Worked on the espressif/arduino-esp32 repository to address hardware mapping reliability for M5Stack Atom devices within the ESP32 Arduino core. Focused on embedded systems and hardware abstraction using C++, the developer delivered a targeted bug fix that corrected the LED_BUILTIN mapping to GPIO 35 in the pins_arduino.h file. This change ensured that the built-in RGB LED functions as expected in Arduino sketches, directly improving hardware reliability and developer experience. The work demonstrated careful validation and clear traceability through a focused commit, reflecting a methodical approach to maintaining accurate hardware-to-software integration in embedded C++ environments.