database connections. Uses custom distributed counter sharding to process concurrent operations with zero write contention.

  • Node.js
  • Firebase
  • Redis Pub/Sub
  • Next.js
  • TypeScript
• 

  600 CCU · 1.12s Latency

  QuizPulse: Live Interactive Quizzes

  Real-time, multi-room quiz platform utilizing persistent WebSocket channels. Implements Redis-backed state synchronization and event broadcasting for minimal client-side overhead.

  • Firebase
  • TypeScript
  • WebSockets
  • Redis
  • React
• 

  -90% SME Review Time

  CongKong: AI Content Factory

  AI-powered content matching platform coupled with an automated RAG validation workflow. Orchestrates multiple LLM agents to draft, fact-check, and publish SEO-optimized articles, cutting content delivery from 2 weeks to 30 minutes.

  • Next.js
  • Supabase
  • Gemini API
  • n8n
  • TypeScript
• 

  React Native & Spring Boot

  Lost & Found: Campus Mobile App

  Location-aware React Native mobile application backed by a Spring Boot Java API and Supabase database. Integrates JWT rotation, FCM push notifications, geo-radius matching, and Shopify FlashList cell-recycling for 60fps scrolling.

  • React Native
  • Java
  • Spring Boot
  • Supabase
  • TypeScript
• 

  REST API Suite

  QuickDoc: Healthcare REST API Suite

  Spring Boot system facilitating medical appointment scheduling with role-based access controls, automatic email reminders via cron triggers, and Swagger documentation. Zero double-bookings via optimistic locking.

  • Java
  • Spring Boot
  • MySQL
  • Redis
  • Swagger

• Jun 28, 2026

  Systems & AI

  How I Built the CongKong AI Content Factory: Orchestrating LLM Agents and RAG Workflows

  A technical deep dive into building an automated RAG validation workflow and multi-agent LLM orchestration system that cut content review times by 90% in production.

• Aug 29, 2025

  JavaScript

  Node.js vs Bun vs Deno: The Ultimate JavaScript Runtime Comparison

  Should you stick with Node.js, try the new blazing-fast Bun, or give Deno a shot? Software Engineer Kripanshu Singh compares all three JavaScript runtimes on performance, packages, security, and edge deployments.

• Aug 29, 2025

  Package Managers

  npm vs. Yarn vs. pnpm: The Ultimate Package Manager Comparison

  Confused about npm vs. Yarn vs. pnpm? Software Engineer Kripanshu Singh compares all three JavaScript package managers on performance speed, disk usage, workspaces, security, and migration.