Waterproof Silicone Barrier Plug Design

I'm seeking a skilled product engineer to help design a waterproof silicone barrier plug in three sizes: small, medium, and large. This is for a new enterprise, and I have a basic idea but need assistance with the details.

Key Requirements:
- Design a silicone barrier plug
- Ensure waterproof functionality
- Create three size options: small, medium, large
- Collaborate on design details and requirements

Ideal Skills and Experience:
- Experience with silicone product design
- Knowledge of waterproofing techniques
- Strong problem-solving skills
- Background in product development for personal use items

Please provide samples of previous work and a rough timeline for the project.