During the last year or so I had to take the architectural ownership of an existing microservice architecture deployed on Azure. It was designed to serve as an integration platform between several backend systems, but evolved to become much more than that. As somebody with a lot of experience modernizing legacy code, I was surprised by many of its problems and how the team was suffering. In this talk, I like to share all the coding mistakes, design flaws, technical debt and pattern misuse I found, and how I addressed them gradually while training the team on the job