I write software and sell it as service to private projects. All have a Web front end. I use Bitbucket and AWS for my projects.

Some are:
-Web Conference P2P using WebRTC and vertx/hazelcast backend.
-Electoral Exit Pool with grails.
-Electoral/demographic data reporting with grails, R and js/svg libs for visualization
-Statistical studies & analitycs

Some of my tools:
-Linux
-Grails & Groovy
-Java, Sdk
-SpringBoot, Gradle, Hibernate
Vertx, Hazelcast
-node.js
-R
-javascript/jquery/angularjs/vuejs
-html5/css/js
-Math & Stats & Reporting & analytics & ...
-SQL,Postgres,CTE,GIS,POSTGIS.