Help Me…….
Please I Need Some Clarification
You can use any language that is capable of doing a call to the endpoint and returning s data string
The general description is here How to get the PubAPI data
I use VBA and a bit of Python
https://www.reddit.com/r/chess/comments/111940a/hi_reddit_im_josh_levine_cto_at_chesscom_ama_10am/
This is older information, and some things have likely changed, but if your question is about what the site is using internally, it should be close.

Looking at open jobs may also give some more current information on what skill sets the site is looking for.
Hello Chess.com Team,
I am a C/C++ With 2 months experience. I need some Clarification on What language you all are using. It doesn’t seem to be C/C++.
I am okay with Java For Backend Support But it Isn’t a language I am familiar with. It seems to be something like Python Or JS (Javascript). Please Respond On what language Y’all are using And using that Info I’ll try my level Best on Trying to help with Certain Issues. Awaiting Your response, please DM Me.
Thank you
IRL_Pwned😁
I using FE JavaScript
Hello Chess.com Team,
I am a C/C++ With 2 months experience. I need some Clarification on What language you all are using. It doesn’t seem to be C/C++.
I am okay with Java For Backend Support But it Isn’t a language I am familiar with. It seems to be something like Python Or JS (Javascript). Please Respond On what language Y’all are using And using that Info I’ll try my level Best on Trying to help with Certain Issues. Awaiting Your response, please DM Me.
Thank you
IRL_Pwned😁