A system and method for customizing communication processing within a communication platform that includes configuring a service handler, which comprises of at least setting execution code of the service handler; setting an association between the service handler and a communication event of the communication platform; detecting the occurrence of the communication event of a communication facilitated through the communication platform; invoking the service handler in response to the event, which comprises: executing the execution code in a serverless execution environment and generating a service handler response; and augmenting the communication in accordance with the service handler response.