I think this touches upon an important point: "employability" will depend on which subsector of the so called "software industry" you're aiming for. Enterprise

I think this touches upon an important point: "employability" will depend on which subsector of the so called "software industry" you're aiming for. Enterprisey places will ask for Java. Startup'y places might ask for Python/Django or Ruby/Rails. Embedded software (microprocessor places) or Video game places will ask for C. Apple will ask for Objective C. "Employability" without putting in some constraints really doesn't make much sesnse.