They are also one of the most major contributors of CPython, which is the default implementation of Python. Especially in London they have a dedicated team, Fas

They are also one of the most major contributors of CPython, which is the default implementation of Python. Especially in London they have a dedicated team, Faster CPython team, which (unsurprisingly) concentrates on improving performance of CPython. The team contains big name like the creator of Python, Guido van Rossum.