João Angello

Software engineer in Cuiabá, Brazil. I build systems that hold up in the real world, from .NET APIs to AI products that talk to people on WhatsApp.

Scroll to see the work

From the center of South America

I studied Computer Engineering at IFMT and build software for healthcare, government and my own products.

Today I work on digital transformation for the State of Mato Grosso and, as a freelancer, design and ship systems for companies that need something solid, not just a pretty prototype.

Work

Agtech SaaS In development

SiloScan

3D scanning for grain silos. Each scan’s point cloud becomes an estimated volume, a history and alerts for the farmer.

.NET 10 backend with Clean Architecture, point clouds stored as COPC in object storage.

  • .NET 10
  • DDD
  • Point clouds
  • MinIO

SaaS for clinics In development

Recepta

An AI receptionist that answers patients on WhatsApp, books appointments and hands the conversation to staff when a human is needed.

Multi-tenant, direct integration with the official WhatsApp API and a live dashboard for the clinic team.

  • AI
  • WhatsApp Cloud API
  • Multi-tenant

API for Unimed Shipped

Ouvidoria

An ombudsman API that records member complaints, issues regulator-format protocol numbers and alerts the right people.

Vertical Slice Architecture with Minimal APIs, input validation and automated notifications.

  • .NET 10
  • Minimal APIs
  • EF Core
  • Docker

Also building

WhatsApp Web CRM
A browser extension with reply templates and a kanban board for conversations.
Delivery tracking
A system to follow projects and deliverables across an entire state department.

Approach

Lasting software starts with the domain, not the framework. Business rules sit at the center; databases, queues and screens live at the edges and can be swapped.

  • Domain at the center

    DDD and Clean Architecture so business rules are testable and readable by people who didn’t write them.

  • Continuous delivery

    Docker, pipelines and cloud infrastructure from day one, so shipping is routine.

  • Responsible AI

    Language models where they truly help, with a human in control when the decision matters.

Everyday tools

  • C# / .NET
  • Node.js / NestJS
  • TypeScript
  • React / Next.js
  • Python
  • PostgreSQL
  • Docker
  • AWS
  • Cloudflare

Path

  1. IFMTComputer Engineering degree
  2. Unimed Mato GrossoSystems for a health insurance cooperative
  3. FreelanceCustom systems, automation and AI products
  4. SEPLAG-MTDigital transformation office, State of Mato Grosso

Let’s build something

Have a system to get off the ground, a role or an idea to discuss? Write to me, I reply within two business days.

Send an emailjoao@joaoangello.dev

Cuiabá, the geodesic center of South America.