I'd think that Database Developers would be required to be in a separate group from DBAs, especially if you're in a public company, as a separation of duties thing.  I...

I've found that a lot of the problems that are "database" issues turn out to be queries that have either incomplete joins (for tables that have multi-column primary keys) or...

I also notice that it has a degree of parallelism of 16 which seems high.  Guidance from Microsoft suggests this probably shouldn't be more than 8:
https://support.microsoft.com/en-us/help/2806535/recommendations-and-guidelines-for-the-max-degree-of-parallelism-confi

residual IO means that the database engine did a lot more reads than necessary, for example:
Tax_Name_To_DDA, which is listed as a HEAP, has 4 full table scans on it. ...

a couple of initial comments based on the query plan:
-  there are a number of places that the actual number of rows far exceeds the estimated number of rows,...

I tend to not think of the to do items so much as a "list".  I see them as a stack of queues.  If something comes in at a priority that I...

have you tried just scripting out the login creation?
CREATE LOGIN [DomainB\ADaccountName] FROM WINDOWS;

If there were still computers, I'd probably still be a developer then.  If we are asking the question assuming non-computer jobs, I'd probably say some kind of woodworking.