Java entreprise application/microservices developement (DI, IoC, SpringBoot, SpringData)
Fun programming, basically. I don't like RoR stack. I prefer pure Ruby App + Rack + (Sinatra/Camping framework)
High performance backoffice integration systems, with more than 70 millions of dayly synchronizations and peaks over 100k synchronizations per minute.
Business logic microservices implementation. Integration against external systems via RESTful/SOAP.