live demoConcept project
Clinic Booking System
Book a slot in your time zone, race two bookings for one slot, then drag appointments in the admin calendar and watch overlaps fail.
TypeScriptReact.jsNext.jszod
▶ Open demoNode.js Developer — Sami Ullah
Sami Ullah is a Node.js developer who builds REST APIs, integrations and background jobs with Express.js and NestJS. He currently works as a MERN stack developer at Earth Scan Systems, where Node.js serves geospatial and agricultural advisory data to React front ends.
Used professionally since 2025 (1+ years)
What does Sami Ullah do with Node.js?
Node.js is the runtime behind most of my backend work. In my current MERN stack role at Earth Scan Systems I work on the API side that serves map and advisory data to the React front end.
For small services I use Express.js. When an API has many modules, roles and validation rules, I move to NestJS for its structure.
Roles where Node.js is in the job title
- MERN Stack Developer, Earth Scan Systems (2025–present)
- Senior Front-end React/JavaScript Developer, HybridMediaworks (2025–2025)
Official documentation: Node.js documentation
Node.js case studies
live demo
live demoConcept project
Job Queue and Background Workers with NestJS and BullMQ
Enqueue jobs, add or SIGTERM workers, raise the chaos slider and watch retries back off into the dead-letter set.
TypeScriptReact.jsNext.js
▶ Open demo
live demoConcept project
NestJS REST API with Auth, RBAC and Swagger
Sign in as admin, editor or user, call endpoints, untick a permission and watch the same request turn into a 403.
TypeScriptReact.jsNext.js
▶ Open demo
live demoConcept project
URL Shortener with Click Analytics
Shorten a link, claim an alias, follow it and watch the 301, the click count and the referrer chart update live.
TypeScriptReact.jsNext.js
▶ Open demoOwn product
AI Outbound Calling and Lead Qualification System
A system I built that calls a list of consented contacts with an AI voice agent, holds a short qualifying conversation and records every result as a tracked outcome or lead. A NestJS API runs the dialing, compliance checks and webhooks, and a Next.js dashboard with a built-in AI assistant lets the owner run campaigns and ask for reports in plain language.
NestJSTypeScriptPrismaSQLite
Own product
Salon Booking Marketplace — Multi-Salon Platform
A multi-salon booking marketplace I designed and built for Pakistan. Clients find nearby salons on a map, choose a barber, service and time, and book at the salon or as a home visit. Salons run staff, schedules and earnings from their own dashboard, and the platform collects a commission per completed booking through daily settlements.
Next.jsReact.jsTypeScriptTailwind CSS
live demoConcept project
File Upload and Image Processing Service in Node.js
Drop a file, pause and resume a chunked upload, and see a renamed .exe and a 12 MB zip get refused.
TypeScriptReact.jsNext.jsWeb Crypto API
▶ Open demo
live demoConcept project
GraphQL API with NestJS
Write GraphQL queries and mutations, then compare the SQL count with and without DataLoader batching.
TypeScriptReact.jsNext.jsGraphQL
▶ Open demo
live demoConcept project
Inventory Management System
Oversell a product, run a transfer that fails halfway and rolls back, receive a purchase order and export the low-stock list.
TypeScriptReact.jsNext.jszod
▶ Open demo
live demoConcept project
Invoice and PDF Generator API
Build an invoice, watch exact totals update, double-submit it to test idempotency, then save it as a PDF.
TypeScriptReact.jsNext.js
▶ Open demo
live demoConcept project
Multi-tenant SaaS Backend with NestJS and PostgreSQL
Switch tenants, request another company's data, spoof a tenant header and hit a plan limit, all with the SQL shown.
TypeScriptReact.jsNext.js
▶ Open demo
live demoConcept project
Webhook Relay and Event Logger
Fire signed webhooks, tamper with one, resend a duplicate and watch a flaky destination retry on a schedule.
TypeScriptReact.jsNext.jsWeb Crypto API
▶ Open demoOwn product
ReviewLens — Review and Returns Analysis for Stores
ReviewLens (working name) is a SaaS I built for online stores. It reads a store's customer reviews, returns and competitors and turns them into a short report: what customers complain about, which products cause the most problems and what to fix first. All numbers are computed in code, and AI only classifies text and explains the results.
Next.jsReact.jsTypeScriptTailwind CSS
Own product
SimRelay — Android SMS Gateway Using Your Own SIM
SimRelay is a small Android app I built that turns my own phone into an SMS gateway. It checks a web server for pending messages, sends each one as a normal text from the phone's SIM card, and reports the sent and delivered status back, so a small web app can send booking confirmations without a paid SMS provider.
KotlinJetpack ComposeMaterial 3Kotlin Coroutines
Articles about Node.js
#nestjs6 min
API Versioning in NestJS: URI, Header and Media Type
A practical guide to API versioning in NestJS 11: URI, header and media type strategies, version-neutral routes, deprecation headers and when to bump.
read →
#postgresql6 min
Prevent Double Booking in PostgreSQL with Constraints
How to prevent double booking in PostgreSQL: a booking schema with tstzrange, a btree_gist exclusion constraint, and clean 23P01 handling in NestJS.
read →
#postgresql6 min
PostGIS for Web Developers: A Practical Intro
A PostGIS introduction for web developers: geography vs geometry, nearby search with ST_DWithin, GiST spatial indexes, and GeoJSON output for Leaflet maps.
read →
#nestjs6 min
NestJS JWT Refresh Tokens: Rotation and Cookies
How to build NestJS JWT refresh tokens properly: short-lived access tokens, rotated refresh tokens stored as hashes, httpOnly cookies and reuse detection.
read →
Frequently asked questions
What does Sami Ullah build with Node.js?
Sami Ullah builds REST APIs, third-party integrations, file handling and background job workers with Node.js. He uses Express.js for small services and NestJS for larger APIs with authentication, role-based access and validation, typically storing data in PostgreSQL or MySQL.
Express or NestJS: which does Sami Ullah recommend?
Express.js suits small services with a handful of routes, where its minimal API keeps code short. NestJS suits APIs that will grow, because modules, dependency injection, guards and pipes give every feature the same shape. For a team project expected to last years, he usually recommends NestJS.
Is Sami Ullah available for Node.js backend work remotely?
Yes. Sami Ullah works remotely from Sargodha, Pakistan, and has worked remotely for a London-based company before. Backend work can be scoped as a standalone API or as part of a full stack build with a React or Next.js front end. Use the contact form on this site to start.