Jimmy Mei

About Jimmy Mei

Software engineer experienced in building and scaling full-stack applications.

Experience

1. Senior Software Engineer

   Mastercard

   Jan 2021 — Present · NY, US

   Developed core features for the Mastercard Developers Portal and internal Admin Tool, elevating platform capabilities, enhancing user experience and supporting over 80 API services Redesigned the platform’s user interface, applying modern design standards and creating over 35 global components with Bootstrap and Storybook to uphold consistency and improve accessibility across the platform Spearheaded the implementation of Ironclad into the portal, upgrading the management of legal agreements and ensuring 100% compliance with legal standards, while establishing a centralized storage for contracts and consent status Incorporated unit tests using React Testing Library, upholding 80% test coverage across the entire codebase, passing SonarQube quality gates and reducing vulnerabilities and technical debt, resulting in improved code quality Refactored significant portions of the frontend codebase, embracing modern React practices and industry standards to improve maintainability, scalability and reduce total test runtime by 5% Executed Jenkins to run unit and integration tests via Bitbucket webhooks to reduce bugs and prevent failing builds from merging Authored cron jobs to automatically delete thousands of expiring keys and user accounts created by the QA team during automated testing, streamlining the testing process and enhancing efficiency Designated lead in frontend bug management for five repositories, resolving defects and issues reported by service owners, quality assurance and product team in a timely manner to ensure user satisfaction and platform stability Integrated feature flags using FF4J to support continuous feature delivery and role specific rollouts, enabling a flexible and controlled deployment of new functionalities while eliminating the dependency for feature branches and reducing development time