Nope, it's Hack
Meta uses both in limited ways. Not prominently. Maybe around 5-7 place languages, i.e. don't expect to use either.
It's assembly
Yes. There are some systems written on them
Meta uses Java for Android work and C# for some Reality Labs (Horizon) work. Other languages I’ve commonly seen are: Hack/PHP (Web) C++ (back end) Python (ML teams plus varying other use cases) ReactJS (front end)
That is strange Meta being such a big company not using Java
C++ and Php/hack are big
What do u exactly mean by php/hack
Meta also uses Java in data infra
Is that data engineering or infrastructure code
Infrastructure code, they develop the data warehouse and tools for querying it
That does not sound very exciting :(
Who tf uses C#
Barely even Microsoft 😂
C# is actually a pretty solid and fast language.