João Marcos Kaminoski de Souza

At Castrolanda Cooperativa Agroindustrial, I coordinate mobile development and releases for a Flutter superapp serving 1,000+ users. I work closely with backend engineers on API contracts, OpenAPI specifications, MFA and multitenancy authentication flows.

I’m modernizing the superapp around a Widget → BLoC → Repository → Data Source architecture, with explicit asynchronous states, unit tests, Firebase Analytics, and Crashlytics. I also initiated GitHub Actions testing and APK distribution, helping feature test coverage grow from zero to above 70%.

I’ve built server-driven forms across roughly 20 workflows, an offline-first digital work-permit app, and a public event app that processed 60,000+ votes. Earlier, I delivered Laravel, Node.js, REST, payment, shipping, SOAP/WSDL, and Docker-based integration services at MMTech.

In personal work, I built Julia Board’s NestJS/TypeScript API, polygon-based persistence model, Flutter client, and Android homescreen widget. I enjoy making client-server boundaries explicit and shipping dependable mobile products.