E-commerce Site Customization

I'm looking for an experienced web developer to customize my e-commerce site. The areas that need customization include:

- Product Pages
- Checkout Process
- Homepage Design
-Integration with Square POS

I have some existing design assets, but will require additional design work.

Ideal skills and experience:
- Strong background in e-commerce website development
- Proficiency in customizing product pages, checkout processes, and homepage layouts
- Experience with design integration and enhancement
- Familiarity with popular e-commerce platforms
- Attention to detail and ability to meet deadlines

Please provide a portfolio of similar work and an estimated timeline.