https://draftgain.herokuapp.com/

• Full functionality of authentication system like email confirmation and so on (thanks Devise gem)
• User Roles
• Company owner can create companies, affiliates (for that company), and clients (which are customer for concrete company)
• Any client can become high-grade user; if such user exists (in other company) they merge

• Courses with dynamic fields
• Tariffs
• Subscriptions
• Elastic Search or Sphinx

• /companies - list of companies of current user
• /companies/1/affiliates - list of affiliates each of which belongs to company with id 1
• /companies/1/clients - similar to route above but for clients

• Postgres
• MySQL (at risk of being unsupported)