Nicholas Buhagiar Email & Phone Number

- Construct ML models to flag Cash App Card transactions and customers predicted of engaging in fraudulent behaviour- Conduct AB tests to evaluate changes to Cash App Card risk controls- Collaborate with fraud SMEs to proactively review suspected emerging fraud patterns on the platform- Engineer features related to transaction statistics across Cash App cards, customers, merchants, and locales used across the org to enhance ML training and inference- Developed ML artifact tracking and feature selection capabilities for Cash App's in-house model training pipeline- Craft ETLs and dashboards to track, monitor, and present Cash App Card risk-related metrics to internal risk stakeholders

- Trained tree ensemble models on geospatial data to forecast maritime vessel movements- Spearheaded data analyses to assist product management and business development stakeholders in defining data service offerings and assessing external data provided by business partners- Led the formalisation of the data science practice within the engineering department and facilitated training sessions on using Docker, Python, and JupyterLab for data analysis- Designed interactive dashboards, enabling sales, operations, marketing, and investor relations teams to better understand and leverage in-house data capabilities

- Deployed tree ensemble models to forecast airport terminal traffic to address staff scheduling inefficiencies- Developed hierarchical clustering models for grouping telemetry readings used by oil & gas stakeholders, improving drilling efficiency, monitoring, and maintenance- Trained and deployed a convolutional neural network to identify a particular waveform reading during critical medical procedures- Designed agile dashboards and notebooks to synthesise key findings and present recommendations for a wide range of commercial stakeholders

Master Of Science (Msc), Computer Science

Thesis: Analysed online discussion forum comments to model interests and recommend discussions for individual users using the topic model.

Bachelor Of Science (Bsc), Physics

Studied the impact of information propagation on the topology of social networks using cloud computing