I have over 10 years of professional experience with Ruby, Rails, JavaScript and Linux, but I'm also familiar with other cool technologies.

Ruby
Ruby on Rails
JavaScript
React
Amazon Web Services
Docker
Git
HTML5
CSS
Linux
PostgreSQL
nginx
Custom HTTP headers with GitHub pages
How to make gnupg2 to fall in love with Docker
Build Your Own Cloud Fast, Thanks to Ansible and Automation
Turn your Raspberry Pi to powerful HTPC with OSMC
Installing custom Linux on Raspberry Pi 2
25 awesome tools every developer should have
Adding Email server autoconfig and autodiscover
Setting encrypted backup Email server
Add more complexity to your Emails - use DKIM and SPF
Setting secure, cloud-based backup system using git and box.com
Setting development environment on your Mac
Adding a little bit of SpamAssassin into Postfix, Dovecot, Sieve soup
Setting server-side mail filtering with sieve and dovecot