How is this grammar works?
In resume:
I lead a group of three developers and ...
→ Led group of three developers and ...
Is this a past participle or Ellipsis (it just omits subject)?
Is it just omits subject?
I was led group of three developers and ...
becomes
Led group of three developers and ...
And a example likes this in Google Play:
Added reading progress bar
Is this a telegram style?
I was led group of three developers and ...becomes →Led group of three developers and ...;We were added reading progress barbecomes →Added reading progress bar? – user2959760 Oct 24 '15 at 14:53