Full-Stack Platform
Gaudia
Queue Management System
TypeScriptReactNode.jsGraphQL+3
View details Hey, I'm Pietro Maltese.Friends Everyone calls me Piero.I'm a Software Engineer.
Selected Work
A collection of projects I've built.
AI / SaaS
Ocarina
AI Document Processing
HonoReactPostgreSQLOpenAI+3
View details PWA / Enterprise
Cadidro
Field Management System
ReactHonotRPCPostgreSQL+3
View details About
London-based full-stack engineer who loves shipping products end-to-end.
Along the way, I've been lucky to work with excellent professionals who fueled the passion I've always had for computing and programming.
I've hopped between backend and frontend, built mobile experiences, explored UI/UX and embedded systems, and spent time with realtime systems, SQL/NoSQL data stores, microservices, event-driven architectures, serverless, and observability.
Get in touch
Full-Stack Platform
Gaudia
Queue Management System
Gaudia is a comprehensive queue management system designed for businesses, public services, and high-traffic venues. The platform digitizes the entire visitor journey from check-in to service completion, providing real-time visibility for both staff and visitors.
TypeScriptReactNode.jsGraphQLMongoDBAWSAbly
Screenshots
Key Features
- Real-time queue tracking with WebSocket updates
- Physical and virtual check-in kiosks
- Digital signage displays for queue status
- WhatsApp-powered digital check-in via QR code scanning
- Appointment scheduling and reminders
- Multi-tenant organization support
- Role-based access control
- Visit analytics and reporting
Technical Implementation
Architecture
Monorepo with 19+ packages using pnpm workspaces
Backend
Node.js + Express with GraphQL API (DaVinci framework)
Database
MongoDB with Mongoose ODM
Real-time
Ably for WebSocket messaging and live updates
Infrastructure
Serverless on AWS (Lambda, SQS, S3, API Gateway) and Google Cloud Run
Frontend
React with Ant Design, MobX State Tree, Framer Motion
Triggers
Custom automation flows for third-party system integrations
Hardware
Raspberry Pi kiosks, touch displays, and thermal printers
Deployment
Pulumi IaC with automated CI/CD pipelines
Challenges
The main challenge was handling real-time synchronization across multiple kiosk devices and signage displays while maintaining data consistency. I implemented an event-driven architecture with Ably to ensure all connected clients receive updates within milliseconds.
Outcome
During the COVID-19 pandemic, Gaudia was deployed across all seven vaccination hubs in the province of Ragusa, Sicily, in collaboration with the regional Public Health IT Services (ASP). The system efficiently managed approximately 430,000 unique patient check-ins and journeys, significantly improving the vaccination process with sub-second queue updates.