Mobile
Native iOS in SwiftUI and native Android in Jetpack Compose, plus Wear OS and Android kiosk firmware. Offline first when the network cannot be trusted.
I design the systemsa company runs on.
Point of sale, ERP, human resources, supply chain, business intelligence and artificial intelligence: systems designed for settings where reliability, operational continuity and data quality are not optional.
21 products in production, developed end to end: from the data model and the architecture through to the native applications.
$whoami
William Mazza | Software Engineer
$cat ./focus
mobile | backend and data | Ai | security
$uptime
21 products | 8 brands | since 2020
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21
products in production
8
brands running on them
7
interface languages
2020
shipping since
What I do
From the data model to the App Store.
I design and develop every layer of the product: data model, backend, web applications and native apps. That is what keeps architecture, business logic and interface consistent, from the first design decision through to daily operation.
These are not prototypes: 21 products are in production today and in daily use.
Backend and data
NestJS and Node.js in strict TypeScript, Prisma on PostgreSQL, Redis and BullMQ for queues, warehouses that turn separate systems into one truth.
Artificial intelligence
Demand forecasting, OCR pipelines on vision and language models, retrieval augmented assistants, multi provider so no single vendor holds the product.
Security
Permission declared on every route and verified in continuous integration, multi tenant isolation under end to end tests, secrets in a manager and databases without a public address.
Selected work
21 products, in production.
Eleven management systems built to carry the operations of a multi brand hospitality group, running across 8 brands and more than 100 venues.
Alongside them, 10 business applications sold and supported through TechCorp, for a total of 21 products in production today.
K-POS
Multi company cloud point of sale for bars, restaurants and chains
- NestJS
- TypeScript
- Prisma
- PostgreSQL
- Redis
- 7
AtomicBI
Multi channel business intelligence for multi brand hospitality
- PostgreSQL
- Data warehouse
- Node.js
- TypeScript
- SwiftUI
- 2
Platform ONE
All in one multi tenant human resources for hospitality and retail
- Node.js
- TypeScript
- PostgreSQL
- React
- SwiftUI
- 2
SupplyONE
Cloud native ERP for food cost, inventory and HACCP
- Node.js
- TypeScript
- PostgreSQL
- Cloud Vision
- LLM OCR
- 1
InvestFood AI
Artificial intelligence for food and beverage
- Python
- Forecasting
- LLM multi provider
- RAG
- PostgreSQL
BiteOS
Loyalty, ordering, payments and kiosk under one operating system
- Node.js
- TypeScript
- Firebase
- PostgreSQL
- SwiftUI
- 2
AmministraPRO
Accounting, meetings and documents for property administrators
- TypeScript
- Node.js
- PostgreSQL
- React
EdilPlanner
Jobs, sites, crews and cost control for construction
- TypeScript
- Firebase
- React
Animiyo
Health, prevention and expenses for every animal
- SwiftUI
- Jetpack Compose
- Firebase
Integrations
The systems these products talk to.
Accredited SdI
Electronic invoicing.
Software infrastructure built on an accredited SdI channel, the Italian Sistema di Interscambio, over the SDICoop Web Service protocol, with the Sogei interoperability tests passed.
Companies
The companies behind the work.
NRC Company, Make Impossible and TechCorp are companies I founded and run directly.
At InvestFood Tech and InvestFood AI my role is technical: I design and develop the software systems.
In service every day
Some of the companies using this software.
Upcoming events
Where to find me in 2026.
Events I have attended
2025
Black Hat Europe 2025
Black Hat Europe
Certifications
Some of my certifications.
Let's talk about what you are building.
Email is the fastest route. I read everything and reply where I can be useful.
Write to me