ThatScalaGuy.
I’m Sven Herrmann — a freelance engineer who believes software should be correct by construction. I wear three hats: a Scala evangelist building functional backends, a data scientist turning data into decisions, and a requirements engineer who shapes fuzzy ideas into clear specs. Mostly Scala 3 and the Typelevel stack, with Python, Go and Gleam where they fit.
Three hats, one engineer
Scala Evangelist
Functional backends on Scala 3 and the Typelevel stack — event-sourced, typed, correct by construction. And I help teams learn to build this way.
Data Scientist
Analytics, machine learning and fast-data pipelines on Spark and the Scala/Python ecosystem — models and insight that reach production, not just notebooks.
Requirements Engineer
Turning fuzzy ideas into tangible, well-defined requirements for web apps, real-time systems and data platforms. CPRE Foundation Level.