Open to new opportunities

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 platforms, database-heavy applications. 1.5+ years building things used by real people, every day.

quosain@dev ~ node server.js
1.5+ yrs experience
3 live systems
8+ databases used

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 stacks. 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. Getting the data model right, designing clean API contracts, understanding where things will break 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 stack · REST API / SaaS
🔷
C# / .NET
Production APIs · Enterprise apps
🐘
PostgreSQL
Complex schemas
🍃
MongoDB
Document models
⚛️
React
Dashboards / SPA
🔐
Auth Systems
JWT · Passport.js · Session management
☁️
Cloud & Deploy
AWS · Render · Railway · Hostinger 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

Where I've shipped real work.

Not side projects that never launched. Production systems used by real people, 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 used in production.
  • Independently scoped, built, and shipped an internal operations tool using Node.js, Express, and MongoDB — sole developer from requirements to deployment.
  • Own backend infrastructure across PostgreSQL, MySQL, SQL Server, and Redis depending on project constraints.
  • Participate in sprint planning and code reviews, assist junior teammates on debugging and architecture decisions.
  • Debug and optimize legacy code, reducing API errors and runtime failures in production environments.
Node.js C# .NET PostgreSQL MongoDB Redis REST APIs AWS
Dec 2023
— Jan 2024
Software Developer Intern
Criterion Tech · Lucknow, India
  • Built automated PDF generation workflows using Python and JavaScript still in use in production.
  • Debugged and improved internal tooling — gained exposure to real-world development processes from day one.
  • Converted to full-time role directly after internship on the basis of performance.
Python JavaScript PDF Automation

Selected work

GitHub →
03 In Dev
MenuQR — SaaS Platform

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

Node.js Express PostgreSQL React Telegram Bot
04 In Dev
Metabolic Facts User Platform

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

Node.js Express MongoDB React
05 Shipped
Internal Ops Tool

Independently designed and delivered an internal business operations tool at Criterion Tech. Sole developer — from requirements gathering and system design through to deployment.

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

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. Let's talk.

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

I bring production experience, an ownership mindset, and the ability to work independently across the full stack. Here's what I offer:

  • Node.js & .NET backend development
  • Complex 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