As somebody who spent 7 years as a defined hikikomori; that is, zero friends, lived alone through government assistance, and no job - I don't believe you can be considered one if you maintain employment. A hikikomori is defined (cultural aspects aside) as someone who cannot cope with society and so they withdraw. However, the moment you obtain a job you have something in your life you must oblige to, as opposed to sitting alone, inside, not communicating with anybody real, you do go out.

While you can maintain a lifestyle of solitude through not having friends or partaking in lonesome activities, you are now more of an introvert, nothing more. Unless their is still some medical issue at hand, such as agoraphobia of something, you're not really a hikikomori unless you're giving into solitude at your own free will, and avoiding everything that comes with the real world, like a job, friends, school etc etc.