I need an experienced full-stack developer to tighten up our existing e-commerce platform and extend it with true multi-currency power. What I want done • Backend – strengthen the current admin panel so it can handle multi-currency receipts seamlessly. Automatic currency conversion is mandatory, starting with USD (we will probably add EUR and GBP next, so design with that in mind). • Frontend – build a cloud payment layer that talks directly to the Airwallex API (https://www.airwallex.com/cn). This must let merchants list products in any currency they choose while allowing buyers to pay in whichever currency suits them. • Business qualifications – add three to five file-upload slots so merchants can show both sides of their ID cards and any licence images we require. • Deposit logic – introduce clear, enforceable limits on how much of a user’s deposit can be applied to each order. • Mobile verification – tighten SMS or app-based OTP flows for overseas numbers so the sign-up process is as smooth abroad as it is locally. Tech expectations I’m tech-agnostic as long as your solution plugs neatly into our current stack and the Airwallex SDK. Keep the code clean, well-documented and ready for my team to maintain. Deliverables 1. Updated backend modules with multi-currency receipt support and automatic USD conversion. 2. New frontend payment components fully integrated with Airwallex sandbox and live modes. 3. Extended merchant profile area featuring 3-5 document upload windows. 4. Deposit-limit logic deployed and tested. 5. Hardened overseas mobile verification flow. 6. Deployment scripts, brief technical hand-over and a short user guide. Timeline & quote Please outline realistic milestones, your estimated hours for each and a firm total price. I’m aiming to move fast once we agree.