Can I vibe code BigCommerce?

Build a multi-tenant B2B/B2C e-commerce backend in Go using PostgreSQL, Redis, and GraphQL.

CORE DATA MODEL:
1. Product & Catalog: Products, Variants, SKUs, Custom Attributes (JSONB), Option Sets (Color, Size), Categories (closure table for deep nesting), and Digital Assets.
2. Pricing Matrix: Price Lists, Price List Records (SKU, Tier Quantity, Price, Currency), Customer Groups, and Customer-Specific Price List assignments.
3. Inventory & Multi-Location: Inventory Locations, Stock Levels per SKU/Location, Safety Stock, Reserved Stock, and Channel Allocation Rules.
4. Orders & Checkout: Carts, Checkout Sessions, Orders, Line Items, Shipments, Order Status State Machine, Discounts/Promotions applied, and Transactions.
5. Customers & B2B: Companies, Company Locations, Users/Roles (Admin, Buyer, Approver), Credit Limits, and Payment Terms (Net 30/60).

PROMOTIONS ENGINE:
Implement a deterministic rules evaluator supporting:
- Order-level percentage/flat discounts.
- SKU/Category specific buy-X-get-Y (BXGY) logic.
- Stacking constraints (exclusive, priority order, max discount caps).
- Customer group restrictions and coupon code validation.

MULTI-LOCATION INVENTORY ALLOCATION:
When an order checkout completes:
1. Lock inventory rows using PostgreSQL 'SELECT FOR UPDATE' to prevent race conditions during high-volume sales.
2. Allocate stock across multiple locations based on proximity/priority rules.
3. Increment 'reserved_quantity', convert to 'fulfilled_quantity' upon shipment creation.
4. Publish inventory change events to Redis Pub/Sub for real-time frontend updates.

CHECKOUT & PAYMENT GATEWAY INTERFACE:
Create an abstract Payment Gateway Adapter supporting Braintree, Stripe, and Adyen.
- Support multi-currency settlement.
- Store tokenized payment methods (never raw PANs).
- Implement webhook processors for asynchronous payment notifications (e.g., authorized, captured, refunded) with idempotent processing using Redis locks.

OUT OF SCOPE:
- Native visual theme builder / WYSIWYG editor.
- Built-in blogging platform.
- Mobile native apps.
- Direct native tax filing (delegate tax calculation to an external API interface).

FAILURE MODES TO HANDLE:
- Race conditions on inventory during flash sales (must fail fast or queue requests gracefully).
- Floating-point errors in currency handling (all money values must use 64-bit integer cents/smallest currency unit).
- Idempotency enforcement on order submission to prevent double-charging on network dropouts.

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