Update index.md

Author: Celiaioulain

content/join-us/2023-06-01-Engineer/index.md

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+# THIS POSITION HAS BEEN FILLED.  
+However, please feel free to send us your CV at [email protected], so we can contact you if an opportunity matching your profile becomes available.
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 # C++ expert engineer 👩‍💻🧑‍💻
 
 ## Contribution to the development of the Kokkos GPU computing library within the CExA “Moonshot” project