Running total with two pertinent Date columns

[kbarb85]

Hello all,
I believe I need DAX measure and I'm not finding what I need on the google machine. It's also possible I found what I need but did not comprehend it.
First of all, I'm using Excel (PQ & PPivot).

I have two tables. Here's the first:

Note each employee can have multiple positions, each with a pos start and pos end (pos end = blank means the employee currently holds the position). Each position has an FTE allocation.
In the linked file (see below), this table is loaded into Power Query as Connection Only and also loaded to data model.

I also have a date table:

Nothing too exciting. Just one column of continuous dates. This table is also loaded into PQ as Connection Only and also loaded to the data model.

I have not created any relationships or measures.

Okay, finally to the end goal.
I'd like my Users to filter by employee and get a line chart that shows the running total of FTE for all dates in the Date table.

So, if we take Kathy from the FTE table above, the chart would look something like this:

I think the tricky part is that the measure will have to "see" the pos start and pos end date. If a position end date exists, then the running total omits the FTE for that position as it iterates onward in time.

Here is a link the dummy file. Please feel free to make a copy and/or edit.

thank you in advance,
- Kurt

 

[kbarb85]

Solution here.

DAX Measure:

Measure =
SUMX (
FILTER (
FTE,
FTE[Pos Start] <= MAX ( 'Calendar'[Date] )
&& (
FTE[Pos End] >= MAX ( 'Calendar'[Date] )
|| ISBLANK ( FTE[Pos End] )
)
),
FTE[FTE]
)