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Full-stack Web developer with more than 9 years of experience. My main specialization is tending for Wordpress and WooCommerce-based websites: coding custom functions and features, implementing Figma designs, website maintenance, writing specialized Wordpress plugins. For Woocommerce, I've implemented custom discounts, subscription tiers, loyalty programs, customized checkout pages & shipping rates, imported/exported products data, managed product translation for multilingual web stores. And, of course, various product filters, search forms, custom product sorting. I have experience with multilingual Wordrpess websites - mainly based on WPML, but also a bit of Loco Translate and TranslatePress. Among page builders I am most familiar with Elementor, and had briefly worked with WPBakery and Thrive Architect. I've also have a bit of experience with MVC-based frameworks (Laravel, Symfony), modern JS libraries (React & Preact), and creating website designs based on Figma/PDF. Had to set integrations with Klaviyo, Mailchimp, Stripe, Paypal, third-party licensing services. In conclusion, I'm well-versed in writing any form of PHP code - from web scraping scripts to custom Elementor widgets. I've coded for my clients tools that are able to generate PDF file, or read Google Spreadsheet document, or run a sophisticated search in a custom database. Can manage Unix-based servers and familiar with cPanel, Plesk. Can run site migrations (change domain name or hosting provider). Deeply familiar with MySQL databases - backups, migrations, DB optimization, custom tables and SQL queries. Proficient with Git and shell scripting.

Engineering Solutions for Complex Technical Challenges I build software with a rigorous engineering mindset, prioritizing architecture, security, and high performance. My expertise bridges the gap between low-level system programming and modern scalable web ecosystems. Systems & Performance I specialize in high-performance C/C++ applications, managing multi-threaded architectures (POSIX) where memory optimization is critical. From custom logic parsers to desktop tools in Electron, I deliver clean, industrial-grade code. SaaS & Full-Stack I engineer Python/Flask platforms with complex business requirements, including full Stripe API integrations for subscription lifecycles. I ensure every layer (from relational databases to session security) is robust and production-ready. My Approach I thrive on non-trivial problems, whether architecting a network protocol or a cloud-based media engine. I don't just write code; I design systems that meet professional standards. Let’s connect to discuss how I can bring technical excellence to your next project.

I am an expert Mobile developer and FullStack programmer. I have experience working on Flutter or Appcelerator Studio to create application also for Android and iOs and create Backend infrastructure with different platforms and languages such as PHP, GoLang, Coldfusion using or not relative frameworks to dialogue with Sql Database or Firebase Database

React Native & Laravel developer with 13+ years building AI-integrated apps, mobile solutions, and secure backend systems for startups and enterprises. Worked with teams at Google, Facebook, and eBay across Finance, Blockchain, Energy, and Telecom. 100% Job Success | Expert-Vetted | Oxford MSc Cyber Security. 📱 MOBILE APP DEVELOPMENT - React Native (iOS & Android), Native iOS, Native Android - Cross-platform apps, app architecture, App Store & Play Store deployment - Push notifications, offline sync, third-party API integration 🤖 AI INTEGRATION - Integrating AI into existing apps — chatbots, GPT & LLM features - Predictive analytics, AI-powered mobile & web apps - OpenAI, Claude, and other LLM API integration ⚙️ BACKEND & FULL-STACK - Laravel, PHP, Node.js, REST API & GraphQL - supabase - Vue.js, React.js, full-stack web applications - AWS, VPS, server architecture, CI/CD, Docker 🔐 SECURITY - Penetration testing (OWASP Top 10), vulnerability assessments - AI Agent security Audit - LLM Security Audit - Web app & API security, security architecture - Smart contract audits, threat modeling ✅ 100% Job Success Score — Expert-Vetted by Upwork ✅ 57 completed projects | 5.0 rating (40+ reviews) ✅ Oxford MSc Cyber Security + Politecnico di Torino BEng (2013) ✅ Avg. response under 4 hours | Available now "Exceptional talent. Collaborated 3+ years. Highly recommended." "Professional, quick, communicative — a pleasure to work with." "Very professional, fast and competent. Highly recommend."

I have work experience as a software developer with a focus on backend development. I build algorithmic trading systems, data pipelines, automation tools, low-latency components, REST APIs, and anything that sits between raw data and a usable result. Languages: C++, C#/.NET, Python, Java, HTML/JS. I write C extensions in Python when performance matters and CPython overhead doesn't cut it. I have created scripts for platforms like MetaTrader, cTrader, Interactive Brokers, and NinjaTrader, including Expert Advisors and custom indicators, but my experience extends well beyond finance into general software engineering. I also have experience building AI and machine learning systems, including predictive models and reinforcement learning agents that learn through interaction with custom-built environments. My workflow covers the full pipeline: environment design and data collection, model training, and production deployment. I have also worked with large language models, specifically for chatbot development using RAG pipelines and fine-tuning techniques. I use Docker for containerized and reproducible environments and Git for version control across experiments and team collaboration.

“Hamza did an excellent job writing the needed Stripe webhook.” “Direct, honest, articulate, skilled, and highly responsive.” “Very fast, diligent, and responsive. Would strongly recommend.” I build production grade AI integrations and automation systems for startups and product teams that need results. If you are looking to integrate GPT, LLMs, AI agents, or automation workflows into a real product with real users, I am the engineer you hire when reliability, scalability, and clean infrastructure matter. I specialize in taking AI from concept to live, revenue-generating systems: APIs, chatbots, assistants, real-time services, and backend automation deployed on AWS, GCP, or Azure with proper DevOps and MLOps discipline. Core Expertise AI Integration & Automation • OpenAI GPT / Whisper API integration • LLM-powered chatbots, assistants, and agents • Embeddings, vector stores, retrieval-augmented generation (RAG) • LangChain-based orchestration and agent workflows • PDF, document, and audio intelligence pipelines • AI automation for customer support, internal tools, and workflows Backend & Full-Stack Engineering • Node.js, Go, Python backend services • Scalable REST and event-driven APIs • Real-time systems with live updates • Secure payment integrations (Stripe, PayPal) • Webhooks, background jobs, queues Cloud, DevOps & MLOps • AWS (Lambda, EC2, Cognito, SNS, CloudWatch, ECR, ECS) • GCP and Azure production deployments • Dockerized services and container orchestration • CI/CD pipelines and environment automation • Scalable database design and performance optimization This combination allows me to own the full AI lifecycle: architecture, integration, deployment, monitoring, and iteration. Production Systems I’ve Built Chat APT A GPT-powered WhatsApp AI assistant that reached 8,000+ users and processed over 300,000 messages in 10 days. • Real-time messaging at scale • GPT-based conversation handling • PDF analysis and document intelligence • Audio transcription via Whisper • Production deployment with monitoring and fail-safes Swiftba An AI meeting assistant built for real users—not demos. • Node.js, React, GPT APIs • PostgreSQL and Firebase • Deployed on Google Cloud Platform • Designed for reliability and low-latency AI responses Booksquare GPT An AI PDF/Epub reader focused on deep document interaction. • TypeScript, React, Go backend • GPT-powered content understanding • Structured data extraction and semantic search • Production database architecture QInteractive An AI assistant designed for structured, contextual interaction with religious text. • Emphasis on accuracy, context preservation, and retrieval • Custom prompt engineering and response control Every one of these systems was built with production constraints in mind: performance, scalability, observability, and cost control. Technology Stack Frontend React, React Native, TypeScript, JavaScript, HTML, CSS Backend Node.js, Go, Python, C#, Java Databases PostgreSQL, MySQL, MongoDB, SQL Server Cloud & Infrastructure AWS, GCP, Azure Docker, ECS, ECR, serverless and containerized workloads APIs & Integrations OpenAI GPT & Whisper Stripe, PayPal Twilio, WhatsApp Google Maps, Shopify Why Clients Hire Me • I understand both AI and infrastructure • I move fast without cutting corners • I communicate clearly and directly • I design systems that scale beyond MVP • I treat your product like a production system, not a prototype I am a strong fit if you need: • GPT or LLM integration into an existing product • AI chatbots or assistants with real users • Document, PDF, or audio intelligence systems • AI-powered automation workflows • A senior engineer who can architect, build, and deploy end-to-end If you are building something serious and want AI that actually works in production, we will work well together. Send a message with your use case, current stack, and scale expectations. I will tell you quickly if I’m the right fit and how I would approach it.