Michal Bartak developed and delivered Shelly Bulb RGBW device integration for the bramstroker/homeassistant-powercalc repository, focusing on accurate power calculation and streamlined device onboarding. He created configuration files and a model JSON, incorporating calibration data for color temperature and hue/saturation to ensure precise measurement and control. Using JSON for device configuration and calibration modeling, Michal enabled plug-and-play support for Shelly RGBW bulbs, reducing setup complexity and broadening compatibility within PowerCalc. Although the work spanned a single feature over one month, it demonstrated depth in device metadata modeling and laid a foundation for future RGBW device support and calibration-driven enhancements.