Freek van Keulen is a software engineer, trainer, and author focused on helping development teams ship reliable systems. He runs the Rust Expertise Center, where he develops professional Rust training and certification material for engineers moving from mainstream languages into Rust. His work emphasizes production-grade practices, clear architecture, and the practical mental models that make Rust approachable without compromising on correctness.

When he is not writing or teaching, Freek builds real-world Rust services and tooling, translating day-to-day engineering problems into examples that readers can apply immediately.