Hello aspirant,

GAIL is definitely a good company for cs engineers regarding their career.

Yes there is an opening in GAIL for cs engineers through gate

To get into psu's one needs to get a really good rank in gate

Hope this helps you

All the best!

You can check the below link to know about the same- http://www.engineering.careers360.com/news/gail-recruit-executive-trainees-through-gate-2017-213925