Infinum WordPress Handbook

Our handbook is based on 7 years of experience in WordPress development, here are some numbers behind it:
hours of coding
lines of code
launched projects
WordPress has evolved a lot since its beginnings - from a simple blog CMS to a fully fledge CMS used for a wide range of projects: simple web sites, on line shops, complex multi site projects communicating with a wide range of APIs.
With the increased usage of WordPress in our company, we thought that it would be best to define a set of style guides for projects we work on. We try to follow WordPress Coding Standards for the most part but, being a software developing company working on a wide range of projects, we already use a certain coding standards that differ from the default WordPress Coding Standards.