HTML/CSS Modern E-Commerce Website

I need an experienced web developer to build a clean, mobile-first website using pure HTML, CSS, and JavaScript. The site will act as a small online store and company profile, so speed, responsiveness, and straightforward code structure are essential.

Scope
• Pages: Home, About Us, Services/Products, and Contact (with working form).
• E-commerce: set up a simple product catalog and integrate checkout with DANA as the primary payment gateway.
• Communication: add a prominent WhatsApp chat/button so visitors can contact us instantly.
• Performance & SEO: compress assets, implement lazy-loading, add meta tags, structured data, and create an SEO-friendly URL scheme to ensure fast load times and basic search visibility.
• Cross-device consistency: the layout must adapt flawlessly to phones, tablets, and desktops, passing Google’s mobile-friendly test.

Deliverables
1. Fully responsive front-end code (HTML5, CSS3, vanilla JS) with clear comments.
2. Product listing template + cart/checkout flow connected to DANA.
3. Contact page with validated form that delivers messages to my email.
4. WhatsApp click-to-chat integration.
5. On-page SEO setup and Lighthouse performance score 90+.
6. Deployment guide so I can move the site to my preferred hosting.

Please share similar projects from your portfolio and outline your estimated timeline for design, development, testing, and hand-over.