There are many things that can and should be done pre-aliyah in order to be as prepared as possible for the Israel job market, including:
Researching if your profession exists, is in demand in Israel, and has any special skills that you don’t have (part of the networking process)
Checking whether your professional qualifications need to be validated and accredited in Israel
Starting to network
Improving your level of Hebrew - at every opportunity you can
Examining your transferable skills - those that can be applied in a wide variety of jobs
Subscribing to and searching Israeli newspapers, email lists, aliyah movements or organizations
Updating your CV for the Israel market - If you will be looking for employment in different fields, make different versions of your CV available. Create a Hebrew version of your CV, particularly if you will be looking to work in the public sector
Arranging letters of recommendation from current/previous employers
Considering a place to live in Israel that will maximise your employment opportunities
Considering the option of keeping your current job if appropriate
If possible, organizing a pilot trip