Hello! I'm a software and electrical engineer with experience in both cross-platform app development and embedded electronics such as Arduino, ESP8266 and more. I'd be able to oversee this entire project, I just need you to clarify one thing: Is the ESP32 code already developed, or do you require both the ESP32 code and the app? Please let me know via chat and we can discuss any more details of the project, budget and timeline. Warm regards.