Staff Software Engineer, Frontend (React-Native)

As Marqeta's Staff Software Engineer, Frontend with strong expertise in React Native you will provide technical leadership in building our UX Toolkit (Web/Native) at Marqeta. This is a newly formed area of focus, and we need a technical leader with deep experience in building cross-platform mobile and web applications from the ground up. Partner with product, design, and engineering leadership to shape and deliver innovative cardholder experiences across web and mobile platforms, aligning technical strategy with business goals. Lead the design and development of React Native SDKs and applications, establishing architectural patterns that enable scalability, modularity, and cross-platform consistency. Architect reusable and extensible React Native components that adhere to modern UI/UX patterns, accessibility standards, and internal design systems. Drive mobile performance optimization strategies, including lazy loading, rendering optimizations, and bundle size reduction, to ensure fast, responsive experiences. Contribute hands-on to complex front-end systems using React Native, TypeScript, and web technologies, while fostering engineering excellence through mentorship and code quality initiatives. Define technical roadmaps and author detailed design documents that align with long-term platform strategy, balancing velocity with maintainability. Lead engineering discussions, guide decision-making across teams, and champion best practices for mobile and web development to improve developer velocity and user experience.