Continuous Integration as a job?

Hello good people of Networking,

I got a job offer as a sales rep at a company called CircleCI, they provide continuous integration. I'm trying to understand how big the market for CI is and how valuable it is to developers. Do you developer's think CI is a big market? Does it provide tremendous value to developers?

I'm only asking because I want to join and work for a company where I can stay for the long run and not jump around. I'll probably take the job offer if I get some confirmation.

Cheers,

Daniel