The author of Beancount (a text based accounting software) is a Googler and he recently shared https://docs.google.com/document/d/1qPdNXaz5zuDQ8M9uoZFyyFis7hA0G

The author of Beancount (a text based accounting software) is a Googler and he recently shared https://docs.google.com/document/d/1qPdNXaz5zuDQ8M9uoZFyyFis7hA0G55BEfhWhrVBsfc/edit?usp=drivesdk https://docs.google.com/document/d/1qPdNXaz5zuDQ8M9uoZFyyFis... which is a pretty standard Google style design doc.