It is not easy to be a Site Reliability Engineer (SRE). Monitoring system infrastructure and aligning it with the key reliability metrics is quite a daunting task. Whereas, a software engineer's job is to deliver high-quality software.
Relationships between software engineers and site reliability engineers can sometimes be tricky. To begin with, developers are generally assigned to write code that goes into production. Then, there are SREs who are responsible for improving the product's reliability and performance.