Yaduraj Singh — Full-stack engineer · AI/ML builder

Ships production-grade systems solo — firmware on ESP32, scalable SaaS, iOS apps. Three live products with real users before 21.

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

Highlights

• 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.

By the numbers

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

Now 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.

• Point one base_url at Tollgate — OpenAI, Anthropic, xAI, OpenRouter, Gemini, and more. No SDK rewrite.
• Per-feature (tag) spend visibility, exact-match prompt caching, and hard budgets.
• Runaway-agent alerts & guards — stop burn before another overnight surprise bill.

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

Projects

Aarogya Setu

Multi-tenant hospital SaaS — OPD/IPD queues, EMR, appointments, billing, pharmacy, diagnostics. 6-tier RBAC.

Category: SaaS · Self-hosted. Stack: Next.js 14, TypeScript, Prisma, PostgreSQL, Redis, Docker. Live at https://arogya.yaduraj.me.

MuhDikhai

Omegle-style anonymous video chat. Full WebRTC peer lifecycle built manually over Socket.io. Sub-2s pairing.

Category: Real-time · WebRTC. Stack: Node.js, TypeScript, WebRTC, Socket.io, PostgreSQL. Live at https://batchit.yaduraj.me.

CineVerse

Social film tracking — watchlists, ratings, reviews, discovery feeds. TMDB API across 500k+ titles.

Category: Social · SSR. Stack: Next.js, Firebase, TMDB API, Nginx, PM2. Live at https://cine.yaduraj.me.

SecondMind / CortX

Cognitive OS on ESP32-S3 Sense. Voice → faster-whisper → local LLM → Coqui TTS. VAD firmware, Opus compression.

Category: Hackathon Winner. Stack: ESP32-S3, FastAPI, Flutter, Neo4j, Qdrant. Live at https://cortx.yaduraj.me.

GBU Timetable

Official iOS app for GBU students. Live home-screen widgets via WidgetKit. Real-time schedule updates.

Category: iOS · App Store. Stack: SwiftUI, Combine, WidgetKit. Live at https://apps.apple.com.

Maakosh

Maternal & neonatal health iOS app. Wearable sensor integration (MAX30100, EMG) for real-time vitals. Role-based.

Category: Hackathon Winner. Stack: Swift, Firebase, ThingSpeak.

Bolonyay

Multilingual legal aid iOS app — petitioners with regional advocates. Voice-assisted forms, automated PDF reports.

Category: iOS · Legal Aid. Stack: Swift, Firestore, PDFKit, STT.

Stack

• Full-stack web: Next.js 14, React 18, TypeScript, Node.js, Express, tRPC, Tailwind, shadcn/ui
• Mobile / iOS: Swift, SwiftUI, UIKit, Combine, WidgetKit, AVFoundation, Flutter, Dart
• Real-time & networking: WebRTC, Socket.io, REST, GraphQL, Cloudflare Tunnels
• AI / ML: faster-whisper, LM Studio, Coqui TTS, Qdrant, Neo4j, Celery/Redis, xlm-roberta, spaCy, Ollama
• Embedded / hardware: ESP32-S3, FreeRTOS, I2S, BLE, Opus, PSRAM, C/C++
• Databases: PostgreSQL, Prisma, Firebase, Redis, MongoDB, MySQL
• DevOps / infra: Docker, Compose, GitHub Actions, Nginx, PM2, Certbot, systemd, Vercel, SSH

Contact

• Email: yadurajsingham@gmail.com
• GitHub: https://github.com/YadurajManu
• LinkedIn: https://www.linkedin.com/in/yadurajenc
• Résumé: https://www.yaduraj.me/Resume_Web.pdf

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