I worked in one of their virtual worlds. Job possibilities is limitless, however if you aren't working for the company, and working inside the virtual world, you really have to be determined to make it work, or else, Second Life income isn't anything to keep you on your feet. However, if you have good values, good ideas and think you can start a revolution, - more... slowly you will build a empire and make a fortune inside like some companies already do.
As for Linden Lab itself, the employees are always friendly with the community, and loveable. If you are looking for work, doing some fun activities ... - less