Tjeerd in 't Veen is a Dutch iOS engineer (formerly at Booking.com and WeTransfer) and the author of Mobile System Design — one of the more rigorous practitioner-focused books on the architectural side of mobile-application engineering.
His CourseFlix listing carries Mobile System Design — a structured treatment of the mobile-system-design discipline: the architectural patterns underneath production iOS and Android applications, the offline-first patterns, sync strategies, and the engineering decisions that separate scaled mobile codebases from toy apps.
Material is paid and aimed at senior mobile engineers responsible for architectural decisions on production mobile apps. For broader content, see CourseFlix's Swift and System Design & Architecture category pages.