Optimize WP Online Shop

I need a developer to optimize my nearly ready-to-launch WordPress & Woo commerce online shop. The main focus is on improving loading time, but also need help with WhatsApp connection, payment functionality, and a few minor issues like imprint at another place and some text and image changes. The shop works currently in 5 languages.

I need a dev who thinks by himselve, fixes bugs in programming and UI by himself and checks the page for a last beta check on all pages for bug free funcionality. only after he says, pages is now ready to go, i will check it once more and if fine page has to go live. ONLY PROFESSIONAL DEVS, NO BEGINNERS!

Key Optimization Tasks:
- Loading Time: Prioritize improving server response time, minimizing CSS and JavaScript, and optimizing images.
- WhatsApp Connection: Ensure seamless integration and functionality.
- Payment Functionality: Verify and set up all necessary payment gateways.

Ideal Skills:
- Strong experience with WordPress and site optimization.
- Familiarity with performance analysis tools (like Google PageSpeed Insights or GTmetrix).
- Knowledge of CSS, JavaScript, and image optimization techniques.

Please share your relevant experience and approach to this task. Looking forward to your bids!