// PRODUCTION SYSTEM ARCHITECTURE
Three Commerce Storefronts
3storefronts, one codebase
Three live e-commerce storefronts running on one hardened Laravel multi-tenant core.
Data & Execution Topology
INPUT DISCOVERY
Incoming HTTP requests on distinct domains (ecom1 / ecom2 / ecom3)
PROCESSING CORE
Tenant resolution middleware + transactional checkout pipeline
OUTPUT GUARANTEE
Verified order execution, atomic stock allocation, and customer notification
STEP 01Tenant Resolution
STEP 02Pessimistic Stock Lock
STEP 03Payment Gateway
STEP 04Idempotent Webhook
STEP 05Order Settlement
Key Engineering Decisions
§1Pessimistic concurrency locking (`lockForUpdate`)
To eliminate race conditions when multiple shoppers attempt to buy the last remaining stock item simultaneously, stock records are queried using `lockForUpdate()` within an atomic `DB::transaction()`.
§2Idempotent payment webhooks
Payment gateways frequently retry webhooks on network timeouts. Incoming event IDs are recorded with Redis locks; repeated webhooks return immediate HTTP 200 without executing duplicate order fulfillments or double charges.
§3Unified Blade component hierarchy
90% of the UI (cart logic, modal dialogs, checkout forms, image carousels) is shared through reusable Blade components, with store-specific themes isolated in dedicated view namespaces.
Engineering Implementation Breakdown
// frontend
Modular Blade template architecture using shared components, partials, and layout stacks.
// backend
Hardened Laravel 11 application with custom tenant resolution middleware and queued background jobs.
// database
MySQL schema with composite indexes, foreign key constraints, and pessimistic locking.
// apis
RESTful payment gateway integration with cryptographic webhook signature verification.
RETURN TO WORKSPACETAJUL ISLAM // DHAKA, BANGLADESH