Optimize Landing Page and Checkout

I need a comprehensive conversion rate optimization for my website. The focus areas are:

Landing Page:
- Improve headlines and text
- Enhance images and visuals
- Revamp call-to-action buttons

Checkout Process:
- Redesign form layout and design
- Integrate a more efficient payment gateway
- Implement effective cart abandonment measures

Ideal Skills and Experience:
- Proven expertise in conversion rate optimization
- Strong copywriting and design skills for landing pages
- Experience in checkout process improvement
- Familiarity with various payment gateways and cart abandonment strategies

I'm looking for a freelancer who can demonstrate a track record of increasing conversion rates effectively. Please share your portfolio and relevant experience.