Kafka Expert for kafka integration

We are using kafka pub sub architecture in our code. We have 3 data pipeline, 1st pipeline is we have to stream data from postgres sql to kafka. In second pipeline we are using kafka as a input in a python module. THe python module is having 3 seperate module which is running parallely and doing some calculation and return 3 seperate json. In 3rd pipeline we have to send the json output of the second pipeline to postgres sql in nested json(all three module json should be combined here).