A transparent digital auction house spanning web and mobile: fleet owners list cars and lots, customers compete in real-time live auctions with automatic proxy bidding, then reserve and pay online — backed by an ERP-synced invoicing pipeline and a full inventory state machine from listing to delivery.
Vehicle remarketing in the Gulf ran on offline, opaque channels — fleet owners and dealerships moved inventory through closed deals with no transparency, no real-time competition, and invoicing reconciled by hand against an enterprise ERP. The goal: replace it with a transparent, real-time digital auction house across web and mobile, where any verified bidder could compete live — without losing a single bid to a race condition.
Live auctions are unforgiving. When dozens of bidders hammer the same lot in the final seconds, the system has to be the single source of truth: every bid ordered correctly, no lost updates, no two “winners,” proxy auto-bids resolved instantly — reflected on web and mobile in real time, in Arabic and English (RTL), and kept in lockstep with a Microsoft Dynamics 365 ERP.
- One contract, three clientsAn Nx monorepo with a Laravel 11 API serving a Next.js 14 web app and a Flutter (BLoC) mobile app, so web, iOS, and Android share the same types and behavior.
- Server-authoritative real-time biddingLive bid state in Redis with atomic increments; a Socket.IO/Node layer broadcasts to every watcher. The server, not the client, decides bid order — eliminating race conditions and lost bids under load. <200ms bid latency end to end.
- Proxy auto-biddingBidders set a max ceiling; the engine auto-counters rivals up to it, server-side, so they win at the lowest necessary price.
- Inventory as a state machineEvery lot moves through listed → live auction → reserved → paid → delivered, with admin governance at each step.
- Three-tier accessAdmin / Company / Customer, each behind its own JWT guard (multi-guard RBAC).
- Enterprise sync & paymentsTwo-way Dynamics 365 ERP sync for customers, vehicles & invoices; Amazon Payfort payments; GoInfinito OTP + KYC bidder authorization; FCM push; PDF/QR invoices; AWS S3.
- A transparent, real-time auction house live on web, iOS, and Android (App Store + Google Play).
- Real-time live bidding at <200ms latency, with proxy auto-bidding and zero lost-bid race conditions.
- Offline, opaque remarketing replaced by a digital pipeline from listing to delivery, with ERP-synced invoicing.
- Shipped on trunk-based alpha/beta/prod (Docker, GitHub Actions CI/CD, AWS).
Engineering write-up: Real-time Auction Bidding with Laravel, Redis and Socket.IO →
