Prestashop Core Upgrade & Compatibility

I’m ready to move my existing Prestashop store to the latest stable version and need an expert who can handle the full upgrade end-to-end without disrupting sales. The site currently runs on an older release which is old 1.7.8.7 and includes several pieces of custom code, so preserving those tweaks is critical. We want to know first-hand if it's possible to update to the latest version without losing information or to a better version since we are having problems with velocity and performance of our website Your mission: • Take a full backup, then upgrade the Prestashop core to the newest official release or one of the latest versions • Re-apply or refactor all existing customizations so the storefront, admin, and any bespoke modules keep working exactly as before. • Test every key flow—product browsing, cart, checkout, emails—on both desktop and mobile, fixing any version-related issues you encounter. • Verify that installed modules remain compatible; suggest replacements or updates where needed. • Provide a concise post-upgrade report outlining what was changed, known limitations (if any), and rollback instructions. Zero downtime or a clearly communicated maintenance window is preferred. If you’ve completed similar version jumps and troubleshooting for customized Prestashop stores, I’d like to see your approach and timeline. Our website is [login to view URL]

Project ID: 40430559