Full Stack Developer × Growth Engineer

Mahabub Hossain | Full Stack Developer & Growth Engineer

React · Next.js · Node.js · Python · Flutter: 10+ years shipping production web, mobile apps and AI automations. I also build the growth engine: server-side tracking, attribution and CRO that recovered 35% of lost conversions. Based in Rome, open to remote (EU / Global).

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Mahabub Hossain — Full Stack Developer & Growth Engineer based in Rome

Next.js 16TypeScriptNode.jsMeta CAPI v19Python

About Me

I'm a Full Stack Developer & Growth Engineer with 10+ years of experience. I currently work at KRÜGER VP, where I architected the migration of the GlobalNation TV platform to Next.js 15 and a Node.js/Express API service on AWS. My background is unusual for a developer: I hold an MSc in Marketing & Digital Communication and a BBA in Management Information Systems, so I don't just ship features, I instrument them. I built the WebyZoo Tracking & Analytics engine: hybrid server-side conversion tracking (Meta CAPI, GA4, TikTok, LinkedIn) that lifted Event Match Quality to 9.4/10 and cut acquisition costs by 22%. I build iOS/Android apps with Flutter and React Native, AI automations in Python and n8n, and I develop with AI coding tools for speed without sacrificing quality. Based in Rome, Italy, open to remote roles across the EU and globally.

Dual Background (Tech + Marketing)

Event Match Quality: 9.4/10

Next.js 15/16 Architect

Technical Stack & Core Disciplines

Modular expertise across modern web engineering, data pipelines, and conversion architecture.

Frontend

TypeScriptJavaScriptReactNext.js (App Router)Tailwind CSSHTML5CSS3/SASS

Mobile

FlutterReact NativeCross-platform iOS/Android

Backend & Data

Node.jsExpressDjangoREST APIsPrisma ORMMySQLPostgreSQL

AI & Automation

Pythonn8n workflow automationAI-assisted development (vibe coding)LLM API integrations

MarTech & Analytics

Meta Conversions APIGA4 Measurement ProtocolTikTok / LinkedIn Events APIsserver-side trackingConsent Mode v2attribution modelingEMQ optimization

DevOps

DockerDocker ComposeAWS EC2NginxGit/GitHub

Featured Case Study

WebyZoo — My Agency

WebyZoo MarTech Engine: Hybrid Server-Side CAPI & Conversion Attribution

How I recovered 35% of dark conversion signals and boosted Meta EMQ to 9.4/10 with an enterprise client/server tracking infrastructure.

9.4/10

Meta EMQ

+35%

Recovered conversions

Double-attribution error

400-day

Safari cookie retention

-22%

Blended CAC

Engineered an enterprise-grade hybrid conversion tracking system combining client-side DataLayer events with server-side Meta Conversions API (CAPI), GA4 Measurement Protocol, and TikTok Events API. Solved iOS 14.5+ attribution loss, eliminated double-counting via 17-digit deterministic deduplication, and protected $40k+ in monthly ad spend through a novel Cash on Delivery two-phase verification pipeline.

1. Zero-Drop Dual Dispatch

Simultaneous client pixel and server-side execution guaranteeing no event loss.

2. Deterministic Deduplication

17-digit synchronized IDs guaranteeing zero double-attribution across platforms.

3. Safari ITP Resilience

Server-set HttpOnly first-party cookies with 400-day attribution windows.

4. Ad-Blocker Stealth Proxy

First-party reverse proxy routing preventing ad-blocker signal dropping.

5. COD Ad Spend Firewall

Withholds purchase signals until courier-confirmed delivery, filtering fake orders.

6. Regulatory Compliance

Google Consent Mode v2, DMA and GDPR ready privacy handling.

System Architecture Flow

Latency: <45ms

Client Browser / DataLayerEvent Initialization

First-Party Cloud ProxyReverse proxy & CNAME

Verification PipelineDeduplication & COD check

Meta CAPI / GA4 / TikTokDeterministic Dispatch

Next.jsTypeScriptMeta Graph API v19GA4 Measurement ProtocolTikTok Events APILinkedIn CAPIPrismaSQLite/PostgreSQL

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Experience & Track Record

Over a decade driving full-stack engineering and quantitative growth architectures.

Full Stack Web Developer (Remote) · KRÜGER VP | Visual Production

Sep 2024 – Present

GlobalNation / GNTV Platform · Rome / Berlin

Architected end-to-end migration off Payload CMS to an internal Next.js 15 App Router admin portal + Node.js/Express Prisma API service.
Branch-scoped MySQL databases and isolated deploy environments (alpha, staging, beta, production) on AWS EC2 with Docker Compose.
Block-based page editor (Lexical), custom navigation menus, media management on Bunny.net CDN.

Founder & Growth Engineer · WebyZoo (my agency)

2025 – Present

E-Commerce Tracking Architecture · Remote

Built a hybrid server-side tracking engine (Meta CAPI v19, GA4 Measurement Protocol, TikTok/LinkedIn Events APIs) with deterministic 17-digit event deduplication.
Lifted Meta Event Match Quality from 4.5 to 9.4/10; recovered +35% of lost conversions; -22% blended CAC.
Two-phase COD verification pipeline holding ad signals until courier delivery to cut wasted ad spend on fake orders.
Server-side 400-day first-party cookies defeating Safari ITP limits; Consent Mode v2 / DMA compliant.

Freelance Web Developer · Upwork

Nov 2015 – Present

Global Client Engagements · Remote

Full-stack web apps, e-commerce and headless CMS integrations (Next.js, React, Node.js, WordPress) for international clients.

Web Developer (Remote) · 2Marketing

Feb 2020 – Apr 2021

Performance Web Builds · Remote

Figma → high-performance pages with Gatsby, React, GraphQL; technical SEO.

Education & Languages

MSc Marketing & Digital Communication

LUMSA University, Rome (2022–2026)

BBA Management Information Systems

Independent University, Bangladesh (2014–2020)

Languages:

Bengali (Native)English (Professional)Italian (A2)

Selected Projects

High-performance production apps, tracking SDKs, and automated backend infrastructure.

Featured

GlobalNation TV Content Platform

Full-stack enterprise media and creator management platform built with Next.js 15 App Router, Node.js/Express, dual-database Prisma ORM, a custom block-based headless CMS (migrated off Payload CMS), and multi-environment Docker deployments on AWS EC2.

93 page routes + 93 API handlers

5 isolated deploy environments

312 React components (80 design-system)

Zero-downtime CMS migration

Next.js 15React 19TypeScriptNode.jsExpressPrisma ORMMySQLDockerAWS EC2Tailwind CSS v4Bunny.net CDNZoho APIStripeLiveKit

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