You can use Citus, as others have mentioned, or something like BDR – but bear in mind that vanilla Postgres will happily do big pile of hot standby servers for

You can use Citus, as others have mentioned, or something like BDR – but bear in mind that vanilla Postgres will happily do big pile of hot standby servers for scaling reads, and will scale vertically very well. You might have a case in which you need something faster – I'd argue that there are still better solutions, but YMMV.