In this episode, I would be talking about domain driven design. There is always two types of engineers in a team. One who are core members and understand the domain lingua well and others who just care about feature completion. Of course the core members are the ones who are least replaceable and are important asset for a company. 

Understanding domain and talking and creating code and architecture that goes hand in hand with domain expert understanding is a big asset and is the topic of this episode and the book Domain Driven Design by Eric Evans. I would suggest reading that as well.