What is the correct expression when we want to say :
The Grade of someone is:
Engineer of Applied Sciences & Information Technology.
Engineer in Applied Sciences & Information Technology.
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You could use both variants. I'd also take into account both comments to your question - those two ways are fairly good to use. Although for the formal Degree one should use an expression from that Degree document (diploma) - like "Master of Engineering in Applied Sciences & Information Technology". Usually, degrees expressed like Master/Bachelor of Something in Something. But the best way is to quote directly from the Diploma. If it's from some other country, one should ask for the translation in his alma mater. They decide :)