Do computer animated films such as toy story, use linear or non-linear sound design? how is the job marker for it?
Computer animated films just like any other film use linear sound. Whether cutting tape or using pro tools, logic or most DAWs, you will be producing sound in a linear fashion. Every track is a line in the DAW and has a start and finish at a predetermined point. As you watch the computer animation the only non-linear control you have over the audio is to press play, fast forward rewind or pause. Non linear sound is present within different media forms like video games or sound toys where the user has control over when the sounds are triggered. Whether a button triggering a gunshot or being able to choose what radio station you listen to in the car in Grand Theft Auto, basically the sounds and music within games require triggers from the users actions making them non-linear.
I would suspect they use non-linear sound design, but there's probably some rebel out there still cutting tape, trying to prove us that things can be done outside of ProTools.
I've never designed for a CG film, but I did get the chance to sit in on a lecture about the graphics and modeling techniques, especially 3D, used by Pixar for Bolt, and we were shown very early cuts where they hadn't smoothed out some of the polys, let alone textured them, and even got to hear some of the early sound design. As far as I know, that wouldn't even be possible with linear editing.
As for the job market? It's the same job market we're all in... There's work out there, you just have to prove to the people paying for it that you're worth it.