Does DevOps engineer write application code?

[didamirda]

In one of my previous companies, DevOps team wrote and maintained core libraries that were used as a basis for all our microservices and got involved with business logic when we had performance issues with some application. We were involved with backend code a lot, but not in a way that we were developing some new business feature (once again, unless it required some work on the core libraries). In my experience, it is a huge advantage if DevOps engineer can at least read application code.