Polars, the Amsterdam-based company behind the popular open source project of the same name, has raised €18 million (about $21 million) in a Series A round led by Accel, with participation from Bain Capital Partners and angel investors. But while raising this kind of money is the dream of many developers, its creator Ritchie Vink didn’t set out to do so. It all started as a pet project during COVID. Frustrated with the limitations of Pandas, a tool for organizing and working with data tables, Vi...