Led migration of a critical authorisation microservice from AWS DynamoDB to PostgreSQL, enabling a later AWS → GCP move that cut infrastructure costs significantly.

Participated in the analysis and integration of Sift for fraudulent transaction detection, significantly reducing the chargeback rate on Udemy's B2C payment flows.

MSc thesis at Bilkent University — accelerating the MTTKRP tensor operation used in tensor factorisation using High Level Synthesis (HLS) targeting FPGAs.

Implemented pricing logic enabling Udemy to accurately charge the correct price per course per market, aligning revenue with customer value.

Built the payments side of Udemy's subscription marketplace from requirements through to launch and monitoring.