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Zain Haroon

Zain Haroon

Full-stack Engineer — Lahore, Pakistan.

Now

Jan 2024 — Present

MERN Stack Developer ENXSYS

Agency-side delivery across several client products — moving between front-end builds and full-stack work, on the MERN side and in Python alongside it.

  • Mani — AI work and document platform: built the modular React/TypeScript front end for a Drive-like workspace, with drag-and-drop ordering of mixed blocks (text, images, video, nested folders), OpenAI-powered summarisation, and contextual chat over organisational data
  • SmashDeck — marketing automation: integrated Brevo for email campaigns and Twilio for programmatic SMS and in-app calling, including answering-machine detection, on a React/Express stack with AWS S3, SQL and the Google Admin API
  • Browser automation and analytics: designed and maintained a Python framework (Selenium, later Playwright) automating authenticated Google sessions across a pool of managed browser profiles — proxy rotation with cooldown and circuit-breaking, ASN diversity enforcement, and an analytics layer tracking session health and challenge rates
  • Adlarion — ad performance analytics: dashboards over the Google Ads and Meta Ads APIs, with OAuth 2.0 authentication and multi-account campaign management
  • Also shipped Chorus Wellness (sleep-health marketing site, dashboard front end and blog), Rooftops (climate monitoring and subscriptions, Next.js/SQL) and HR-Talkers (Next.js discussion forum)
  • Delivery: deployed Node services to AWS EC2 over SSH and PM2, and helped stand up GitLab CI/CD to shorten release cycles
  • Internal enablement: ran engineering workshops on LLM fundamentals, tool calling and RAG, and benchmarked hosted vs. local inference across providers to guide cost decisions

Building since

3 yrs 10 mos

professionally, since Nov 2022

  1. ENXSYS

    2 yrs 8 mos

    Jan 2024 — Present

  2. SAPPHIRE — Diamond Fabrics

    1 yr 2 mos

    Nov 2022 — Jan 2024

Roles
2
Shipped with
15

Before

Nov 2022 — Jan 2024

Full-stack Engineer SAPPHIRE — Diamond Fabrics

Sapphire is one of Pakistan's largest textile manufacturers, operating across Denim, Finishing, Retail, Spinning and Dairy. I built internal web platforms for the Denim division — the Invoice Portal and DCRM.

  • Built the Supplier Invoice Portal (Next.js + NestJS), letting suppliers submit purchase invoices directly into the system
  • Built DCRM , a customer-relations platform for the Denim division with SAP integrations
  • Fanned SAP data out past the licensed-seat limit — DCRM put ERP data in the browser and on phones for staff who had no SAP seat of their own
  • Owned both portals across the stack, from the React/Next.js clients to the Express/NestJS APIs on SAP HANA

Education

  • 2018 — 2022

    BS Computer Science

    COMSATS University Lahore

    Programming was always my favourite subject. COMSATS is where the habits came from — time management, stress management, punctuality.

  • 2016 — 2018

    ICS — Physics

    Punjab College (Shalamar Campus)

  • 2014 — 2016

    Matriculation

    Don Bosco High School

Stack · 47

Languages
TypeScript JavaScript (ES6+) Python SQL
Frontend
React Next.js TanStack (Start / Router / Query) Astro Tailwind CSS shadcn/ui MUI Redux Zustand SCSS
Backend
NestJS Node.js Express REST APIs Better Auth Server-side rendering
Data
PostgreSQL (Neon) MySQL / MariaDB SAP HANA MongoDB Drizzle ORM Schema & query design
AI / LLM
OpenRouter OpenAI API Ollama Tool calling Context management Prompt-injection hardening RAG
Automation
Selenium Playwright Proxy rotation n8n Xano
Cloud & Tools
Vercel AWS (EC2, S3) Docker PM2 Git GitHub GitLab CI/CD Postman Biome

No percentages, no bars, no star ratings — a self-assessed “87%” is a number nobody can defend. The evidence is on the work.

Reach me

Lahore, Pakistan Open to remote