Is there a guarantee on the fix?

Yes. If the exact bug we fixed comes back within 14 days, we fix it again at no charge. Every fix ships with a regression check specifically so it can’t silently regress on your next deploy. If the original diagnosis turns out to be wrong, you don’t pay for the wrong fix, only for solving the real root cause. For ongoing peace of mind, an emergency retainer keeps a front-end engineer on call.