Hello.
I can build the system for you.
I have done multiple jobs with MEAN Stack, MongoDB, React.js Framework, Software Architecture, Software Development which are the skills required to get this job done.
I have worked on several similar projects with this project.
I will get this project(SaaS Product Development - A product for companies to send NPS/CSAT surveys to their customers )) done with complete attention to detail.
I can do this within your budget too £3000 - £5000 GBP
Let's start the chat so we can discuss this job more in detail.
Best regards.