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I build mobile apps — the real kind, native, shipped to the store, used by actual people — and lately the AI systems inside them. I've been doing the first for 20 years and the second long enough to know where it actually pays off. I'm Expert-Vetted on Upwork (top 1% of talent), with 100% Job Success, 5,700+ hours, and $200K+ earned. Behind that is 20+ years in software — a decade architecting enterprise systems at Accenture for Fortune 500s, then CTO of a SaaS startup I scaled from 3 to 30+ engineers and took to consumer scale. I'm completing Stanford's AI Professional Program now. What you get is a CTO-caliber technologist who never stopped writing production code. I work two ways, depending on what you need: ⸻ ★ MOBILE APPS — zero to App Store ★ (fixed-price) You have an idea or a validated concept; I deliver the finished app, live in the App Store and Play Store. Architecture, design, frontend, backend, deployment, and the part most people underestimate — actually getting through store review, native builds, push, Live Activities, the works. I've shipped 20+ mobile apps, several used by hundreds of thousands of people, and I handle the whole build personally. Shipping a native app to a store is a different discipline than deploying a web app, and it's the discipline I've spent years in. ★ AI SYSTEMS — design & build ★ (hourly) Production AI/LLM systems, not prototypes. My recent work is a multi-vendor LLM pipeline that benchmarked 21 model-and-strategy combinations across Claude, GPT, and Gemini over 54 recipe sources in 7 countries — automated quality scoring against an Opus gold-standard reference, and cost tuned across a 150x price spread down to the best quality-per-dollar. The hard part of AI work isn't calling an API; it's knowing where AI actually earns its keep, which model fits which job, and how to architect a pipeline that holds up in production. That's what I do, then I build it — often straight into the mobile products above. ⸻ The background behind that: 10 years at Accenture on large-scale systems for Fortune 500s in healthcare, telecom, oil & gas, and retail. Then CTO at a SaaS startup — engineering scaled 3 to 40, a multi-service platform shipped with payments, identity, and real-time processing running at consumer scale. 📎 Stanford — AI Professional Program (completing August 2026) 📎 Kellogg — Product Strategy 📎 TOGAF Certified Enterprise Architect ⸻ Native Mobile (React Native / Expo, App Store & Play Store delivery) · TypeScript/JavaScript · LLM APIs (Claude, GPT, Gemini) · Prompt Engineering · Multi-Model Pipelines · React · Next.js · Node.js · Supabase · PostgreSQL · AWS · Solution Architecture

🏆 𝗨𝗣𝗪𝗢𝗥𝗞 𝗘𝗫𝗣𝗘𝗥𝗧 𝗩𝗘𝗧𝗧𝗘𝗗 💪 Top 1% of performers | 15,000+ hours 🎖️ Top Rated Plus | 100% Job Success ✔︎ 20+ years experience in Embedded Systems, IoT & Full Stack Development I design and develop production-grade embedded and IoT systems, from firmware and hardware integration to cloud-connected platforms. Specialized in STM32, Nordic nRF52/nRF53/nRF91, ESP32, RTOS (FreeRTOS/Zephyr), and secure C/C++ firmware development. I help companies turn hardware concepts into reliable, scalable, real-world products. 🚀 𝗔𝗕𝗢𝗨𝗧 𝗠𝗘 I am a Senior Embedded Systems and IoT Engineer with over 20 years of experience delivering production-ready systems across embedded firmware, hardware design, cloud infrastructure, and full stack applications. I specialize in end-to-end system development — from low-level firmware and PCB collaboration to cloud integration and application layers — ensuring robust and scalable real-world deployments. I work with startups and engineering teams to transform complex ideas into reliable production systems. 🔧 𝗘𝗠𝗕𝗘𝗗𝗗𝗘𝗗 𝗦𝗬𝗦𝗧𝗘𝗠𝗦 & 𝗙𝗜𝗥𝗠𝗪𝗔𝗥𝗘 Extensive experience in production-grade embedded firmware development. ▸ 𝗠𝗜𝗖𝗥𝗢𝗖𝗢𝗡𝗧𝗥𝗢𝗟𝗟𝗘𝗥𝗦 & 𝗣𝗟𝗔𝗧𝗙𝗢𝗥𝗠𝗦 ▪ ARM Cortex-M ▪ STM32 ▪ Nordic nRF52 / nRF53 / nRF91 ▪ ESP32 / ESP8266 ▪ Raspberry Pi ▪ Arduino ▪ Microchip PIC ▪ Silicon Labs BGM220 ▸ 𝗥𝗧𝗢𝗦 & 𝗘𝗠𝗕𝗘𝗗𝗗𝗘𝗗 𝗔𝗥𝗖𝗛𝗜𝗧𝗘𝗖𝗧𝗨𝗥𝗘𝗦 ▪ FreeRTOS ▪ Zephyr RTOS ▪ Bare-metal firmware ▪ Multi-threaded systems ▪ Event-driven architectures ▪ OTA firmware updates ▪ Secure boot & encrypted firmware ▸ 𝗖𝗢𝗠𝗠𝗨𝗡𝗜𝗖𝗔𝗧𝗜𝗢𝗡 & 𝗪𝗜𝗥𝗘𝗟𝗘𝗦𝗦 ▪ UART, SPI, I2C, USB ▪ BLE, Bluetooth Classic ▪ LoRa / LoRaWAN ▪ Wi-Fi, LTE, NB-IoT ▪ RS232 / RS485 ▸ 𝗦𝗘𝗖𝗨𝗥𝗜𝗧𝗬 & 𝗡𝗘𝗧𝗪𝗢𝗥𝗞𝗜𝗡𝗚 ▪ TCP/IP, MQTT, HTTP/HTTPS ▪ TLS / mbedTLS ▪ ARM TrustZone ▪ Secure elements (Optiga, ST-SAFE) ▪ PKI systems ▪ JSON, XML, Protobuf ☁️ 𝗜𝗢𝗧 & 𝗖𝗟𝗢𝗨𝗗 𝗦𝗬𝗦𝗧𝗘𝗠𝗦 ▪ AWS IoT, EC2, S3, RDS ▪ MQTT-based architectures ▪ Industrial IoT platforms ▪ Telemetry & remote monitoring ▪ Cellular / NB-IoT / LTE devices ▪ Robotics & automation systems 💻 𝗙𝗨𝗟𝗟 𝗦𝗧𝗔𝗖𝗞 𝗗𝗘𝗩𝗘𝗟𝗢𝗣𝗠𝗘𝗡𝗧 ▸ 𝗕𝗔𝗖𝗞𝗘𝗡𝗗 ▪ Java (J2SE/J2EE), Spring ▪ JSF, JSP, Servlets ▪ Hibernate, JPA ▪ Node.js ▪ PHP / CakePHP ▪ REST APIs ▸ 𝗙𝗥𝗢𝗡𝗧𝗘𝗡𝗗 ▪ ReactJS ▪ JavaScript, HTML5, CSS3, Bootstrap ▸ 𝗗𝗔𝗧𝗔𝗕𝗔𝗦𝗘𝗦 ▪ MySQL ▪ Apache Derby ▪ Database design & optimization 🛠 𝗛𝗔𝗥𝗗𝗪𝗔𝗥𝗘 & 𝗣𝗖𝗕 𝗗𝗘𝗦𝗜𝗚𝗡 ▪ PCB design (Altium Designer / KiCad) ▪ Analog & digital circuit design ▪ Hardware bring-up & debugging ▪ Sensor integration ▪ Power systems ▪ Motor control (PWM, stepper, servo, robotics) 🧠 𝗜𝗠𝗔𝗚𝗘 𝗣𝗥𝗢𝗖𝗘𝗦𝗦𝗜𝗡𝗚 & 𝗔𝗜 ▪ OCR systems ▪ Signal processing & filtering ▪ Embedded AI / ML integration ▪ Sensor data conditioning ▪ Computer vision pipelines 🧪 𝗤𝗨𝗔𝗟𝗜𝗧𝗬 & 𝗦𝗘𝗖𝗨𝗥𝗜𝗧𝗬 ▪ Secure firmware architecture ▪ Veracode static/dynamic analysis ▪ System debugging & reliability engineering ▪ Performance optimization ▪ Production-grade system hardening 🧾 𝗣𝗥𝗢𝗚𝗥𝗔𝗠𝗠𝗜𝗡𝗚 𝗟𝗔𝗡𝗚𝗨𝗔𝗚𝗘𝗦 ▪ C / C++ ▪ Embedded C ▪ Java ▪ Python ▪ JavaScript ▪ PHP ▪ MATLAB 🎯 𝗗𝗘𝗩𝗘𝗟𝗢𝗣𝗠𝗘𝗡𝗧 𝗣𝗛𝗜𝗟𝗢𝗦𝗢𝗣𝗛𝗬 I focus on building reliable, maintainable, and production-ready systems by combining strong engineering fundamentals with real-world product experience across hardware, firmware, cloud, and software layers. If you need embedded firmware, IoT systems, cloud integration, or full stack development, I can help bring your product from concept to production.

Greetings All, I'm a Lead Architect with 11+ years of experience in web development. I have developed different kinds of projects, including eCommerce systems, CRM software, corporate websites, APIs and other internal scripts. • A quick learner with a penchant of performing under pressure. strong team player with excellent interpersonal and communication skills, strong analytical and problem solving skills. • Overall 11+ years of experience in development of Mobile, Web & Enterprise applications using PHP5, JAVA and J2EE Technologies. • Artificial Intelligence and Automation - Prompt Engineering, AI Agent Development using n8n - Large Language Model Integration and Conversational AI using Langchain and Botpress - AI Chatbots, Retail AI Voice Bots, and Generative AI • Hands on experience in Core Java, Servlets, JSP, JDBC, Spring, SpringBoot, Hibernate, JPA, JavaFX, JacpFX. • Hands on experience with DevOps, Shell Script, Docker, Docker Compose, Jenkins, AKS, Azure • Hands on experience in NodeJS, Angular, Angular 2-rc3, Ionic Framework. • Hands on experience in ReactJs and Redux Frameworks. • Hands on experience in MySQL, Postgres, Oracle, MongoDB, ArangoDB, SQL Server. • Hands on experience in Apache, Weblogic, Glassfish, JBoss/Wildfly and Tomcat web servers. • Hands on experience in Ejabberd, Openfire and Prosody XMPP Chat servers. • Hands on experience in WebRTC. • Knowledge of Eclipse, Intellij Idea, WebStorm tool for the development of java projects & Node/Angular. • Knowledge of Adobe DW, Aptana studio tool, PHPStorm for the development of PHP projects. • Knowledge of Business Process Management Tool jBPM5.3. Let me know about your goals and I will lead your project to success! ;)

I help startups and SaaS teams ship reliable, well-tested products by combining structured QA practices with a strong technical and SEO background. I’m a QA-focused engineer with hands-on experience testing AI-driven web applications like Noveli, where I designed and executed test cases, validated critical user flows (authentication, validation, content generation), and introduced automated testing using Cypress. I also bring experience with Playwright and CI/CD workflows to ensure consistent quality across releases. 🔹 What I Do Best QA & Testing (Primary Focus) Manual testing (functional, regression, exploratory) Test case design & documentation Clear, actionable bug reporting End-to-end testing with Cypress & Playwright CI/CD testing integration Technical & SEO Support (Secondary Strength) Technical SEO (indexing, site structure, performance) Debugging SEO-impacting issues (rendering, metadata, crawlability) Programmatic SEO systems (Next.js + CMS) Development Background (Supporting Skill) Frontend & backend debugging (React, Next.js, Node.js) Understanding of application architecture → better test coverage API testing & workflow automation (Zapier, Make) 🔹 Why Clients Work With Me I don’t just test—I understand how the product is built, which leads to deeper, more effective QA Experience with AI products and complex user flows (chatbots, dynamic content, edge cases) Strong focus on clarity, documentation, and reproducibility Able to move fast while maintaining structured QA processes Multilingual: English, French, Arabic If you need someone who can quickly understand your product, identify critical issues, and improve overall quality, I’m ready to jump in and contribute immediately.

A 𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 𝐟𝐮𝐥𝐥 𝐬𝐭𝐚𝐜𝐤 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 𝐰𝐢𝐭𝐡 𝐚 𝟏𝟎𝟎% 𝐉𝐨𝐛 𝐒𝐮𝐜𝐜𝐞𝐬𝐬 𝐒𝐜𝐨𝐫𝐞 building Java Spring Boot backends, modern web apps, n8n automations, and WordPress solutions that are robust, scalable, and delivered on time. I work at the intersection of enterprise backend engineering, full stack product development, AI-powered workflow automation, and WordPress helping startups launch MVPs quickly and helping businesses eliminate the manual work that slows their teams down. 🚀 What I'm Best At: 🔹𝐉𝐚𝐯𝐚 & 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 (𝐜𝐨𝐫𝐞 𝐞𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞): ☕ 𝐉𝐚𝐯𝐚 𝐄𝐜𝐨𝐬𝐲𝐬𝐭𝐞𝐦: Spring Boot, Spring MVC, Spring Security, Spring Data JPA, Spring Cloud, Hibernate, Kotlin 🖥️ 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝: Next.js, React, TypeScript, Angular, Tailwind CSS 💻 𝐁𝐚𝐜𝐤𝐞𝐧𝐝: Node.js (Express, NestJS), Python (FastAPI, Django) 💾 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬: PostgreSQL, MySQL, MongoDB, Redis ☁️𝐃𝐞𝐯𝐎𝐩𝐬 & 𝐂𝐥𝐨𝐮𝐝: AWS (EC2, S3, RDS, CloudFront, Lambda), Docker, Kubernetes, GitHub Actions, Jenkins 🔹 n8n Automation & AI Workflows: 🧠 Workflow Automation: n8n, Zapier, Make connecting your tools and cutting out repetitive manual work entirely 🤖 AI Integration: OpenAI, Claude, Gemini embedded intelligently into your products and business processes 📣 CRM & Lead Automation: email pipelines, WhatsApp, Slack, webhook-driven workflows, outreach systems 📦 Custom Automations: data sync, onboarding flows, report generation, notification systems, document processing 🔹 WordPress & WooCommerce: ⚡ Custom themes and plugins built from scratch no bloated templates 🛒 WooCommerce: payments, subscriptions, multi-vendor marketplaces 🔐 Performance optimization, security hardening, malware cleanup, and full site migrations 🧩 Page builders: Elementor Pro, Divi, Bricks, WPBakery, Gutenberg 🔹 Why Work With Me: › Top Rated with 100% Job Success consistent results across every engagement › I take full ownership of outcomes not just tasks and keep you informed at every step › Clean, well-documented code your team can maintain without needing me forever › AI-powered development workflow: I ship faster without sacrificing quality or cutting corners › Clear, proactive communication you'll never be left guessing about progress ⭐ What clients say: "Hamdan demonstrated strong expertise in Java Spring Boot and Next.js clean, efficient code that met all requirements." Marketplace Platform (681 hrs · $2,241) "Completed the AWS deployment exactly as promised. Highly recommend for CI/CD and AWS configuration." Spring Boot + AWS DevOps "Very understanding and always available. He makes sure everything is clear before moving forward." n8n CRM Automation "Delivered exactly what was needed with minimal instructions. Sincere, hard-working — I would highly recommend." NestJS / Angular + DevOps 🤝 Let's Talk — you might be a great fit if you need: - A Java Spring Boot API or full stack web application built properly from day one - An n8n automation workflow that saves your team hours every single week - A marketplace, SaaS MVP, or internal tool launched in weeks not months - A fast, secure, and conversion-ready WordPress or WooCommerce site - A reliable developer who communicates clearly, delivers consistently, and cares about your success Click "Invite to Job" or send me a message I'd love to hear about your project. 🚀

Senior Fullstack Software Engineer | Java, Node.js, React | CMS & IoT Expert 🚀 About Me I am a Senior Fullstack Software Engineer with 4+ years of experience in developing high-performance web applications, CMS platforms, and IoT solutions. My expertise spans across Java Spring Boot, Node.js, React, Magnolia CMS, and cloud-based architectures. I have led teams, optimized complex systems, and built scalable solutions for enterprise-level clients. 🔹 Backend: Java Spring Boot, Node.js, NestJS, Microservices, GRPC 🔹 Frontend: React.js, React Native, Headless CMS 🔹 CMS: Magnolia CMS, Liferay, WordPress 🔹 Databases: MySQL, MongoDB, SQL Server 🔹 DevOps & Cloud: Docker, Kubernetes, GitLab CI/CD, AWS 🔹 IoT & AI: Zigbee, MQTT, OpenCV, AI-based detection systems 💼 Notable Projects ✅ MMP’s CMS Website: Built a Java Spring Boot-based CMS optimized for high traffic and large datasets. ✅ Dentsu’s Headless CMS: Developed a scalable API-driven CMS using Magnolia CMS and React. ✅ Yoolife & YooIOC Applications: Smart city applications for residential and operational management. ✅ IoT Platform for Smart Devices: Developed a gateway integrating Zigbee, Z-Wave, and BLE devices with AI-powered event detection. 🔍 Why Work With Me? ✔ Proven expertise in enterprise CMS solutions & IoT systems ✔ Strong problem-solving skills in system architecture & optimization ✔ Experience leading development teams & mentoring junior engineers ✔ Passionate about building scalable, high-performance applications Let’s connect and bring your ideas to life! 🚀