In this talk I will share my experience migrating completely an entire platform of REST APIs of a phone switchboard system that serve thousands of customers in production. The migration is from using Restify to the adoption of a more efficient and performant Fastify library. We will consider the pros and cons of both solutions and how the performance has been increased with the simplicity of the code. This story is real and is about a Computer Telephony Integration system (100% Node.js) that interacts with an Asterisk VoIP PBX switchboard which serves thousands of customers in daily real-time audio and video communications. We sill se how the micro service architecture allow us to achieve modular and independent components isolated from each other and which can scale horizontally.