Hi, I'm Paul — a PCB Designer and Firmware Engineer with 8+ years of experience delivering hardware solutions for IoT, robotics, industrial electronics, and consumer products. ✅ PCB DESIGN (Schematic + Layout): - Multi-layer PCBs (2/4/6/8 layers), HDI and BGA routing - High-speed: USB 2.0, HDMI 2.0, DDR3/4/LPDDR4, PCIe, 1G/10G Ethernet, PoE++ - Custom carrier boards: Raspberry Pi CM4/CM5, iMX8, Jetson Orin, RK3588 - Power design: DC-DC (Buck/Boost/Flyback), motor control (BLDC, AC/DC servo) - High-resolution ADC/DAC, analog signal conditioning - DFM/DFA review and EMC/EMI compliance. ✅ FIRMWARE DEVELOPMENT: - Languages: C, C++, Python, Qt - MCUs: STM32 (M3/M4/M7), ESP32, Nordic nRF52/53/91, RP2040 - Custom drivers, RTOS, and bare-metal development - Protocols: UART, SPI, QSPI, I2C, RS485, CAN, Modbus TCP/RTU - Embedded UI: TouchGFX, LVGL ✅ EMBEDDED SYSTEMS & IoT: - IoT platforms: MQTT, AWS IoT, Thingsboard - Wireless: BLE, Wi-Fi, LoRaWAN, GSM/4G/LTE - Robotics: ROS/ROS2 for AGV, AMR, 6-axis robotic arms - Custom motor driver boards and sensor integration ✅ TOOLS: - PCB: Altium Designer, KiCAD, Eagle, EasyEDA, OrCAD - 3D/Mechanical: SolidWorks, Inventor - Sourcing: JLCPCB, Digikey, Mouser ✅ DELIVERABLES: - Schematic + PCB source files - Gerber, drill, pick-and-place files - BOM with sourcing recommendations - Firmware source code with documentation - 3D enclosure files ✅ TRACK RECORD: 230+ completed projects across previous freelance platforms with 5-star average rating. New to Freelancer.com. I'm starting to building presence here, but bringing the same engineering quality and reliability. ✅ WHY HIRE ME: - End-to-end ownership from concept to production - Startup leadership background — product-centric, MVP-focused - Fast turnaround with clean documentation - Clear communication, full English fluency - Response within a few hours Let's discuss your project.