ReLoop
Enterprise Circular-Commerce Platform & Escrow Architecture
Problem & System Purpose
Enterprise-grade circular commerce platform engineered for authenticated serialized electronics, 50-point technical grading certification, anti-hoarding checkout leases, and balanced double-entry escrow accounting. Built as a Quarkus 3.15 LTS modular monolith across 25 bounded contexts with ArchUnit boundary verification, transactional outbox async dispatcher, Firebase Google Sign-In authentication, and full Next.js 14 client with TanStack Query.
Architecture Blueprint
Modular monolith architecture built on Quarkus 3.15 LTS and Java 17, featuring strict ArchUnit bounded contexts, balanced double-entry journal lines (zero discrepancy), pessimistic row-locked 15-minute checkout leases, Firebase Google Sign-In with server-side ID token verification, and transactional outbox worker.
25 bounded-context domain modules with RESTEasy Reactive, Panache ORM, and ArchUnit architecture verification tests.
Balanced debit/credit journal transactions for escrow holds, seller payouts, platform commissions, and arbitrated disputes.
OAuth 2.0 Google authentication via Firebase SDK with server-side ID token verification through Google Identity Toolkit API.
Two-stage reservation acquiring pessimistic row locks (`SELECT ... FOR UPDATE`) with 15-minute leases enforced by PostgreSQL partial unique indices.
ApexGrid
F1 Race Ticket Reservation & Microservices Platform