Gul J.

Embedded Systems Engineer with 8+ years of experience and $90,000+ earned on Upwork at a 100% Job Success Score. I design firmware, PCBs, and cloud-connected IoT systems — from ESP32 prototypes to commercial production hardware. Recent and current work includes: - Firmware development for a catheter reflow machine (medical device) - GUI/interface system for a medical device platform (ProceMed) - Long-term commercial IoT product development — 978 hours on a single engagement, from firmware to UI - ESP32-based sensor networks, motor control systems, and LED control (MADRIX/Advatek) - Cloud integration: AWS IoT and Azure IoT over MQTT, connecting embedded hardware to live dashboards Core skills: ✅ Microcontrollers: ESP32, ESP8266, Arduino, Raspberry Pi, STM32, Teensy, ATtiny, Atmel AVR ✅ Protocols: I2C, SPI, UART, MQTT, BLE, WiFi, LoRa, RS485/Modbus ✅ Cloud & Backend: AWS IoT, Azure IoT, FastAPI, PHP, Python server integration ✅ Hardware: Schematic capture, PCB layout, BOM, Gerbers, power supply design ✅ Languages: C, C++, Python, MicroPython, JavaScript I work across the full product lifecycle — from proof-of-concept (schematic, code, testing instructions) through to mass production (PCB design, Gerbers, pick-and-place files, BOM with sourcing). If your project involves ESP32, IoT, sensor integration, or connecting hardware to the cloud, message me with your requirements and I'll let you know honestly whether I'm the right fit. Gul | ESP32 | PCB Design | Embedded System | Electronics | Embedded C | Firmware Programming |