As you might already guessed from the website title my name is Jonas John and I’m a freelance developer. I grew up near Ulm in Southern Germany but I also lived for a long time in Berlin and other parts of Germany. Currently I am working as a freelance developer in the Düsseldorf area.
Since I got curious about computers and started with programming about 15 years ago I worked with a lot of different programming languages, systems and frameworks. Here you see a list of my previous professional jobs, but that is just a brief summary of my overall work experience.
Working on smaller customer projects. Also did some proof of concept / research projects with new technologies like: node.js, express.js, node-webkit, mobile app development (with Android), C++ & QT, ...
Worked on internal (web) applications and created data analysis software by using the Perl Dancer Web Framework, JavaScript (Backbone.js & jQuery), MySQL, Shell scripting, Python and much more...
Helped to develop web based affiliate tracking software. My tasks included Perl development, database administration, front-end development, customer support, UNIX system administration, development environment setup (version control, test system hooks, customer managment, automatized customer deployments) and much more.
Web application development, web design and Search engine optimization with PHP, MySQL and JavaScript.
Web application development with ASP.net, C# Windows Application development, and production machine development with C# (including threading logic, state machines and working with third-party COM objects).
Web application development, web design, CMS development using Perl, PHP, JavaScript and MySQL.
This is a rather incomplete list of all my IT skills. I’m also quick to pick up new technologies and eager to discover better ways to solve a problem.