genetic engineering of algae

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do you think scientists could make algae capable of breathing in whatever the atmosphere that shrouds Venus and belch out oxygen?

By algae I'm assuming you mean the eukaryotic algae. Bacteria/prokaryotes are a lot more versatile. There'd be a much better chance of finding an extremophile bacterial species that can withstand the over 400 degrees C temperature and lack of water.

Basically since algae has chlorophyll, it could use the CO2 in Venus's atmosphere to make oxygen, but its too hot. Venus is a runaway greenhouse effect planet.

Yes, it worked on Earth.

I expect some Hydrocarbons, so the makings are there for water and oxygen, but I would expect a few million years would be needed.

It's possible if the research was put into it, but if it's terraforming you're after, it'd take forever.