.net Core 2.2 version with n-tier architecture is used in this software.
To store the data I used Static objects, and to avoid any conflicts with the data add or update processes
I used 'async lock' method. Additionally, I included a test project to facilitate testing process.

Service layer in this application is designed in a way to be able to serve to other applications in addition to API.
Therefore, it can be easily applied to other projects as well.

API Support :

• Creating a survey
• Taking a Survey
• Getting Results of a Survey

How to run it ?

• First of, download .net core 2.2
• Download this repository
• Navigate to the folder where you downloaded the code.
• Finally, type dotnet run command.

In order to keep the collected data (survey content, questions and answers to the survey) persistently I would use a database such as PostgreSQL.
In case of extensive use of the system, to improve the performance of the database I would use a Cache system such as Redis.
Also, I would use an Admin web application for the management of the survey.