WooCommerce Vertical Mega Menu Development

I need a skilled developer to create a vertical dropdown mega menu for my WooCommerce shop from scratch. The menu should be fixed and include categories and subcategories.

Requirements:
- Vertical dropdown style
- Fixed position
- Categories and subcategories content

Ideal Skills and Experience:
- Proficiency in WooCommerce
- Experience with custom menu development
- Strong understanding of WordPress and PHP
- Knowledge of HTML, CSS, and JavaScript

Please provide examples of similar work.