Where to buy a stack/bootstrap/scaffolding for a survey site

I am looking at hosting my own survey website. I am considering more of turn-key solutions instead of custom built by a freelancer, as this is like a proof-of-concept for a marketing idea.

• Admin site that I can post questions, looking at 100 or more questions, grouped by categories
• Client site that requires registration and login to answer the questions
• Simple backend to store the answers by users
• Whitelabel capabilities that I can use my own domain

I prefer self-hosted because the number of questions/surveys might be a lot and thus paid online survey is not cost effective.

I won't mind paying to host the whole solutions in AWS with S3/DynamoDB backed, for example.

Is there any marketplace that I can buy such solutions?

Thanks in advance!