[zwolbers]

Take this post with a grain of salt - I've never worked directly with a DER. Hopefully others can correct me where needed.

> So these software engineers would be referred to as Systems and Equipment Engineering leads in this case?

I suppose you could say so, however my understanding has always been that DERs are highly specialized. "Systems and Equipment" covers a wide variety of aircraft components; I would think that's more of a category than a title. As a software engineer, on a project level, we've always simply referred to them as "The DER".

While DERs certainly have a background in engineering, they don't actively help create the product - I wouldn't classify them as a "Engineering Lead". When it comes to designing something, its safety is derived from different internal groups with different goals continuously evaluating each other's work. At each level, everyone signs off on the work they performed or reviewed. As I understand it, the DER oversees all of this, and on a technical level, is ultimately responsible for convincing the FAA everything is safe. On the software side of things, whenever there's a release, a DER has to sign off on it.