Job Description

[Job Description] . Develop firmware for Wi-Fi and Bluetooth Low Energy (BLE)-enabled wearable devices . Control MCU-based hardware including sensors, buttons, LEDs, motors, and other peripherals . Implement Bluetooth and Wi-Fi communication with smartphones and external devices . Design communication protocols for device status and sensor data transmission . Work closely with hardware, mechanical, app, and product design engineers for system integration . Build prototypes, debug hardware/firmware issues, and perform functional verification . Optimize and stabilize firmware for mass production . Support manufacturing tests and production validation . Develop and maintain OTA (Over-the-Air) firmware update functionality

Qualifications

[Technical Skills] . C / C++ . Embedded C . FreeRTOS or other RTOS . Wi-Fi / Bluetooth / BLE . UART / I2C / SPI / USB . MCU-based Embedded Systems . Git [Qualifications] . Strong background in embedded firmware development . Proficiency in MCU firmware development using C/C++ . Hands-on knowledge of Bluetooth and BLE communication . Basic understanding of Wi-Fi communication and networking . Ability to develop and interface with UART, I2C, SPI, and other hardware interfaces . Ability to read and analyze circuit schematics and hardware datasheets . Skilled in device driver development and hardware-level debugging

Preferred

[Preferred Qualifications] Hands-on development with ESP32, STM32, Nordic nRF52/nRF53, or similar MCUs Familiarity with products integrating both Wi-Fi and Bluetooth BLE integration with smartphone applications Knowledge of BLE GATT Service / Characteristic design Working knowledge of MQTT, TCP/IP, HTTP/HTTPS, WebSocket, and related network protocols OTA firmware update implementation Low-power design for battery-powered wearable devices Battery management and power optimization Integration of IMU, accelerometer, gyroscope, proximity, and other sensors Firmware stabilization and production test support for mass-produced products Familiarity with KC / CE / FCC wireless certification requirements Wearable or IoT product development for mass production Korean language proficiency preferred

Etc

[Development Environment] MCU: STM32 / Nordic / ESP32 series, etc. Connectivity: Wi-Fi / Bluetooth Low Energy (BLE) OS: FreeRTOS or Bare-metal Programming Languages: C / C++ Version Control: Git Debugging Tools: J-Link / ST-Link / Logic Analyzer / Oscilloscope, etc. Collaboration: Hardware Design / Mechanical Design / App Development / Product Design

Preferred Visas

Cover Letter

Required

Portfolio

Optional