Maciej Fijałkowski is a core developer of the PyPy project. He started contributing to it with the help of the Google Summer of Code Project in 2005, when he developed the Javascript backend. Since then, he has worked on the core of PyPy, including ctypes, the Just-In-Time compiler, garbage collectors and more.

At present he is employed by SKA South Africa to build infrastructure for MeerKAT, a very large radio telescope under construction in the karoo desert. The infrastructure is largely python-based and employs Twisted and PyPy among other technologies.