[0] https://www.faa.gov/other_visit/aviation_industry/designees_...
> 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.
If you are building a webapp, it's probably fine that you haven't taken an ethical code, been legally qualified to write the code, etc, but those "engineers" that write code that keeps airplanes in the air or driverless cars on the road have, in my opinion, crossed that line into actual engineering work and as such should hold themselves to the same standards as other professionals in the space.
In the case of MCAS there would be a codebase with a signed commit by the responsible engineer, his or her name would be right there in bold when the first version was shipped and when hack upon hack was piled on. Of course this is no panacea but this has to be the way forward as software continues to extend it's reach into mission critical roles in our lives, right?