Alexey upgraded the OpenTherm library to version 1.1.5 within the arendst/Tasmota repository, expanding supported commands to enhance HVAC control and interoperability. He refactored core firmware components in C and C++ to integrate the new library, focusing on maintainability and future extensibility. His work improved system control fidelity and reduced maintenance risk by ensuring robust protocol handling and clear version control traceability. Drawing on skills in embedded systems, firmware development, and IoT communication protocols, Alexey delivered a targeted feature that prepares the Tasmota platform for additional OpenTherm enhancements, addressing evolving requirements in smart HVAC integration and device management.