5 Non-Technical Skills Any Great Software Developer Needs

There are two big items missing from this list

Empathy and understanding of users: If you don't know who your building for, and how they will use your app, you have no way of knowing if your doing the right thing or wasting time.

An understanding of business and accounting: Working for a startup and don't know what a cap table is. Does your businesses numbers make sense? Are your efforts going to capex and is it appropriate.

Some of these things can be forgiven of a Jr. engineer. By the time your a lead, you should have a solid grasp on both of them.

Yes, these are great. But, I would add ability to promote your talents without being blunt. If you don't no one else will. If by chance someone else does it, it's not towards your advantage but theirs.

Also, don't fall into the stereotypical lone/geeky programmer. If you can't interact with people then it's very hard to write great software.