WP Online Shop Bug Fix and Optimization

I'm looking for an experienced WordPress developer to fix bugs and optimize performance on my online shop, currently in development.

Key Tasks:
- Fix functional errors and performance problems
- Optimize images for fast loading
- Ensure responsiveness across all browsers and mobile devices (Android & iOS)
- Simplify price and size displays with user-friendly pulldowns
- Improve checkout process, product display and filtering, and overall navigation/UI
- Ensure seamless payment processing with credit cards and PayPal

Ideal Skills and Experience:
- Proficiency in WordPress development
- Strong problem-solving skills
- Experience in UI/UX design
- Familiarity with payment gateways
- Ability to work proactively and identify potential issues