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Hi, I'm David. I help turn complex electronic concepts into dependable, production-ready products. With over 5 years of practical experience, I support clients through the full development cycle, from initial design to functional prototypes and manufacturing handoff. My focus is on building efficient, scalable, and cost-conscious hardware systems that perform reliably in real-world conditions. 1. What I Deliver: Embedded Systems & Hardware Development - PCB Design & Hardware Engineering: Circuit design, multi-layer PCB layout, component selection, impedance tuning, compact design, and cost optimization. Emphasis on IPC standards, signal integrity, EMI/EMC mitigation, and thermal considerations. - High-Speed & Complex Systems: Hands-on work with DDR, HDMI, MIPI (CSI/DSI), PCIe Gen1/2, along with SoC and FPGA-based prototyping. - Embedded Platforms: STM32N6, STM32H7/STM32H5, STM32F7/STM32F1/F3/F4, ESP32/ESP8266, Nordic nRF52 series, ARM Cortex-A systems, Raspberry Pi (CM4/CM5), Zynq-7000. - Power & Mixed-Signal Design: Switching regulators (Buck, Boost, Flyback), LDOs, battery systems, motor control (BLDC, stepper, servo, DC), and analog/digital integration, PoE, LLC. - Manufacturing Readiness: BOM preparation, Gerber generation, and design adjustments to streamline production and reduce costs. - Tools: Altium Designer, KiCad, LTspice, Proteus, MATLAB/Simulink . 2. Firmware & Software Development - Programming: C, C++, Embedded C, Python (for automation and validation). - System Development: Linux-based platforms, MCU firmware, RTOS (FreeRTOS), power optimization, bootloaders, OTA updates, and debugging. - Connectivity & IoT: WiFi, BLE, LoRa, Zigbee, GSM/LTE/NB-IoT/5G, GPS, RFID, NFC. - Communication Interfaces: UART, I2C, SPI, I2S, RS232, RS485, CAN, Modbus RTU/TCP, USB, Ethernet. - User Interface: LVGL-driven GUIs, TFT/OLED displays, and touch interfaces. 3. Development Process & Collaboration - Product Lifecycle Support: Concept → prototyping → validation → production handover. - Workflow & Management: Organized development using Git, Jira, and structured documentation with clear milestones. - Global Collaboration: Experience working across US, EU, and Asia time zones with consistent communication. - Troubleshooting: Strong capability in diagnosing and resolving both hardware and firmware issues. 4. Why Choose Me? - Unified Skillset: Combined hardware and firmware capabilities help minimize back-and-forth and speed up delivery. - Practical Engineering Approach: Designs are built with real-world constraints in mind — not just theory. - Efficiency-Oriented: Focus on reducing unnecessary costs while maintaining performance and reliability. - Clear & Responsive Communication: Regular updates, well-documented progress, and quick feedback. Looking to bring your idea into a functional, well-engineered product? Feel free to reach out. I’d be glad to discuss your project !!!

I am a professional Embedded Engineer with over 10 years of experience in embedded systems design, covering both hardware and firmware/software development. I have also set up and led a full-service engineering team, delivering complete products from concept to production, including hardware design, embedded software, cloud integration, and, AI, mobile app development, product/industrial design. I specialize in wireless IoT devices, wearable/medical technology, and embedded firmware with a strong background in end-to-end product development and team leadership. What We Can Offer Firmware Development - Embedded software for IoT, wearables, medical, and consumer electronics - Driver development, RTOS integration, and low-power optimization - Connectivity stacks: BLE, Wi-Fi, NFC, LoRa, LTE, CAT-M1, NB-IoT - Secure OTA updates, device provisioning, and cloud integration Hardware Design - Custom PCB design with multiple layer and layout for high-reliability embedded systems - Power management & battery systems (BMS, energy optimization) - Prototyping, testing, and design-for-manufacturing (DFM) Product & Industrial Design - Mechanical design, 3D modeling, and enclosure development - Ergonomics and usability design for consumer and medical devices - Design-for-production (DFP) and certification support (CE, FCC, FDA-ready) AI & Data Processing - Edge AI/ML model deployment (Edge Impulse, TensorFlow Lite) - Predictive maintenance and anomaly detection for IoT/IIoT - Cloud-based AI integration with AWS/Azure/Google Cloud Mobile App & Cloud Integration - Cross-platform mobile apps (Android/iOS) - Secure Bluetooth, Wi-Fi, and cloud connectivity with devices - Web portal/dashboard development for monitoring and analytics

I am an hardware and embedded systems engineer with over 5 years of experience in PCB design, firmware development, and technical consulting for low-power electronic products. I specialize in battery-powered devices, wearables, and IoT systems, with a strong focus on power optimization, hardware reliability, and design for manufacturability. I have worked on projects for global clients across the US, Europe, and Asia, supporting the full product lifecycle from system architecture and component selection to schematic/PCB design, prototyping, debugging, and production readiness. My goal is to deliver clear, efficient, and production-ready engineering solutions. What I Offer: 1. Hardware Design PCB design and hardware development for reliable, manufacturable products Experience with multi-layer boards and common interfaces (USB, Ethernet, memory, wireless modules) MCU and SoM-based designs (STM32, ESP32, Nordic, Raspberry Pi CM, Jetson, Rockchip, NXP) Power, analog, and basic motor control circuits DFM/DFA awareness to support manufacturing and compliance Tools: Altium, KiCad, EasyEDA; basic 3D/CAD support for enclosure alignment 2. Firmware & Embedded Development Embedded C/C++ development with supporting scripts/tools (Python) Wireless and IoT systems: BLE, Wi-Fi, Cellular, LoRa, MQTT, cloud integration Driver development and common protocols (I2C, SPI, UART, RS485, CAN) Embedded UI support using lightweight frameworks when needed 3. Product & Project Experience Startup and small-team environments with a strong product focus Experience coordinating hardware, firmware, and prototyping workflows Practical problem-solving, debugging, and iterative improvement during development 4. Why Work With Me Clear, product-oriented engineering approach Balanced focus on performance, cost, and manufacturability Reliable delivery and transparent technical communication If you’re looking for an engineer who can support your product from concept to working hardware, I’d be happy to connect.

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.

We are team with 8 engineers We have more 20 years of electronic designs. With more than 14 years working for Top PCB SERVICE company in USA and 3 years working with Japanese Company. I can done pcb design with best quality for production I am designer of High speed applications (FPGA Based PC cards equipped with DDR2/DDR3/DDR4 memories, Gbit links, High speed clocks, PCI-E, USB2.0/3.0/3.1, High speed FPGA FPGA interfaces, etc),RF, Power. I can do from idea to production Cad tool :Cadence Allegro, Altium, KICAD, Have worked with major jobs below: 1/. Cisco - Position: Leader - Detail: Layers (30), Components (12000), High speed, SGMII, XAUI, XFP, SFP, Backplane SERDES, PCIe, DDRx, Back drill... 2/. INTEL - Position: Leader - Detail: Layers (16), Components (3400), High speed 10G, QSFP, PCIe, DDR4 DIMM, Ethernet, Blind via and Buried via, Back drill... 3/. CADENCE - Position: Leader - Detail: Layers (30), Components (8000), High speed 20G, QSFP, PCIe, DIMM, Ethernet, Back drill... 4/. CPACKET - Position: Leader - Detail: Layers (18), Components (8500), High speed 40G, SFP, PCIe, DDRx, Ethernet, Back drill... 5/. WESTERN DIGITAL - Position: Leader - Detail: Layers (22), Components (6000), High speed 40G, SFP, PCIe, Ethernet, Backdrill... 6/. FACEBOOK - Position: Leader - Detail: Layers (20), Components (3500), High speed 10G, RF, SFP, PCIe, Ethernet …

Hello! My name is Tuan, Hardware Design Engineer. (Link portfolio: surli.cc/vvrspk) My job is design hardware circuit, test circuit, program for electronic product and program software on PC to manage/communicate with circuit boards. I have more than 5 years experience in design hardware for IoT Products, Consumer Products and Telecom Products. So I think I can try my best to complete your project with best result. Just give me your requirements/product specification. Then we can discuss about the deadline, price and other features. Below is my work flow in hardware design: - Receive your requirements, discuss to have final product/circuit specs - Design block diagram for circuit: need to very detail, it will decide what part will be used in project - Design schematics: follow block diagram to design schematic for product - Design PCB Layout: with requirement about Mechanical Design and Industrial Design, i will do the PCB Layout the fit with your MD that archive best performance - Extract production data: BOM, CAD, GERBER, DESIGN, ASSEMBLY GUIDELINE, IMPEDANCE CONTROL REQUIREMENTS, ... Something about my experience: - About microcontroller: STM32F0/F1/F2/F4/F7, MSP430, MSP432, ATMEGA, PIC, ... - About Wireless MCU: ESP8266, ESP32, CC2538, CC2540/41, nRF51822/nRF52840,... - About Sensor: light sensor, CO, Smoke Sensor, Dust Sensor, Air Sensor, pH sensor, Ultrasonic sensor.... - About wireless communication: WiFi, BLE4.0/4.1/4.0, Lora, Zigbee, Sub1GHz, ... - About GPRS/3G/LTE Module: SIM800C/H, SIM900A, SIM908, SIM5320, SIM5360, Quectel MC60/M95/UC15/UC20, SIM7600E. - About highspeed PCB Design: DDR3/DDR4, SATA, HDMI, USB2.0/3.0/TypeC,... - About Mass Production: I can help you prepare production data that help you do the mass production. I also have experience in mass production process for Smart Plug, Enviroment sensor Device and IR Remote with very big quantity, so I will know how to design for manufacturing with your product, design mass production process, etc In addition, I also have 2 years of experience in UI/UX design. I specialize in Web and Mobile UI/UX designs. Going from usability, accessibility, and interactions to visuals and emotions, I’m dedicated to creating the best experience possible for the user in the project’s outcome. I hope to work with you, to help you complete your project and release your product to the market.