Most of the technical department offers study leaves and training programs for its employees. So yeah! You can keep up your study after joining the job but it would take time. As you join via SSC JE then you will have 1 year of probationary period. So within this period you wont be able to join your UG studies. Now as your probation gets over after that you have to compulsorily give e 2 year service. After this you can apply for study leave and if your seniors are impressed by your work or they feel you deserve they will sanction it. So in general you will be able to join the UG course after 3-5 years from the year of your joining.

I hope this helps. All the very best for your future endeavors!