# About Yaduraj Singh

Yaduraj Singh is a 20-year-old full-stack engineer · ai/ml builder based in Dehradun · Greater Noida, India. He builds and operates production software end to end — from firmware running on microcontrollers to multi-tenant SaaS platforms serving real users — and runs the infrastructure underneath it himself.

## What that means in practice

- Self-hosted Linux infrastructure — Nginx, SSL, PM2, systemd. Not just Vercel deploys.
- Manual WebRTC: full ICE/STUN/TURN + signalling layer. No third-party video SDK.
- Designed multi-tenancy, RBAC, caching, CI/CD for a hospital SaaS — solo, from a blank repo.
- Three live production applications with real users before age 21.
- Hackathon-winning hardware + AI system: ESP32-S3 + FastAPI + Flutter, team of two.
- AI/ML pipelines: handwriting synthesis, voice + LLM + TTS cognitive OS, wearable vitals monitoring.

## Track record

- **2,000+** users in production
- **08** shipped projects
- **03** hackathons won
- **04** self-hosted servers

## Experience

### Lead Software Developer — Intern — Gautam Buddha University

2024 · 6 months

- Sole architect of a ground-up institutional ERP — ER diagrams, API contracts, to production deployment.
- Modules: student lifecycle, automated attendance, fee ledger, timetable engine, faculty/admin portals.
- Eliminated 100% paper workflows. ~60% admin overhead reduction.

Stack: Node.js, Express, JWT RBAC, React

## Currently building

**Tollgate** (private beta) — Cost & usage observability for LLM APIs. Reverse proxy for OpenAI, Anthropic, and OpenAI-compatible providers — one base URL for per-feature cost, exact-match caching, budgets, and runaway-agent alerts.

## Selected work

- **Aarogya Setu** — Multi-tenant hospital SaaS — OPD/IPD queues, EMR, appointments, billing, pharmacy, diagnostics. 6-tier RBAC. _(Next.js 14, TypeScript, Prisma, PostgreSQL, Redis, Docker)_
- **MuhDikhai** — Omegle-style anonymous video chat. Full WebRTC peer lifecycle built manually over Socket.io. Sub-2s pairing. _(Node.js, TypeScript, WebRTC, Socket.io, PostgreSQL)_
- **CineVerse** — Social film tracking — watchlists, ratings, reviews, discovery feeds. TMDB API across 500k+ titles. _(Next.js, Firebase, TMDB API, Nginx, PM2)_
- **SecondMind / CortX** — Cognitive OS on ESP32-S3 Sense. Voice → faster-whisper → local LLM → Coqui TTS. VAD firmware, Opus compression. _(ESP32-S3, FastAPI, Flutter, Neo4j, Qdrant)_
- **GBU Timetable** — Official iOS app for GBU students. Live home-screen widgets via WidgetKit. Real-time schedule updates. _(SwiftUI, Combine, WidgetKit)_
- **Maakosh** — Maternal & neonatal health iOS app. Wearable sensor integration (MAX30100, EMG) for real-time vitals. Role-based. _(Swift, Firebase, ThingSpeak)_
- **Bolonyay** — Multilingual legal aid iOS app — petitioners with regional advocates. Voice-assisted forms, automated PDF reports. _(Swift, Firestore, PDFKit, STT)_

## Get in touch

Email [yadurajsingham@gmail.com](mailto:yadurajsingham@gmail.com), or see the [contact page](/contact) for every channel. Machine-readable versions of everything on this page are available from the [public API](/docs).