I would hurl myself toward getting the following working first:
* User signup (default to user)
* Profile setup (photo, etc).
* Add Stripe information
* Make it easy to share the link to my profile
* Enable Expert-mode, to answer phone calls
* Enable Twilio for calls
* Set Hourly-rate for calls
* Build/program API to handle conference calls etc
* Connect to LinkedIn / Facebook / Twitter for 'verification'

I wouldn't spend time with any Javascript frameworks etc at first. Just make it usable and not a pain for people to get in and make a phone call, or edit their profile.

Other than that, Clarity is very well built as it is. I'm sure you're trying to build this for a specific business.