Quant trading at a proprietary trading firm, quant hedge funds, sales&trading/structuring at an investment bank, investment banking (especially covering tech companies), equity research (again, covering tech companies), quant research, asset management etc..
Most of the IBs recruit via the internship --(convert)--> grad job offer schedule, but I think you'd be alright applying for prop shops/asset management firms in final year, not so much with the i-banks..
Could also just apply to normal finance grad schemes, i.e. the support function in large companies.
Basically, most finance schemes are pretty open to whichever degree you do (granted competition is fierce so you do need to have a lot of interest in the area) and some (i.e. prop shops, derivatives trading desks at banks) will value your CS knowledge very highly.
Worth a shot if you have genuine interest - given the number of firms out there you'll have some success if you prepare thoroughly for the application process which can be immensely difficult (especially at the prop shops where they will GRILL you on mental maths + probability).
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