Aaron Bird

Built and owned a mobile expense approval workflow in React Native and Expo, enabling field managers to review receipts, approve transactions, and submit decisions back to the central ledger via REST APIs. Led mobile client architecture, defining component libraries, navigation patterns, and state management. Designed PostgreSQL schemas for user profiles and content metadata, wrote complex search queries, managed transaction isolation, and optimized indexing. Led corporate card issuance service development in Go and PostgreSQL, including account creation, limit configuration, and transaction routing for enterprise clients. Optimized high-volume transaction log performance with table partitioning and composite indexes. Designed a real-time fraud detection pipeline using Node.js, Redis, and Express to flag suspicious spending prior to payment network authorization. Established code review standards and CI/CD pipelines with mandatory unit tests and static analysis gates to reduce producti

Built and maintained mobile client features using React Native and Expo, including user authentication flows, media playback controls, and profile management screens. Implemented TDD-focused testing practices with unit and integration tests using Jest and Mockito, improving reliability of authentication and other core business logic. Created RESTful Node.js/Express endpoints for video metadata and playlist information for concurrent multi-device requests. Configured Expo build environments and over-the-air update workflows to ensure consistent releases. Delivered backend services with Node.js and Express, collaborated with product managers on a recommendation engine, and fixed live stream buffering defects by analyzing server logs and adjusting timeout parameters.