Question: What possible jobs are there at CERN?

Kristian Harder answered on 8 Nov 2013:

Ok, just for completeness: CERN is like a small town. There are restaurants, a post office, a travel agent, a bank, a fire brigade, a medical office, and you can work in all these places. At CERN, you can be a cleaner, an electrician, a secretary, a receptionist, security guard, lorry driver, crane operator, lawyer. And much more.
But I guess you are probably asking about science and engineering jobs. Even then, there are still lots of options. There are paid internships (for example for undergraduate students during the summer break, the so-called “summer students”), you can work there as part of your undergraduate degree, or Masters or PhD degree. Once you have a PhD or an engineering degree, you can have jobs that are limited to a few years (for scientists: postdoc positions), or even unlimited contracts.
Interestingly, though, most scientists working *at* CERN do not really work *for* CERN, but are paid by universities and institutes in other places, other countries. And for those people, the amount of time they actually spend at CERN varies a lot. Some of my colleagues at RAL have been paid by RAL but have been located at CERN for 20 years or more. Some, like me right now, are working on an experiment at CERN, but are usually located at their home institute, and only travel to CERN a few times a year for meetings or shifts or whatever. Engineers are a bit different from scientists – they are more likely to stay at their home institutions and only travel to meetings or conferences at CERN or elsewhere.
I am not sure this answers your question properly, maybe the others have more to say about this, otherwise just keep on asking!