Agile – Famous for User Stories, Weekly Sprints, Pair Programming, Code Reviews and Canban.
Lean – Focus on solving my customers' problems in small, incremental steps with a rapid feedback loop.
DevOps – Connect software development and IT operations with tools for continuous integration and deployment like Jenkins, Vagrant and Docker.
Progressive Enhancement – Incremental refactoring. No big rewrites. The right paradigm for every task, basically.
UNIX – Combine basic tools to create powerful ones. Bash scripting and system configuration.
Languages – Highly productive with node.JS, Objective-C and the go language.