Expert PrestaShop 9.1 Upgrade

I need my live store moved from PrestaShop 8.0.0 to 9.1 without losing a pixel of its current look, a line of SEO value, or a single module. Previous attempts by other freelancers broke the site, so I’m only interested in someone who has already performed several successful PrestaShop 9.x migrations.

Scope of work
• Stage-site clone, full backup, and documented rollback plan.
• In-place upgrade to 9.1 while preserving design, all modules, and URL structure.
• Absolute continuity for the critical Payment gateways module.
• Database migration and clean-up—no orphan tables, no core hacks.
• Thorough pre-launch testing on the staging site, then seamless deployment to production.

What to include in your bid
1. Two or more examples of PrestaShop upgrades you personally completed (before/after URLs or screenshots).
2. Your experience specifically with PrestaShop 9.1.
3. A concise step-by-step approach and realistic timeline to finish the job.

Deliverable: a fully functional PrestaShop 9.1 store that mirrors my current design, keeps every module running (especially Payment gateways), and retains all existing SEO rankings.

Only proven PrestaShop specialists will be considered.