Design a High-Loudness EV Horn -- 2

I need an electronic designer to create a compact, waterproof, 12V EV horn with an inbuilt relay system that can handle X amps safely. It should be cost-efficient and manufacturable.

Key requirements:
- High loudness is a priority
- Long durability is essential
- Compact and waterproof design
- Must comply with ISO 9001 standards

Ideal skills and experience:
- Expertise in electronic design, especially for automotive applications
- Experience with waterproof and durable product requirements
- Familiarity with ISO 9001 standards and certification processes
- Cost-effective design solutions

Please provide samples of previous work and relevant qualifications.