E-commerce Site Optimization

I need an experienced developer to tidy up my existing e-commerce site. The site is currently facing several issues that need to be resolved for a smoother user experience.

Key areas for improvement:
- User registration/login: Simplify and secure the process.
- Search functionality: Enhance accuracy and speed of search results.
- Course functionality: Fix any existing issues with course access and navigation.

Current issues include:
- Error messages: Fix all error messages that disrupt user experience.
- Unresponsive design: Ensure the site is fully responsive on all devices.
- Membership function: Repair the non-working membership functionalities.
- Optimize Press: General optimization for better performance.

Ideal Skills and Experience:
- Strong background in e-commerce website development.
- Expertise in improving user registration/login and search functionalities.
- Experience with course management systems.
- Proficient in responsive design and error debugging.
- Familiarity with Optimize Press and membership site functionalities.

Please provide a portfolio showcasing similar projects and a brief outline of your approach. Looking forward to your bids!