Make it three-dimensionalby adding a fourth circle with C-level skills and you've got the CTO diagram ! Seriously this is by far the smartest thing I've read associated with "senior developer", and can be of great use when hiring decisions need to be made.
Probably not the best word ... More like :
* be able to stand in front of investors and explain where you want to see the company in 5Y, and why
* create a great culture everybody share
* speak a language sales people, HR people, tech people, devops people, legal people can understand, and be curious about their different jobs
