As a cs grad, i would recommend you consider the other departments like infomation pc, digital hub and pc8. You will learn alot more there and apply your skills and knowledge better. Culture depends alot on your bosses but people are generally friendly and nice. If you hate your boss, you can easily flag to change your team or dept 24/7.

12 months base + 13th month + civil/public service bonus + perf bonus. why dont you apply for the internship to learn more?