Heist Danmark App
Interactive survey and rewards app where users earn $HOINS coins to bid in live-streamed auctions or shop in the integrated marketplace.
Visit heist-danmark.comSurvey & Live Auction Platform
- Client
- Heist Danmark
- Year
- 2024
- Timeline
- 10 months
- Team
- Mobile Developer (React Native), Backend Engineer (.NET Core), UI/UX Designer, QA Engineer
The idea behind Heist Danmark App
Heist Danmark App is a comprehensive mobile ecosystem combining market research, real-time entertainment, and e-commerce. Users complete surveys to earn $HOINS tokens, which serve as the app's currency. These tokens unlock two primary experiences: bidding in live-streamed auction events powered by WebRTC technology, and purchasing products from the integrated HEIST store. The platform creates a unique blend of gamification, social interaction, and tangible rewards, transforming traditional survey participation into an engaging, multi-faceted experience.
Built with
- React Native
- React.js
- Node.js
- .NET
- PostgreSQL
- Redis
- Socket.io
- WebRTC
- Push Notifications
What we built
- Live-streamed auction events with real-time bidding
- Interactive survey platform with instant $HOINS rewards
- Integrated e-commerce marketplace
- Real-time token wallet and transaction history
- Live chat during auction streams
- Push notifications for upcoming auctions and surveys
- User profiles with bidding history and achievements
- Social leaderboards and gamification elements
What was hard, and how we solved it
The hard parts
- Maintaining sub-second latency for live auction bids across global users
- Preventing survey fraud and ensuring data quality
- Scaling WebRTC streams to thousands of concurrent viewers
- Managing real-time token economy without blockchain overhead
- Synchronizing auction state across mobile and web platforms
- Handling payment processing for both token and fiat transactions
What we did about them
- Implemented Socket.io with Redis pub/sub for horizontal scaling of real-time features
- Built WebRTC infrastructure with multiple quality tiers and automatic fallback
- Developed fraud detection algorithms analyzing survey completion patterns
- Created optimistic UI updates with server reconciliation for auction bids
- Designed event-sourcing architecture for audit-able token transactions
- Integrated CDN with adaptive bitrate streaming for global auction delivery
- Implemented queue-based survey distribution to prevent spam
After launch
- 100,000+ completed surveys with 85% completion rate
- 15,000+ active users participating in auctions weekly
- €500K+ worth of $HOINS distributed
- 500+ successful auction events with 97% uptime
- Average of 2,000 concurrent viewers per major auction
- Partnership with 50+ research companies
- 4.6★ average app store rating
Inside the app
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