Case study
Auclux
Realtime dual-auction marketplace
Penny and market auctions with React web, Flutter mobile, Express/PostgreSQL backend, Socket.io bid feed, Stripe payments, wallet/bid packs, and Firebase push.
Product overview — full frame
01 — Challenge
The problem we solved
- Need engaging realtime auction UX across web and mobile
- Wallet, bid packs, and payments must stay consistent
- Admin tooling for categories, auctions, and winners
02 — Goals
What success looked like
- Three-client, one-API architecture
- Realtime bidding with Socket.io
- Stripe live payments + wallet ledger
- Flutter MVVM mobile parity
03 — Signals
Capability profile
Measured strengths across delivery, innovation, and operational maturity.
Web+Mobile+Admin
Client coverage
Socket.io
Realtime layer
Stripe live
Payments
Flutter MVVM
Mobile stack
04 — System design
Architecture
Three-client realtime stack
React web, Flutter mobile, and admin share one Express API. PostgreSQL via Sequelize; Socket.io for live bids; Stripe for payments.
- 101
Clients
Layer 1 of 4React + ViteFlutter GetXAdmin web - 202
Realtime API
Layer 2 of 4ExpressSocket.ioJWTnode-cron - 303
Payments
Layer 3 of 4StripeWallet ledgerBid packs - 404
Data & push
Layer 4 of 4PostgreSQLFirebase FCMNodemailer
05 — Stack
Technology stack
Production tools powering this product — icons for quick recognition.
Node.js
Express
PostgreSQL
React
Flutter
Socket.io
Stripe
Firebase
Docker
Tailwind CSS
06 — Capabilities
Key features
Penny + market auction types
Live bid feed and auction history
Wallet ledger (paid, free, referral, spend)
Stripe checkout and bid packs
FCM push + admin CMS surfaces
07 — Deep dive
Structure & detail
Auction domain
| Model | Purpose |
|---|---|
| Auctions | Penny/market lifecycle + timers |
| AuctionBids | Per-bid records |
| BidHistory | Wallet ledger |
| PaymentPlan | Bid pack products |
| AuctionWinners | Winner assignment |
08 — Outcomes
Business impact
Engagement
Live bidding across web and mobile
Monetization
Wallet + bid packs + Stripe
Roadmap
Clear path to NG gateways and engine hardening
Closing note
A working dual-auction product with solid full-stack foundations and realtime bidding across platforms.
