At Visa, I build backend services for payment authorization and transaction routing, using Python and PostgreSQL to keep card activity traceable. I added validation and retry logic to merchant-facing APIs, reducing payment request failures by 18% during peak processing windows.
I improved reconciliation jobs at Visa and refined transaction reporting queries, helping operations teams handle exceptions sooner and cutting slow report runs from minutes to under 30 seconds. I also worked on fraud-review endpoints backed by Apache Kafka event streams.
At eBay, I developed marketplace workflows and improved REST endpoints, trimming average response time by 25% on heavily used purchase paths. Earlier, at Philips, I built backend services for clinical device data capture and helped reduce duplicate clinical records by 12%.
