Hi Aspirants,

To get into an old iit as an assistant professor it depends on several factors like Education background,research experience,teaching skill etc.There is a high probability which older iit's insist is to intake assistant professors whose education background is Phd or equvalent qualification from top international Universities like oxford,New york University,Massachusetts,Harvard etc.A good range of publications in international outlets is necessary for applying for the job.To become assistant professor they also the check the clarity of your knowledge and understandings and also your teaching skills.

Hope it helps!!

All the best