I enjoy working with most programming languages and frameworks, but specially I love these technologies:
Multi-tenant SaaS based on Zend Framework with custom templates built for each client. Each template has it's own automated building process and may use Bootstrap, AngularJS or EmberJS.
Implements several different caching techniques and it's blazing fast!
API centric app that also has an Admin Interface.
The API queries a MySQL database that's managed via the admin interface, both are writen in PHP 5.6. The app is powered by Ionic Framework.
A colombian government website targeted at kids in the early childhood. This site was very slow and had a legacy Javascript code with really bad practices.
My job was to rewrite the Javascript engine making it backward compatible so that all contents, activities, videos and audios would still work. After I rewrote the engine, the site loaded over 66% faster and made less than 3% of request to the server.