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I’m Simon, Heading the IoT Systems architecture at Maxlinktek (US), supported with my own high-performance R&D team in China. [Verified Profile Summary by Upwork AI System Engine]: “ An emerging IoT solution architect specializing in hardware and software integration, focusing on scalable IoT ecosystems. Demonstrated expertise in PCBA design, cloud infrastructure cost estimation, and embedded systems that facilitate seamless transitions from prototype to mass production [1] [2] [3]. Skilled in systems architecture, BOM optimization, and regulatory compliance, applying these capabilities to enhance design for manufacturing and production efficiency. Proven track record of delivering functional IoT products while minimizing costs and maximizing performance. Generated by Uma, Upwork’s Mindful AI, from completed jobs ” Skills: ● Systems/Product architecture. ● PCBA design (Altium/KiCad) ● Linux Kernel/APP development(C/C++) ● STM8/STM32/ESP32/CH59x BLE/Other MCUs development(C/C++) ● PHP Laravel + Swoole(server backend) ● VUE UI(HTML5/Javascript) ● Android/iOS APP development(Flutter/Electron) ● DFM (Design for Manufacturing): Optimization for high-yield assembly and die-casting to minimize defects. ● Mass Production (MP) Management: Experienced in overseeing the lifecycle from EVT/DVT/PVT to full-scale production. ● BOM Optimization: Strategic sourcing and component selection for supply chain resilience and cost-efficiency. ● Regulatory Compliance: Pre-scan and verification for international standards (UL, CE, FCC, IP67/68). I bridge the gap between US-standard strategic leadership and direct Shenzhen factory-floor execution.With 15+ years in Linux development & maintenance and 8+ years in professional PCBA engineering, I specialize in building production-ready IoT ecosystems — from the first circuit trace to global mass production. This setup allows me to provide US-standard communication and project management, combined with unmatched cost-efficiency and R&D speed through my dedicated team in China. FROM PROTOTYPE TO MASS PRODUCTION 🚀 WE BUILD SCALABLE IOT ECOSYSTEMS — NOT JUST DEMOS. Most IoT projects fail after the prototype stage. We bridge the gap between a "bench-top demo" and a global product launch.. 💡 WHY PARTNER WITH US? ● 30%-75% Hardware Cost Reduction: We replace bloated Android setups with high-performance Native ARM Linux. This achieves fluid UI/UX with lower hardware requirements and bedrock system stability. ● 20%-40% BOM Optimization: Leveraging deep Pearl River Delta supply chain expertise, we proactively suggest reliable chip alternatives to maximize your profit margins and secure components against global shortages. ● Zero-Gap Delivery: We perform deep on-site debugging and automated firmware flashing in China. You receive fully functional, validated hardware units—not bare, untested boards. 📦 PROVEN TRACK RECORD Due to strict NDA obligations with enterprise clients, only a selected portion of our portfolio is showcased below: ● LG DUOBO Coffee Machine: End-to-end integration (PCBA, Firmware, App). ● Nscreen32: World’s first LVGL-certified development board. ● Ntablet: Highly successful open-source hardware tablet framework. 🤝 WHO WE WORK WITH We partner with serious IoT startups and enterprise teams who view their hardware as a long-term venture. If you want to build a real, scalable product—not just a bench-top demo—we design for mass production from day one. 👉 Send an invite with a short description of your project, and I will suggest a high-level system architecture for your review.

Senior Software Architect specializing in secure systems and IoT Sec solutions with 15+ years of experience. I architect and deliver end-to-end nfc solutions, from embedded firmware to cloud-based backend systems. 🎯 CORE EXPERTISE IOT Systems - NFC Solutions: Reader/Writer, HCE, Digital Wallets (Android/iOS) - Smart Cards: JavaCard, MIFARE, DESFire, NTAG,Global Platform,GP,JCOP,Secure Element - Security: PKI, FIDO, Secure Element,HSM, PCI-DSS Compliance - RFID Systems: Asset Tracking, Access Control - EMV Payment: L1/L2/L3 Kernel Development & Certification - Microcontrollers: ESP32, STM32 (WiFi/BLE, RTOS) - Firmware: Secure Bootloader, OTA Updates, Real-time Systems - Industrial Applications: POS Terminals, Vending Machines, Access Control - IoT Architecture: Sensor Integration, Remote Management Full-Stack Development - Backend: Node.js, REST APIs, Database Design (SQL/NoSQL) - Cloud Services: Firebase, AWS/Azure/GCP Deployment - Mobile: Android (NFC APIs), iOS (CoreNFC), React Native - Desktop: Qt, .NET, Cross-platform Applications - Languages: C/C++, JavaScript/TypeScript, Java, C# 💼 SIGNATURE PROJECTS ✅ ESP32 IoT Systems - Created NFC-enabled payment solution with cloud integration - Built secure firmware with OTA update capabilities - Integrated Firebase for real-time data synchronization ✅ Cross-Platform Digital Wallet - Developed mobile wallet supporting EMV contactless payments - Implemented HCE and Secure Element integration - Built Node.js backend with Firebase authentication ✅ Enterprise RFID Solutions - Designed asset tracking systems for industrial clients - Implemented access control with NFC/RFID readers - Deployed cloud-based management platform ✅ EMV Payment Terminal Solutions - Developed EMV L2 & L3 kernel for contact/contactless terminals - Achieved EMVCo certification for payment applications - Implemented secure key management and transaction processing 🔧 TECHNICAL STACK Hardware: ESP32, STM32, NFC Readers, RFID Systems Backend: Node.js, Express, Firebase, REST APIs Database: MongoDB, PostgreSQL, MySQL, Firestore Cloud: Firebase, AWS, Azure, Docker deployment Mobile: Android, iOS, React Native Desktop: Qt, .NET, Windows/Linux Security: PKI, FIDO, PCI-DSS, Secure Boot 📋 CERTIFICATIONS & STANDARDS EMVCo, PCI-DSS, PBOC, Global Platform, ISO 14443 I deliver production-ready solutions with clean code, comprehensive documentation, and ongoing support. Available for both fixed-price projects and long-term contracts.

I help companies debug, stabilize, and ship embedded products on STM32, ESP32, nRF52, EFR32, NXP KL17, JieLi, HDSC, and other ARM / RISC-V platforms. Typical problems I solve: • STM32 hard faults, crashes, boot issues • Custom board bring-up and peripheral integration • BLE / LoRa / MQTT connectivity issues • RS485 / Modbus communication instability • Low-power optimization for battery-operated devices • OTA reliability issues • Porting firmware to new boards, MCUs, or RTOS platforms • Turning prototypes into production-ready firmware I have 15+ years of embedded development experience across industrial communication systems, low-power IoT devices, wireless products, and mass-production consumer electronics. My background includes product lines with more than 10M devices shipped. Core platforms and technologies: • STM32 / ESP32 / nRF52 / EFR32/ NXP KL17 / JieLi • FreeRTOS / Zephyr / Arduino / PlatformIO • BLE / LoRa / NB-IoT / 4G / Cat.1 • RS485 / Modbus / UART / SPI / I2C • AWS IoT / MQTT / OTA • Battery-powered and ultra-low-power systems Selected experience: • STM32H7 controller platform with dual-core architecture, LVGL UI, RS485 communication, and ESP32-S3 connectivity co-processor • Ultra-low-power fault indicator for utility networks with multi-year battery life and LoRa communication • BLE thermal printer platform focused on wireless stability, motor control, print control, and production reliability Why clients work with me: • Strong debugging and root-cause analysis • Real production and manufacturing support experience • System-level architecture thinking • Clear communication and practical decisions • Reliable long-term collaboration Available for: • Firmware debugging and stabilization • Custom board bring-up • New feature development • RTOS-based firmware architecture • Wireless and industrial communication projects • Long-term embedded support Based in China (UTC+8), with flexible overlap for US / EU / AU teams. Typical response time: within 4 hours. Currently available for new debugging, bring-up, and embedded firmware support projects.

I am an Electrical/Electronic Engineer having master's degree in electrical/Electronic Engineering with 14 years of experience in the field of Power electronics, Embedded systems, analog and digital electronics, Wireless sensor network and Internet of Things. I have developed hardware and Embedded systems of IOT devices, Environment Monitoring devices, Power electronic converters (DC -DC, AC to DC and DC to AC), Inverters, VFD (variable frequency Drive) simulation and Testing. I have skills and experience in following areas ✔Circuit Designing (analog and Digital), from concept to prototype and prototype to production ✔Firmware development based on STM32, Arduino, Raspberry Pi, ESP32 and ESP8266 ✔Wireless communication based on Lora Modules, Zigbee modules, NRF Module, NRF51822 BLE module ✔ IoT / Embedded Electronics Engineering Projects ✔Mathematical Modeling, Components Selection, Schematic Designing and PCB designing based on Altium Designer. ✔sourcing of components, negotiation of components and manufacturing of customized product ✔Testing and Debugging of Electronic circuits. ✔Hardware Designing of data loggers with sensors intergeneration. ✔Assembly services of electronic circuits and products ✔Robotics and automation ✔Power electronic converter circuit (buck converter, boost converter, inverters) designing testing and debugging ✔ ESP32 based projects like water quality tester, AI based gesture recognition system ✔ESP32 CAM based face recognition system ✔ESP32 based AI camera ✔ Arduino based embedded system projects using sensors and actuators' ✔Deep knowledge and expertise DC and AC motor driver designing ✔ EMI and EMC testing ✔Experienced Schematic and PCB designing trainer ✔ Experience embedded systems and IOT trainer

Full Stack & IoT Developer | Kiosk Systems | Mobile Apps | Embedded Solutions I help businesses turn ideas into complete, production-ready products. Instead of hiring separate developers for mobile apps, backend systems, and embedded devices, I provide end-to-end development covering everything from hardware integration to cloud services. Over the past 5+ years, I have built commercial software, IoT products, business systems, kiosk applications, and connected device solutions for startups, companies, and organizations. What I Deliver • Kiosk & Tablet Solutions * Customer feedback systems * Self-service kiosks * Visitor management systems * Android tablet applications * Offline-first business applications * Device management interfaces • Mobile & Cross-Platform Applications * Android and iOS applications * Desktop applications * Internal business tools * Modern, responsive user interfaces • Backend & Cloud Systems * REST APIs * Authentication systems * Admin dashboards * Reporting and analytics * Third-party integrations • IoT & Embedded Development * ESP32 and STM32 firmware * BLE, WiFi, MQTT, LoRaWAN * Serial Port communication * Sensor integration * Hardware-to-cloud connectivity Why Clients Work With Me • One developer responsible for the entire solution • Faster development with fewer communication gaps • Strong understanding of both software and hardware • Clean, maintainable, production-ready code • Transparent communication and reliable delivery Typical projects I work on include kiosk systems, tablet applications, IoT products, industrial monitoring solutions, connected devices, internal business tools, and custom software platforms. Whether you need a prototype, an MVP, or a complete product ready for deployment, I can help transform requirements into a reliable working solution.

🚀 Turn your product idea into a clear, buildable direction — before you spend time and money on the wrong approach. Many early-stage products fail not because of bad ideas, but because key engineering decisions are made too late — or based on incorrect assumptions. I help founders and product teams define the right path early: what to build, how to build it, and what to avoid. 🧭 Start here (recommended) If your idea is still evolving or unclear, I recommend starting with a short feasibility session. In this session, we will: • clarify your concept and constraints • identify key technical risks • define a practical prototype direction This helps avoid unnecessary iterations and costly mistakes before moving into design or prototyping. 🔧 What I do I support early-stage product development from idea to validated prototype: • concept clarification and constraint definition • mechanical architecture and system direction • feasibility and manufacturability evaluation • prototype strategy and iteration planning • engineering decision support before major investment Rather than only delivering CAD, I help you understand the full path: idea → prototype → validation → next step ⚡ Accelerated exploration To improve speed and clarity, I use AI-assisted workflows and 3D tools to quickly explore and compare design directions. This allows us to evaluate options earlier and reduce unnecessary iteration later. ⸻ 🏭 From digital to physical With my own workshop and 3D printing setup, I can support: • functional prototype development • enclosure and mechanical validation • small-batch prototype builds • real-world testing and iteration 🎯 What you actually get • a clear and practical product direction • early identification of risks and constraints • a structured path from idea to prototype • confidence in your next steps Not just design — but clarity on what should (and should not) be built. ⸻ 🧠 Typical projects • consumer products and smart devices • enclosures and functional mechanical systems • hardware startup prototypes • proof-of-concept builds • early-stage product validation 📦 How I typically work Most projects start with a focused validation phase before moving into full design. This ensures: • the right direction is defined early • risks are identified upfront • time and budget are used efficiently From there, I can support further development, prototyping, and iteration if needed. 📩 Next step If you’re exploring a new product idea and want to move forward with more clarity and fewer mistakes, feel free to reach out.