Open to new roles

Full-Stack
Engineer
& Builder

Syed Quosain Hasan · Lucknow, India

I architect and ship backend systems that handle real production load — REST APIs, multi-tenant SaaS, database-heavy apps. 1.5+ years of building things used by real people, every day.

quosain@dev — node server.js
1.5+ yrs production
3 live systems
8+ databases
About

I build backends that last — not demos that ship once.

I'm a full-stack developer with a backend-first mindset. My work lives in production — APIs handling real traffic, databases with careful schema design, systems other developers depend on.

At Criterion Tech, I own features end-to-end across C# .NET and Node.js. Separately I'm building MenuQR — a multi-tenant restaurant SaaS with a 31-table PostgreSQL schema and Telegram bot integrations.

I think about architecture before syntax. Data models, API contracts, failure points under load — that's the work I find interesting.

🎓
MCA — Master of Computer Applications
Currently pursuing · SGPA 8.73 Sem 1
🎓
Liberal Education — Computer Science
Era University, Lucknow · 2021–2024
Core Stack
Node.js + Express
Primary · REST API / SaaS
🔷
C# / .NET
Production APIs · Enterprise
🐘
PostgreSQL
Complex schemas
🍃
MongoDB
Document models
⚛️
React
Dashboards / SPA
🔐
Auth Systems
JWT · Passport.js · Sessions
☁️
Cloud & Deploy
AWS · Render · Railway · VPS
Redis
Caching · Queues
🕸️
WebSockets
Real-time apps
🐍
Python
Automation scripts
Also experienced with
MySQL SQL Server MariaDB GoJS Telegram Bot API PWA Web Scraping Git Linux PDF Automation
Experience

Where I've shipped real work.

Not side projects that never launched — production systems with real users, maintained over months, with real consequences when things break.

Current
Sep 2024
— Present
Junior Software Developer
Criterion Tech · Lucknow, India
  • Build and maintain RESTful APIs in C# .NET and Node.js powering live mobile apps and web platforms in production.
  • Independently scoped, built, and shipped an internal operations tool — sole developer from requirements to deployment.
  • Own backend infrastructure across PostgreSQL, MySQL, SQL Server, and Redis based on project constraints.
  • Participate in sprint planning and code reviews; assist teammates on debugging and architecture decisions.
  • Debug and optimize legacy code, reducing API errors and runtime failures in production.
Node.jsC# .NET PostgreSQLMongoDB RedisAWS
Dec 2023
— Jan 2024
Software Developer Intern
Criterion Tech · Lucknow, India
  • Built automated PDF generation workflows in Python and JavaScript still in use in production.
  • Debugged and improved internal tooling from day one of real-world exposure.
  • Converted to full-time directly after internship on the basis of performance.
PythonJavaScript PDF Automation
Projects

Selected work

GitHub →
03 In Dev
MenuQR — SaaS Platform

QR-code digital menu SaaS for restaurants. Multi-tenant architecture with a 31-table PostgreSQL schema, Telegram bot staff management via invite codes, and a React owner dashboard.

Node.jsExpress PostgreSQLReactTelegram Bot
04 In Dev
Metabolic Facts User Platform

Consumer-facing app extending the Metabolic Facts research ecosystem. Node.js backend, MongoDB data models, React frontend designed for non-specialist audiences.

Node.jsExpress MongoDBReact
05 Shipped
Internal Ops Tool

Independently scoped, designed, and delivered a business operations tool at Criterion Tech. Sole developer — from requirements through deployment.

Node.jsExpressMongoDB
"The backend isn't the invisible part of the product —
it's the foundation everything else stands on."
Syed Quosain Hasan · Full-Stack Engineer
Contact

Let's work together.

I'm actively looking for my next role — ideally a backend or full-stack position where the work is technically challenging and the team cares about craft.

Actively looking · Available now
Looking for a Backend or Full-Stack Role

Production experience, ownership mindset, full-stack capability. Here's what I bring:

  • Node.js & .NET backend development
  • PostgreSQL & MongoDB schema design
  • REST API architecture from scratch
  • Multi-tenant SaaS platform experience
  • AWS deployment & cloud infrastructure
  • Sprint workflows, code reviews, team collaboration
Send me a message