Developed the payments system for the world's largest micromobility company, including integrations with Stripe, Braintree, Adyen, and other PSPs. Designed and built innovative solutions within a Ruby on Rails monolith to save more than $10m annualized in payment fees, and increased topline net revenue by more than $20m by implementing new fraud detection and prevention systems. Contributed to IPO readiness, cross-company AI adoption, and tax compliance initiatives. Worked closely with local operations in most of Lime's 30+ operating countries, integrated with new local payment methods, and led engineering excellence in technical design, code reviews, and long-term vision.