Gagandeep Bhatia

Founding Backend Engineer. npm Author. Fantasy Writer.

Building systems that serve 10M+ users, open-source tools developers actually use, and a dark fantasy novel.

10M+Users Served
6npm Packages
7Chapters Published
Explore My WorkGet in TouchDownload Resume

Featured Work

What I'm most proud of

Dev Tools

Free browser-based utilities and interactive demos

Projects

Open-source npm packages and applications

Stone Age Board Game Online

A real-time multiplayer implementation of the Stone Age board game for 2-4 players. Features worker placement, resource gathering, building, and tool crafting with WebSocket-powered gameplay. Free to play in the browser.

TypeScriptReactNode.jsWebSockets
Live

@gagandeep023/expose-tunnel

A self-hosted tunnel service (ngrok alternative) that exposes local servers to the internet via custom subdomains. WebSocket relay server on EC2, wildcard DNS, CLI and programmatic API, published as an npm package.

TypeScriptNode.jsWebSocketsNginx
GitHubnpm

CryptoArbitrage

A cryptocurrency arbitrage detection system that monitors price discrepancies across multiple exchanges in real-time, identifying profitable trading opportunities through automated analysis.

JavaScriptNode.jsAPIs
GitHub

Nano Arbitrage

A lightweight, high-frequency arbitrage bot built for speed. Designed to detect and capitalize on micro price differences across crypto trading pairs with minimal latency.

JavaScriptNode.js
GitHub

PurpleMaze

An interactive web application featuring maze generation and solving algorithms with visual pathfinding, exploring graph traversal, DFS, BFS, and A* in a gamified experience.

JavaScriptHTMLCSS
GitHub

Gagan Blue DocuSign

A document signing and management platform with e-signature workflows, built to streamline digital document authentication and approval processes.

JavaScriptNode.jsAPIs
GitHub

Video Platform

A full-stack video streaming and sharing platform with upload, playback, and content management features. Built to understand video processing pipelines and streaming architecture.

JavaScriptNode.jsHTML
GitHub

FaangMock

An interview preparation platform (beta) providing mock interview experiences, curated questions, and practice tools designed to help engineers prepare for top tech company interviews.

HTMLCSSJavaScript
GitHub

@gagandeep023/api-gateway

Type-safe Express API gateway with IP-based rate limiting (Token Bucket, Sliding Window, Fixed Window), API key auth, IP filtering, and a real-time React analytics dashboard.

TypeScriptNode.jsExpressReact
GitHubLivenpm

Real-Time Collaborative Editor

A WebSocket-based collaborative text editor with Operational Transform for conflict resolution, live cursor presence, and room management. Multiple users edit simultaneously with zero database dependencies.

TypeScriptNode.jsWebSocketsReact
Live

@gagandeep023/log-analyzer

A zero-dependency CLI and library for analyzing JSONL log files. Computes latency percentiles, detects error spikes, latency outliers, and repeated patterns, then generates Markdown and JSON reports.

TypeScriptnpmVitestCLI
GitHubLivenpm

@gagandeep023/json-view

An npm package and interactive tool for formatting, diffing, and un-stringifying JSON. Zero dependencies, runs entirely client-side with no data sent to any server.

TypeScriptnpmReactVitest
GitHubLivenpm
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Creative

Writing, stories, and ideas

Blog

Building an API Gateway & Rate Limiter from Scratch in Node.js

How I implemented three rate limiting algorithms, an API key system, and a real-time analytics dashboard, all without a database.

Blog

Building a Real-Time Collaborative Editor with Operational Transform in Node.js

How I implemented Operational Transform from scratch to build a Google Docs-style collaborative editor with WebSockets and zero database dependencies.

Blog

Building a JSON Tools Package from Scratch in TypeScript

How I built a zero-dependency npm package for JSON formatting, recursive diffing, and un-stringifying nested JSON, then integrated it as a client-side tool in my portfolio.

Book

RedMarch: The Awakening War

A dark epic fantasy of conquest, prophecy, and power. Read free online.

All blog posts →

Games & Interactive

Multiplayer experiences built from scratch

About Me

Founding Backend Engineer at Pulse Energy. Building systems that serve 10M+ users at 99.9% uptime and 60ms latency. npm package author, fantasy writer, and open-source contributor.

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