I led the development of a mobile-first payment application from the ground up, empowering merchants to efficiently track and process credit card transactions. I helped transition of our code base from AngularJS to Angular 10 and migrated from Bootstrap to Angular Material, ensuring a modern and scalable architecture. Through rigorous testing and optimization efforts, I successfully increased code coverage of the UI project to over 90%, guaranteeing robust functionality and reliability. Additionally, I played a key role in compliance efforts by creating ExpressJS and Laravel APIs to simulate Visa/Mastercard functionality, enabling our internal teams to meet stringent EU credit card regulation deadlines. In tandem, I maintained and expanded functionality within the production Laravel API, implementing new endpoints, database structures, and features to accommodate evolving business needs. To enhance data visualization and user insights, I integrated Google Charts and Pendo Analytics, further enriching the application's capabilities and user experience. Responsible for delivering a high-performance, compliant, and user-friendly payment solution to our clientele.