Residential Solar-Powered High Water Alarm for holding tanks Design

I am looking for an experienced electrical engineer to design a solar-powered high water alarm for holding tanks in residential use. This alarm will be installed outside, so it needs to be weather-resistant and durable.

Key Requirements:
- Design of a solar-powered high water alarm
- Suitable for outdoor installation
- Weather-resistant and durable design
- Full electrical drawings / circuitry, ready for production
- Full parts list
- List of recommended manufacturers in Vietnam if possible

Ideal Skills and Experience:
- Proven experience in electrical engineering
- Previous work designing solar-powered devices
- Expertise in creating durable, weather-resistant designs
- Experience with designing high water alarms would be a plus