See in most private companies, usually the jobs are contract basis so the conception of the permanent jobs are now quite low. Now the process is that, depending on your performance, the companies offers you to increase the tenure and like that. So if you go for a Diploma course then yeah! you have good scope in the jobs field and you can land some permanent jobs as well.

Now if you are studying Diploma subjects such as Civil Engineering, Mechanical Engineering, Electrical Engineering etc then you can also apply for government technical jobs such as SSC JE or RRB JE which can also give you permanent central government jobs.

To know more about SSC JE visit the link below:

https://competition.careers360.com/exams/ssc-je

To know more about RRB JE visit the link below:

https://competition.careers360.com/exams/rrb-je-recruitment

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