> most would tend to lose career velocity as they jump from one domain to the next Absolutely. Gaining expertise in another domain would also cost time and eff

> most would tend to lose career velocity as they jump from one domain to the next Absolutely. Gaining expertise in another domain would also cost time and effort (and maybe money). So I would not do it first thing after graduation and would only pick an area that I really like, so the extra work does not feel like work. But if one gets to senior levels and does not want to go into management, having additional area of expertise opens a lot of doors. > Either you need a credential (major, minor, certificate), or you need work experience in it. This has not been my experience. IME the bar to cross is knowledge, being able to pass the equivalent of a code screen or a technical interview; few companies outside of highly regulated markets care about a piece of paper to substantiate skills. As always, just my 2c; YMMV.