About Flatiron Software Co. Flatiron is a fully remote, US-based software company delivering high-impact, modern digital experiences. We work with mission-driven organizations, media groups, and product teams to build scalable, accessible, and performant web platforms. We're currently seeking full-stack developers to join our engineering team, with a strong emphasis on deep WordPress and modern JavaScript experience. About the Role We’re looking for a highly skilled Senior WordPress Developer to join our global engineering team. This position focuses on backend development — building and optimizing custom WordPress plugins, APIs, and integrations for large-scale, high-performance websites. The ideal candidate has deep knowledge of WordPress internals, experience working with enterprise clients, and a strong understanding of scalable, maintainable code. Responsibilities Integrate WordPress with subscription, paywall, and circulation systems. Build and maintain API integrations between WordPress and external platforms. Ensure reliable synchronization of user data, subscriptions, billing, and content access. Design backend services and middleware to support multi-system communication. Work closely with product and data teams to support subscription and audience workflows. Troubleshoot and optimize data flows across systems for performance and reliability. Develop scalable solutions for high-traffic media platforms. Minimum Qualifications 5+ years of WordPress development experience with backend focus. Strong experience with API integrations and distributed systems. Experience with platforms such as Darwin CX and Naviga NCS Circ. Experience with subscription/paywall systems and audience management platforms. Proficiency in PHP, MySQL, JavaScrip