It won’t! They’ll probably offer to let you try a lot of things but if you just tell them you can’t have caffeine, they’ll understand :)

There are plenty of partners that don’t drink coffee or caffeine! As long as you can do the job no one cares!

As someone who has (not life threatening) heart issues but is dumb enough to drink caffeine... and get palpitations...
here’s when I *do not* get issues.
-tastings. You have a tiny cup and barely drink any. It’s about equivalent to a decaf. Two mouthfuls max.
-decaf coffee/espresso.
-passion tea or a tall of a tea (w water or lemonade).
Of course if your issues are more serious don’t risk it. You can know product without trying it, and most have a decaf option so you can always do that!
Just do what you can, it’s more than enough!

get yo self steamers. and creme fraps

It should be an issue, but Starbucks stopped caring about everything but money a long time ago so it def won't matter at all.