Put two people on call, not one
Reptile emergencies punish hesitation, because few general pet sitters can read the signs and even fewer know an exotics vet. While you plan the trip, recruit a primary keeper, ideally someone who already keeps reptiles, and a backup who can step in if the first falls ill or has their own emergency. Both need a house key, the alarm routine, and a clear understanding that they are agreeing to vet runs as well as feeding. Put the arrangement in writing, with dates, so nobody's commitment rests on a half-remembered conversation.
Walk every enclosure in person
A video call cannot replace standing in front of the glass. Have your keeper open every vivarium, run the sprayer, check the thermostat readouts and handle the feeding routine with you watching, species by species. Show them where the spare bulbs, fuses, feeder insects and cleaning kit live, and which quirks are normal: the snake that refuses food in shed, the gecko that hides for days. The quirks list matters, because it stops a worried keeper treating normal behaviour as an emergency, and stops a real change being waved away as just how he is.
Write the emergency ladder
Write down, in plain language, the signs that mean act now: a burn or a prolapse, clicking or open-mouth breathing, a limb gone limp or swollen, an animal found soaking for hours or collapsed away from its usual spots. Beside each, write the action, call the exotics vet first, then you, and tape the sheet where the keeper will actually see it, on the vivarium stand, not in a drawer. Add the vet's address and out-of-hours arrangement, because the nearest practice is rarely the one that treats reptiles.
Money and permission, settled early
Decide the money before anyone needs it. Leave a card, cash or a pre-paid arrangement the keeper can use at the vet without fronting their own money, and state plainly that they have your permission to authorise urgent treatment up to the level you are comfortable with. Vets may be unable to treat an animal whose owner cannot be reached and whose bill nobody can cover, and a keeper armed with written permission and payment removes both obstacles in the middle of your night.
Staying reachable from abroad
Agree how contact works across the time difference: a messaging thread the keeper updates after every visit, a fixed daily check-in time, and a rule that emergencies are phoned, not messaged. Photograph each enclosure before you leave so the keeper's does-this-look-right picture can be compared against the setup as you left it. When the keeper's access needs to end cleanly the day you return, KinsLe's Care Pass hands them your reptiles' routines and emergency details for the trip only: clear while you're away, closed when you're home.