Look for an experienced python | Blockchain developer to build small feature

We are ScalaMed ([login to view URL]), a digital prescription service built on blockchain. Our apps are built on react native & node.js & react.js & our blockchain ethereum crypto service is built on django/python. We are a 3 sided with 3 user types: 1. Pharmacists - web app 2. HCP (Health care provider) e.g Doctors - web app 3. Patients. - mobile app Problem: Our system is designed to allow one user type (Pharmacy, HCP & patient) per email - meaning if a pharmacy or HCP user type sign up as a patient with an identical email address - the system will flag an error. "This email has already been used". Solution/Spec: 1. On patient sign up, we require a check in Auth Service to see if that email is associated with a HCP or Pharmacy user type and put a specified error message on the UI (toast message) "This email is associated with a HCP or Pharmacy account, please use another email address" 2. On HCP sign up, we require a check in Auth Service to if that email is associated with a Patient or HCP user type and put a specified error message on the UI (NotificationAlert) "This email is associated with a Patient or Pharmacy account, please use another email address" 3. On Pharmacy sign up, we require a check in Auth Service to see if that email is associated with a with a HCP or Patient and put a specified error message on the UI (NotificationAlert) "This email is associated with a HCP or Pharmacy account, please use another email address" We are looking for an experienced & honest developer who can liaise with our development team whom we can work with in the future. We ideally want someone who has experience with blockchain implementation as down the track there will be blockchain features being implemented. An NDA will be required before work [login to view URL] price also includes bug fixing until feature is properly met under QA