I have large experience building web UI with jQuery and Bootstrap (20+ projects), and good experience in PHP (my main backend development language is nodejs though), I consider this backend language to be the easiest and got really familiar with it in college.
Im also used to work using git and agile development techniques, so our remote work can be smooth. I can help with arquitecture and production related matters if you require it, like pagespeed, scalability, caching and real time functionality e.g
To be honest I haven’t received bitcoin or eth payments in the past, still I’m really used to third party API/SDK integration, like Stripe, PayPal and Facebook in e-commerce or payment-abled sites that I’ve developed in the past, so I don’t think this should be any hassle.
Thanks for your attention, hope you pick me :)