As someone who has been both a senior developer and a manager of developers, I think this is an excellent description. I'd add just a couple of things. The fir

As someone who has been both a senior developer and a manager of developers, I think this is an excellent description. I'd add just a couple of things. The first is communication skills. Someone at the senior level is expected to be able to communicate complex technical issues not only to other developers, but to less-technical people such as product managers and senior management. The second is that someone in a senior role (whether they're a developer or something else) has to start changing their perspective so that they consider the needs of the business and its customers. For example, a low-level developer might want to work with a language or framework that they find personally interesting, but a senior developer might understand that what their customers actually need is long-term reliability that would be easier to achieve with more stable technology.