That's an interesting proposition...writing a synopsis in the first person would be confrontational and attention-grabbing. But, it would also feel wrong, as a synopsis isn't narration, it's a description or summary—which requires the stance of a third person.
The standard is to write a synopsis in third person present tense, as @Jackson Banks has indicated, no matter what POV your book is written in. Certainly you can experiment, but bear in mind it likely won't make a difference. A synopsis is only a piece of data. It's not meant to entice or sell the work. It's meant to show an agent or editor you have a cohesive story that has a beginning, a middle, and an end that resolves all major arcs.
A full synopsis should be, as mentioned, third person present tense, clear and simple, plainly factual. Don't hide anything, tell the whole story; secrets, surprises, reveals and all.
Now there are some who would say, don't give it all away in the synopsis. But then what you are giving them is just a taster. The purpose of a full synopsis is to demonstrate to the publisher/agent that you have the whole story plotted out and that it all hangs together without them having to read the whole MS.