Yup! All of our engineering teams are fully remote and any candidate based in the US can apply! In some hub cities (e.g. New York, Washington DC) there are some employees who meet up at WeWork offices a couple of days a week but the majority of employees work from home all the time.
No, unfortunately remote from India is not an option for these roles.
However we do have Engineering Manager and Software Engineer II roles open to India based engineers. They're also listed here: https://www.arcadia.com/careers
says "Arcadia is open to fully remote candidates and employees have access to co-working spaces."
though I had to ctrl+f to find it