Helping on patch review and development. Since 2012 I got involved in development of some cool features: - Support IF NOT EXISTS to CREATE {SCHEMA | INDEX | SEQUENCE | MATERIALIZED VIEW} and ALTER TABLE ADD COLUMN statements - Add DISCARD SEQUENCE command - Allow time delayed standbys and recovery - Add ALTER TABLE ... SET LOGGED/UNLOGGED command - Reduce lock levels for ALTER TABLE SET autovacuum storage options There are other patches and reviews according the link below: https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=47167b7907a802ed39b179c8780b76359468f076 I’m also maintain Brazilian mailing lists and the community organization in general, promoting Postgres and events like a big one called PGConf Brazil that is biggest Postgres event on South America.