Worked on the esphome/esphome repository to enhance the ESP32 build pipeline by refactoring the post-build process for firmware deployment. The approach involved updating the Python-based post_build.py script to prioritize configuration sources such as flasher_args.json and FLASH_EXTRA_IMAGES, while providing safe default behaviors. Integrated esptool.py to merge binary sections into a single .factory.bin, this solution improved the reliability and consistency of device flashing across both CI and production environments. The work focused on build system reliability, embedded systems, and scripting, reducing manual intervention and maintenance costs while supporting scalable ESP32 deployments with deterministic and traceable build outcomes.