The AMLab group at the University of Amsterdam is looking for two motivated PhD candidates interested in AI4Fintech in the domain of causal machine learning and reinforcement learning. This project is in collaboration with Adyen. One PhD student will focus on causal machine learning in the context of financial transaction data, working on learning causal drivers of user behaviour through reusing existing A/B test results and designing new sample efficient experiments. Another student will work on novel reinforcement learning techniques to improve decision making about transactions, dealing with a complex, combinatorial action space, and off-policy learning and evaluation.