In the last few years, I’ve spoke in a couple of conferences:

Evoluindo a experiência web no SporTV Play com React (Evolving SporTV Play web experience with React)

A evolução de uma arquitetura distribuída (Evolution of a distributed architecture)

Arquitetura distribuída: escalando times e projetos (Distributed architecture: scaling teams and projects)

Design Patterns em Ruby (Design Patterns in Ruby)