Karsten is an excellent colleague. He is able to prototype flows, and communicate the design thinking behind them effortlessly. His ability to absorb feedback and iterate is incredibly fast and the end result is always high quality.
Karsten is technically very strong. After a brief afternoon of onboarding, he was able to deliver production-ready React code near immediately. He even used map-reduce in elements within the components. I’ve never even seen a designer use map-reduce!