Can I vibe code Eurosender?

1. SYSTEM OVERVIEW
Build a custom European multi-carrier shipping aggregator backend and booking portal in Node.js/TypeScript using PostgreSQL. The system acts as a middleware connecting standard ecommerce checkout platforms to carrier APIs (e.g., DHL Express, DPD, GLS) for parcel rate fetching, label generation, and tracking.

2. DATA MODEL
- Shipments (id, order_id, sender_address_id, recipient_address_id, weight_kg, length_cm, width_cm, height_cm, status, selected_carrier, tracking_number, customs_declaration_id)
- Carriers (id, name, api_endpoint, credentials_encrypted, markup_percentage, active_flag)
- RateQuotes (id, shipment_id, carrier_id, service_level, base_cost, final_price, currency, expires_at)
- CustomsDeclarations (id, shipment_id, hs_code, item_description, declared_value, country_of_origin, tax_id)

3. CORE FUNCTIONALITY
- Rate Engine: Receive origin/destination postal codes and dimensions; simultaneously query connected carrier APIs; apply internal margin rules; return ranked shipping options to the frontend.
- Label & Booking Service: On shipment confirmation, trigger carrier booking APIs, download ZPL/PDF shipping labels, store securely in S3, and generate commercial invoices for cross-border non-EU routes.
- Tracking Webhook Handler: Expose webhook endpoints to ingest real-time status updates from carriers; normalize carrier-specific status codes into standard states (pending, picked_up, in_transit, customs_clearance, delivered, exception).

4. FAILURE MODES & EDGE CASES
- Carrier API Timeouts: Fallback to cached rate matrices or trigger failover carriers if a primary carrier API takes >2 seconds to respond.
- Volumetric Weight Discrepancies: Automatically flag quotes where dimensional weight exceeds physical weight.
- Invalid Address Formats: Integrate ISO-country postal code validation regex prior to calling carrier APIs to prevent booking rejections.

5. OUT OF SCOPE
- Negotiating freight carrier rates or liability insurance claims.
- Oversized LTL/FTL truckload bidding systems.
- Customs brokerage representation.

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