Meta has been hiring. In 2021, the technology company let it be known that it wanted to hire 10,000 engineers across the European Union alone to work on augmented and virtual reality. One hedge fund technologist who heeded that call has now reappeared at his former employer. Bijan Treister spent over six years at hedge fund Millennium, where he was the New York-based head of infrastructure for WorldQuant until August 2021. He then left for Meta, where he was a New York-based senior engineer on the augmented reality platform.