BillingPlatform is seeking a Frontend Developer to build and optimize UI widgets and components, partnering with designers and backend engineers to deliver a smooth user experience. - Develop UI components using a proprietary framework plus HTML, CSS, and JavaScript - Build and maintain widgets for customer implementations - Optimize UI performance across devices and browsers - Collaborate with designers and backend developers on scalable solutions - Write clean, well-documented, testable code following best practices - Maintain stability of existing functionality through structured development and testing - Participate in code reviews and provide constructive feedback