Dauphine (Master 203) is right up there with HEC, ESSEC, ESCP if you want a trading job in France. There is preference in financial engineering roles for people from the likes of Dauphine, ENSAE, Mines de Nancy over those from business schools.
For trading jobs in the UK, the HEC / ESSEC brand will probably get you further at a non-French bank, though there are invariably many people who start out on long-term internships from Dauphine at BNP, SG, Credit Agricole etc. who then transfer to London.