We need an experienced CS-Cart / PHP developer for ongoing work on a multi-vendor marketplace. Work mode: Hourly (Upwork Tracker required) Process: • Paid test task (1–3 hrs) • 1-week trial • Daily 5-minute screenshare • Daily visible progress required • Only productive tracked hours approved • Replace if slow output for 2–3 days Tasks: • Bug fixes, speed improvements, template edits • CS-Cart addon development & modifications • Frontend UI fixes (TPL, Smarty, HTML/CSS) • MySQL optimizations • API + payment/shipping integrations Goal: Long-term hourly developer, 20–40 hrs/week. Deliverables Fix ongoing CS-Cart bugs and issues Improve site performance & Core Web Vitals Customize templates (TPL/Smarty) Build or modify CS-Cart addons Implement API / payment gateway integrations Responsive UI adjustments Daily progress updates + screenshare Clean, documented code delivered on staging