Amitesh Kumar

also known as Bhanu Stark

Full-stack · Product · Infrastructure

I ship full-stack products that survive real scale.

At 4 Way Technologies I hardened Spicychat for 3 million users — sliding-window rate limits, personalized AI push, AI+human moderation, and TTS over WebSockets for 600k premium users. I built The Kirana Point end-to-end — one API for POS, customer, and delivery — now running two marts. Public, my social super-app, has 100,000+ Play Store downloads.

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  • 3M Users on Spicychat
  • 100k+ Play Store downloads
  • 600k Premium TTS users
  • 2 Live marts on one platform

Range

Frontend, backend, infrastructure.

Not a stack list — the work those layers actually had to do.

01

Frontend

React, Next.js, Redux, React Native / Expo / Capacitor, Electron POS, and Jetpack Compose. Barcode checkout on the desktop, location-based grocery on mobile, and a social feed that still feels instant.

  • React
  • Next.js
  • React Native
  • Electron
  • Jetpack Compose

02

Backend

Node/Express and Bun/Elysia. JWT + store-level RBAC, Socket.IO with a Redis adapter, and AI pipelines — moderation, unique push, TTS, tool-calling agents. One API serving admin, POS, customer, and delivery.

  • Node.js
  • Express
  • Bun / Elysia
  • JWT / RBAC
  • AI pipelines

03

Infrastructure

AWS (Lambda, S3, CloudFront, CloudWatch, EC2), Cloudflare, Redis / Momento, Docker, GitHub Actions and GitLab CI. Sliding-window rate limits designed for 3 million users — a foundation that grows without a rewrite.

  • AWS
  • Cloudflare
  • Redis
  • Docker
  • CI / CD

Selected work

Case studies with numbers.

Scale at Spicychat, a grocery OS in production, and a social super-app on the Play Store.

All projects

Stack

Tools that have shipped.

Languages, frontend, APIs, mobile, data, cloud, and AI — used in production, not collected.

Languages

  • TypeScript
  • JavaScript
  • Kotlin
  • HTML / CSS
  • Bash

Frontend

  • React
  • Next.js
  • Redux
  • HeroUI
  • Tailwind CSS
  • PWA

Backend

  • Node.js
  • Express
  • Bun
  • Elysia
  • JWT
  • BullMQ

Mobile & desktop

  • React Native
  • Expo
  • Capacitor
  • Electron
  • Jetpack Compose

Data & realtime

  • MongoDB
  • DynamoDB
  • Redis
  • WebSocket
  • Socket.IO
  • Algolia
  • TypeSense
  • Momento

Cloud & DevOps

  • AWS Lambda
  • EC2
  • S3
  • CloudFront
  • Cloudflare
  • Docker
  • GitHub Actions
  • GitLab CI

AI

  • OpenRouter
  • Fal.ai
  • Ollama
  • Transformers.js
  • Tool-calling agents

Education

Computer applications, twice.

  1. 2022–2024

    Master of Computer Applications (MCA)

    Galgotias University

  2. 2015–2018

    Bachelor of Computer Applications (BCA)

    Veer Kunwar Singh University, Ara

Writing

Notes from production.

AI character platforms, rate limits at millions of users, and products that are actually live.

Visit the blog

Amitesh Kumar

Full-stack. Product. Infrastructure.

Open to full-time product and platform roles.

I write about AI character platforms, production systems, and shipping grocery and social products.

Let’s talk Writing