ISRO conduct exam for Recruitment of Engineer but last date of application form was 28-02-2012 .so currently there is no opening for engineer in ISRO.

And here is the detail of last recruitment:
ISRO (Indian Space Research Organisation) - Scientist
Organisation : ISRO (Indian Space Research Organisation)
Post(s) : Scientist / Engineer’SC’ (Electronics) Scientist / Engineer’SC’ (Mechanical)
Eligibility : BE / B.Tech
Age : 35 years for as on date 28.02.2012 (40 years for SC/ST candidates, 38 years for OBC candidates)
Last Date to apply: 28.02.2012.