Gonçalo Pereira contributed to two open-source projects, focusing on both documentation accuracy and embedded systems development. For the nextcloud/all-in-one repository, he improved the backup migration documentation by correcting command usage, ensuring users could reliably transfer backup archives between hosts. In the esphome/esphome repository, Gonçalo implemented end-to-end support for the HDC2080 temperature and humidity sensor, handling configuration, I2C communication, and data integration within the ESPHome platform. His work involved Python and C++ programming, as well as sensor integration and collaborative code review. The contributions addressed practical user needs and demonstrated depth in both software documentation and embedded hardware support.