Wenjun X.

I help businesses and startups turn ideas into production-ready electronic products — handling PCB design, embedded firmware, and manufacturing under one roof. With 10+ years of hands-on experience, I deliver reliable, cost-effective hardware that's built right the first time. I take projects from concept to finished device, so you don't have to coordinate between multiple engineers and vendors. Services I offer: PCB Design — Schematic capture, multi-layer PCB layout, signal & power integrity, and design-for-manufacturing (DFM). Complete fabrication packages delivered (Gerbers, BOM, assembly files). Firmware Development — Bare-metal and RTOS firmware for STM32, ESP32, AVR, PIC, and more. Communication protocols (UART, SPI, I2C, CAN, BLE, Wi-Fi) and low-power optimization. Manufacturing & Production — Prototyping, component sourcing, SMT/THT assembly, functional testing, and scaling from prototype to mass production. Whether you need a quick prototype, a full product design, or help moving an existing design into mass production, I can make it happen.