Short-Term React Native / Node.js Developer – Logistics Workflow Fix + Production Bug Support

We are looking for an experienced but cost-efficient full-stack developer for a short-term assignment on an already-developed e-commerce and logistics platform. This is not a new application development project. The platform is substantially complete and we need someone who can understand the existing codebase quickly, implement one focused logistics workflow correction, assist with deployment/testing, and remain available for a short period after launch to resolve real production issues. Platform The system includes: React Native Customer App React Native Driver App React / Next.js Vendor Panel React / Next.js Admin Panel Node.js backend / REST APIs MongoDB database MYSQL Multi-vendor marketplace SHEIN / Proxy Shopping module Barcode-based logistics and warehouse workflow Driver delivery and tracking COD and online payments payments Vendor, driver and financial management Main Development Task The current SHEIN / Proxy Shopping logistics flow needs one important correction. At present, when a SHEIN order is created, the system incorrectly treats the shipment as though it has already arrived at the local warehouse. This must be changed. Required workflow: Customer creates a SHEIN / Proxy Shopping order. Logistics status starts as Pending. The order must NOT automatically be marked as received in our Local Warehouse. The shipment remains pending/in transit until it physically reaches the local warehouse. When the shipment arrives, the warehouse operator scans its barcode. Only this barcode scan changes the status to Received in the local Warehouse. The existing local delivery workflow then continues from the the local warehouse to the customer (per the same delivery logic of the platform). Payment status and logistics status must remain independent. Deployment & Production Support After the modification is completed, we want the developer to: Review the relevant existing code and improve if needed. Test the complete SHEIN order flow end-to-end, ability to make it faster. Test barcode scanning and warehouse receipt. Test payment methods with the corrected logistics flow. Verify that existing marketplace deliveries are not negatively affected. Assist with production deployment if needed. Monitor initial real-life use after deployment. Investigate and fix bugs found during actual production use. Coordinate clearly with us when an issue originates from existing code rather than the new modification. Document any changes made. This will initially be a short-term assignment, with the possibility of long term future maintenance work if performance is good. Required Experience Please apply only if you have practical experience with: React Native Node.js / REST APIs React or Next.js MongoDB Existing/legacy codebases E-commerce order workflows Logistics/order status systems Barcode/QR scanning workflows Production deployment and debugging Experience with payment systems, warehouse systems or delivery applications is strongly preferred. What We Are Looking For We prefer a developer who: Can understand existing code quickly. Does not unnecessarily rewrite working functionality. Makes focused and clean modifications. Can debug production issues independently. Communicates clearly and responds reliably during the launch period. Is comfortable working with an existing developer/codebase. Offers a competitive rate.