I’m ready to move my store to the latest stable release of Magento 2 and put a brand-new theme in place—the design files are already finalized, so the job is all about clean installation and flawless integration rather than creative work. Alongside the core upgrade, several custom extensions (payment, shipping, and a couple of small UX helpers) need to be reviewed, updated, and made fully compatible with the new version and template. What I need from you: • Safely upgrade the existing Magento 2 instance, preserving all products, orders, customer data, and configurations. • Implement the provided theme exactly as designed, ensuring responsive behaviour and zero layout drift across modern browsers. • Refactor or patch each custom extension so everything works seamlessly after the upgrade—no broken checkout flows or admin errors. • Run regression tests and hand over a staging link for me to approve before we move to production. Please be comfortable with typical Magento dev tools (SSH, Composer, Git), follow best practices for module overrides, and document any code changes so future updates stay painless. If you’ve done similar upgrades with custom modules before, that experience will be invaluable.