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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 and other complex software — 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

As an AOSP (Android Open Source Project) engineer, I specialize in designing, customizing, and optimizing Android platform for various devices. My role involves working with the Android framework, HAL (Hardware Abstraction Layer), kernel, and system-level components to deliver tailored solutions for device manufacturers and developers. I am passionate about building robust and innovative systems that enhance user experiences and contribute to the Android ecosystem.

Hi, I'm Paul. Transforming complex tech ideas into market-ready products is my forte. With 8 years of hands-on experience, I offer end-to-end expertise in advanced PCB design, rapid prototyping, and robust firmware development for IoT, robotics, and ultra-low power applications. My background as a startup team leader ensures a product-centric vision and accelerated project/ MVP delivery. 1. What I Offer: End-to-End Embedded & Hardware Solutions - Advanced PCB Design & Hardware Development: Multi-layer PCBs for complex applications, focusing on reliability and performance. - High-Speed Design: Expertise in USB 2.0, HDMI 2.0, DDR3/DDR4/LDDR4, PCIe, NAND Flash, 10/100/1000/10Gbase-T1 Ethernet, PoE++. - Microcontrollers & SoMs: ARM Cortex-M3/M4 (STM32WL, ESP32, Nordic nRF52/53/91 series); custom boards for Raspberry Pi CM4, Orange Pi, iMX8, Jetson Nano/Xavier/Orin, RK3588, RK3568, RV1126, TI AM6254. - Power & Analog: DC-DC (Flyback, Boost, Buck, LDOs), motor control (BLDC, AC/DC servo via I/O, ADC, CAN), high-resolution ADC/DAC, Audio circuits. DFM/DFA & Compliance: Strong knowledge of manufacturing, assembly processes, and layout techniques for EMC/EMI compliance. - Tools: Altium Designer (Altium365/CircuitMarker), KiCAD, Eagle, EasyEDA; OrCAD, PSpice, CAM350. - Prototyping: Experience with BOM creation (Digikey/Mouser/JLCPCB) and combining dimensional drawings into precise Gerber formats. - CAD/3D design tool: SolidWorks, Inventor... 2. Robust Firmware Development: - Languages: C, C++, Python, Qt. IoT & Wireless: MQTT, Thingsboard, AWS IoT, Blynk; experience with RF, Wi-Fi, BLE, GSM (3G/4G/LTE), LoRaWAN. - Robotics: Expertise in ROS/ROS2 for applications like AGV, AMR, 6-axis robots. Low-level Interaction: Proficient in designing custom drivers, managing communication protocols (QSPI, I2C, RS485, RS232, CAN, Modbus TCP/IP/RTU). - UI/UX for Embedded: Figma, TouchGFX, LVGL for STM32, ESP32, Raspberry Pi. 3. Product & Project Leadership: - Startup Leadership: Proven ability to lead and manage cross-functional teams in startup environments. - Project Management: Expertise in managing design, fabrication, and procurement for cost-efficient and timely PCB acquisition. - Problem-Solving & Research: Strong initiative, research capabilities, and excellent troubleshooting skills for electrical evaluation, testing, and PCB issues. 4. Why Partner with Me? - End-to-End Product Vision: My background in leading startup projects provides a holistic view, ensuring your solution is not just technically sound but also viable and market-ready. - Deep Technical Mastery: From complex high-speed routing and power supply design to robust firmware for robotics and IoT, I handle intricate challenges with precision. - Cost & Time Efficiency: My knowledge of DFM/DFA and experience in optimizing BOMs, coupled with efficient procurement management, helps streamline your project and reduce overall development costs and time. Ready to turn your innovative idea into a high-quality product? Let's connect to discuss how my expertise can drive your project's success.

Full Stack Developer (7 Years) | Full-Time Freelancer I provide one-stop software solutions for startups and businesses. Instead of hiring separate frontend and backend developers, I build your entire product from the ground up—from server architecture to cross-platform clients. What I Deliver: - End-to-End Lifecycle: Architectural design - Backend/API - Pixel-perfect UI - Market Release. - Cross-Platform Expansion: Seamless apps for Android, iOS, Web, Desktop, and Wear OS with high performance. - Scalable Backend Systems: Fast, reliable, and maintainable backend services powered by Rust or Kotlin for long-term product growth. - IoT & Hardware Expertise: Advanced integration for Android-based IoT clients, including Kiosk Mode, Serial Port communication, etc. - Fast Delivery: Skilled in leveraging AI agents to speed up development, reduce repetitive work, and quickly turn ideas into production-ready features. Core Tech Stack: - Frontend & Mobile: Kotlin Multiplatform, Compose Multiplatform - Backend: Axum (Rust), Ktor (Kotlin) I turn sketches into flawless, scalable apps. As a full-time freelancer, I guarantee fast, transparent communication and dedicated availability. Let’s build something great together.

My professional career has spanned three interconnected tracks—Desktop Application Development, Embedded Software Development, and Hardware/Systems Engineering—spanning over 20 years since starting as a C++ programmer in 1999. In recent years, my focus has shifted toward high-impact Desktop Application development (including VBA automation, .NET Core/WPF modernization, and end-user support), while leading end-to-end projects that integrate AI, IoT, custom device drivers, scientific simulations, audio DSP, and video analytics. As a Top-Rated Upwork talent with 100% Job Success and $100K+ earnings, I deliver scalable, reliable solutions across PC, Web, Mobile, Embedded, and AI-powered systems. I have successfully completed 200+ projects, pioneering innovations like Vehicle/Face Recognition, OCR, LLM-based Chatbots (including ChatGPT/OpenAI API | Grok integration), Speech Processing, and advanced IoT integrations since 2008. I specialize in: AI & Machine Learning : OpenCV, TensorFlow, Tesseract OCR, Grok LLM, Google Speech APIs Device Drivers & Systems Programming : NDIS, WFP, USB, Bluetooth, WiFi, Printer (Monolithic/PS/XPS/Unidriver), PCI , Smartcard. Virtual Audio/Video Desktop & Cross-Platform Development : C++, QT, MFC, WPF, .NET, MAUI, ActiveX, Plugins Scientific & Engineering Simulations : CAD/ZW3D integration, OpenMP, Scientific and Engineering Simulation tools for research , STEM Tools , Instrumentation Software Solutions , Audio/Video Processing : JUCE, DirectX, FFMPEG, RTMP/RTSP, Video Analytics IoT & Embedded — ESP32, STM32, Raspberry Pi, MQTT, CAN, SignalR Leading a skilled team of C++/C#/Java developers, I modernize legacy systems (e.g., VC++ 6.0 to modern frameworks), build custom IoT-AI solutions, and provide exceptional troubleshooting/debugging for complex challenges. Clients choose me for proven expertise, timely delivery, and innovative results that turn visions into production-ready software. Need an AI-enhanced IoT system, robust device driver, scientific simulation tool, audio DSP solution, Instrumentation Software , or full-stack desktop/embedded application? Let's discuss how I can help bring your project to life—message me today!

As a seasoned innovator and software development expert from New York, with over 27 years of experience, I have a strong track record of success in creating innovative and high-quality products. My expertise lies in Windows-based software development using C++, as well as in medical software, medical billing codes, artificial intelligence, internet of things, and low-level programming such as kernel drivers. I also have a deep understanding of cyber security, cyber intelligence, vulnerabilities assessment, security research, encryption, blockchain, and cryptography, and have developed several unique platforms in these areas. Throughout my career, I have taken projects from concept to completion, turning ideas into mature and successful products. In addition to my hands-on experience, I am also an author, having written a C++ bestseller and currently working on a new book for a major publisher. I am eager to take on exciting and challenging projects and put my skills and experience to work for you. If you are in need of a skilled and innovative software developer, I would be happy to discuss your project further. I am a BBB Accredited business and a Microsoft Supplier, among my clients: Sony, IBM, OpenAI, Pixm Security, Deep Code, Security Snares and more. I have experience in medical applications, review and assign correct CPT codes to medical procedures, comply with Epic and Cerner requirements and use AI for such applications. I am a member of HTCIA.