Ray M.

PCB designer and firmware engineer with over 4 years of experience and over 7 years of programming experience. I design 2-4-6-layer PCBs in KiCad, with a focus on ESP32/STM32 systems, sensors, USB, Controller boards, battery power, and small embedded/IoT devices. Portfolio : MuffinByteLabs .com Github: github .com/MuffinByteLabs I can take a board from schematic through PCB layout, fabrication preparation, assembly, and bring-up. My ESP32-S3 portfolio board is a 4-layer Wi-Fi sensor PCB that I designed in KiCad and had fabricated and assembled by JLCPCB. It includes native USB-C, Li-ion charging, automatic USB-to-battery power switching, battery monitoring, I²C sensors, and an analog sensor input. I also completed the board bring-up and bench testing after assembly. What I can help with: • Schematic capture and review • 2-4-6-layer PCB layout in KiCad • ESP32 / STM32 integration • USB-C power and USB 2.0 routing • I²C, SPI, UART, ADC, and sensor interfaces • LDOs, Li-ion charging, protection, and power-path circuits • Component selection and footprint verification • Decoupling, grounding, return paths, and stitching vias • Gerber, drill, BOM, and CPL/position files • JLCPCB / PCBWay fabrication preparation • DFM and pre-fabrication checks • PCB bring-up and bench validation For design-review work, I go beyond KiCad's ERC and DRC. I check whether the schematic, PCB, footprints, BOM, placement data, datasheets, and intended design actually agree with each other. If you have a schematic, existing PCB, breadboard prototype, or an idea that needs to become a manufacturable board, send me the requirements and I can tell you how I would approach it.