this context?
                  
                  
                
Db developer
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                          Jan
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                  So a developer that builds server-side application code, or someone who actually contributes to building the database server?
 Jan
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                          Jan
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                  There is no certification for that. You will need to engage in the hackers list. Your “certification” will be the fact that your ideas get traction and adoption.
Thanks for replying me and really appreciated,how can I engage to hackers list.
It's an email list, please look at the wiki page https://wiki.postgresql.org/wiki/Mailing_Lists Code is handled during CommitFests, details are here https://wiki.postgresql.org/wiki/CommitFest
Thanks a lot Janine
 Jan
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                          Jan
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                  https://www.postgresql.org/list/https://www.postgresql.org/list/pgsql-hackers/
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