Update index.md

Author: Celiaioulain

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

@@ -13,7 +13,7 @@ links:
 
 ---
 
-# THIS POSITION HAS BEEN FILLED.  
+**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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