Hello.
I read through your project description and I understand you need a script that autogenerate referral codes.
Am a web and mobile app designer and developer. I design UI and UX with great consideration to pyschology and sociology. Have been doing this for years at least 6. My stack include PHP,Python, JAVA JavaScript, CSS3 SASS.
You can chat me up for better details on the project..
It will be a privilege to work with you.
Thanks.