Can a CGPA of 7 fetch a good job (Tier-1 or Tier-2) for a CS student at PES University?

Yes, Only if you’re good at programming and computer science fundamentals. It’s better to maintain above 8. Few companies keep cutoff above 8. But, just maintaining good GPA and not building your skills will not help you to grab good tier-1 offer. I know some people who had good GPA failed to get tier-1 companies. I graduated in 2018(CSE), had GPA of around 7.5 and I could managed to get 17 lakh (Base) package.