As a consultant you wouldn't be expected to do DevOps duties yourself. But
you should get familiar with some of the tools that DevOps people work with. It's likely that you might be called on to help develop provisioning support for the apps you are developing, so learning Puppet, Chef, and their friends would be a good idea.
And, while I don't myself consider continuous-integration systems such as
Jenkins to be DevOps, strictly speaking, that's another tool that it's good to know how to tweak so that when it does its thing, the results will be more DevOps-friendly.