After 10th or SSC, you should do three years Diploma in Engineering. It can be from any polytechnic college, recognized by state technical board or UGC recognized University.
After completion of course apply for jobs with Govt Departments like Municipality, PWD, Railways, Electricity or other departments. You can also apply with Engineering Industries or Companies in Engineering.
J.E. are required in every specialization like Computers, Chemical, Automobile, Electronics etc. In govt departments most of such job opportunities exist in Civil, Electrical and Mechanical Engineering.
Technicians, who have done 2 years ITI course, can do DIPLOMA in Engineering and apply for promotion to J.E.