Lessonly transitioned from using Heroku and Jenkins-Spinnaker pipelines to Harness, significantly improving operational efficiency by reducing service onboarding time from a week to minutes and eliminating extensive maintenance work. Initially, Heroku's lack of infrastructure flexibility and increasing costs prompted the move to AWS, where attempts to use Jenkins and Spinnaker-based pipelines proved inadequate due to their complexity and lack of essential features like RBAC and audit trails. The switch to Harness empowered developers with self-service deployment, advanced role-based access control, and audit capabilities, allowing them to manage their services more effectively without disrupting the developer experience. This transition enabled site reliability engineers like Stephen Gregory and Tyler Henrichs to focus more on application development rather than deployment maintenance, all while ensuring the shift went unnoticed by developers, highlighting the seamless integration of the new system.