Thank you!

I work with a team of 6 developers (split between iOS and Android). Since it is easier for 1 person to adapt instead of 6, I try to deliver specs in a way that works for them. Most of our design work is component-based at this point, so I am handing off specs for 1x atomic pieces, not necessarily entire screens. I make the specs in Sketch and use Sketch Measure or a key (agreed upon by the dev team) to denote spacing.

Sometimes I add notes like "60%" for the width of something, since mobile screen sizes aren't absolute. From there, I put the specs into a Google Slides presentation that has all the other specs, notes, mockups, etc for our current release. I link that presentation into JIRA tickets. That way if things change, I can update the spec in one place (instead of digging through tickets). Added bonus: you get a slide deck of everything you changed during each release.

Anything that gets used consistently and often is then moved to an overall style-guide that is hosted on Frontify. In theory, that is where the team would look for longstanding documentation. In reality, a lot of them have printed versions of specs that get referenced often (EX: a breakdown of our text styles).

1:6 (half iOS, half Android).