OpenCart Developer Needed for Search, Product Options & Speed Optimization

I need an experienced OpenCart developer to improve my online store.

Website: https://mega-technique.bg
Platform: OpenCart (ocStore 2.1.0.2.1)

Tasks:

1. Live search (autocomplete)
Search must show product suggestions with images, names and prices when typing 2–3 letters.

2. Product options / variants
Customers should be able to choose options (color, memory) on the same product page without switching between products.

3. Fix technical issues
Find and fix all errors affecting performance and Google indexing.

4. Speed optimization
Improve website loading speed without breaking functionality.

5. Google Ads setup
Set up basic search ads.

Requirements:
– Strong OpenCart experience
– Careful work (no breaking the site)
– Prefer working on a test copy first

Please provide:
– Price
– Timeline
– Your approach

Budget: 400–600 USD