Fastest is a 30-minute call. If you'd rather write first, that works too, reply within 24 hours on business days.
30 minutes. You tell me where your engineering is stuck, I tell you whether a POC is the right entry. Or whether something else makes more sense.
A short message is enough. Reply within 24 hours on business days.
Then write it the way you'd tell a colleague:
„We have a problem with X, I think we lose Y hours a month."
That's enough to start.