Mike North is a US senior engineer (formerly at LinkedIn and Stripe) and one of the most-watched Frontend Masters instructors on the TypeScript track. His TypeScript material is widely cited for going deeper into the type system than most TypeScript tutorials — particularly on the patterns for modeling complex domains and managing TypeScript across monorepo codebases.
His CourseFlix listing carries two Mike North courses: Model Complex Domains with TypeScript and TypeScript Monorepos — Architect Maintainable Projects. Together the courses cover the senior-engineering side of TypeScript work that matters most in real production codebases.
Material is paid; Mike's courses are primarily distributed through Frontend Masters on the original platform. Courses are aimed at intermediate-and-up TypeScript developers.