Valerii Babushkin is a Russian-British data scientist (formerly at Yandex, X5 Retail Group, and Bolt) and the co-author of Machine Learning System Design — one of the more rigorous practitioner-focused books on the engineering discipline of ML systems at scale.
His CourseFlix listing carries Machine Learning System Design. Material is paid and aimed at ML engineers preparing for senior-level system-design interviews focused on ML / data systems specifically.